race fuel in a stock bike.

GeorgiePorgie 3/23/2019 12:08am
3/23/2019 12:08am
Aren’t you guys out of piss yet ?!
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cody41
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cody41 3/23/2019 4:48am
3/23/2019 4:48am
mxb2 wrote:
Anything pump isnt consistent. , Regular, cam2, vp. Its still from.a pump.
I have running premium pump fuel in every four stroke I’ve had and run cam2 pump race fuel in my smokers. I am A class speed and have let my fuel sit for months. Never once had a problem with pump fuel.
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smoothies862 3/23/2019 5:18am
3/23/2019 5:18am
I honestly thought "why in the world is there 6 pages for a fuel thread?". den I membered where I was.
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mxb2
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mxb2 3/23/2019 6:46am
3/23/2019 6:46am
mxb2 wrote:
Anything pump isnt consistent. , Regular, cam2, vp. Its still from.a pump.
cody41 wrote:
I have running premium pump fuel in every four stroke I’ve had and run cam2 pump race fuel in my smokers. I am A class speed...
I have running premium pump fuel in every four stroke I’ve had and run cam2 pump race fuel in my smokers. I am A class speed and have let my fuel sit for months. Never once had a problem with pump fuel.
Not saying its all bad, but pump fuel in my area sucks. Good fuel is peace of mind to me.my bikes are mapped with aftermarket exhausts. Spending $9k on a bike. Another $100 doesnt matter. People spend that in beer and pizza on a weekend.
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The Shop

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Keating
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Keating 2/21/2020 8:18pm
2/21/2020 8:18pm
wolf918 wrote:
If I push hard, it takes me 6hrs to mow my yard on my rider. I put my earbuds in and rock out to Metallica all...
If I push hard, it takes me 6hrs to mow my yard on my rider. I put my earbuds in and rock out to Metallica all while smelling the sweet smell of 4.4. Amazing how much more enjoyable it is to do chores while you daydream of being at the races! Anyone ever have the wife ask you why your yard looks like a race track!?
Hell yeah Brotha!!!! I run Maxima 927 in my weed eater and blower......!!!!! Makes the yard work WAY MORE enjoyable!! Rock On!!!
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fullysicmate
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fullysicmate 2/21/2020 8:26pm
2/21/2020 8:26pm
And to think someone may stumble upon this thread one day looking for useful information.
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Jaybird67k
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Jaybird67k 2/21/2020 9:33pm
2/21/2020 9:33pm
Race fuel in a stock bike lowers horse power and response unless properly tuned for it.
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ktmdan
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ktmdan 2/21/2020 11:24pm
2/21/2020 11:24pm
Everyone please buy and read a copy of Heywood’s ICE fundamentals and then stfu. Thx
CASH476
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CASH476 2/22/2020 1:42am
2/22/2020 1:42am
FYI, pages 2--5 are where the good info is 🤣
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jock
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jock 2/22/2020 3:55am
2/22/2020 3:55am
wolf918 wrote:
If I push hard, it takes me 6hrs to mow my yard on my rider. I put my earbuds in and rock out to Metallica all...
If I push hard, it takes me 6hrs to mow my yard on my rider. I put my earbuds in and rock out to Metallica all while smelling the sweet smell of 4.4. Amazing how much more enjoyable it is to do chores while you daydream of being at the races! Anyone ever have the wife ask you why your yard looks like a race track!?
Keating wrote:
Hell yeah Brotha!!!! I run Maxima 927 in my weed eater and blower......!!!!! Makes the yard work WAY MORE enjoyable!! Rock On!!!
What mix are you running it at? : Smile
Rick Amatuzio 2/22/2020 4:27am
2/22/2020 4:27am
nascarnate326 wrote:
I run U4.4 in my 17 KX250F and my only mod is a pipe. I can 100% tell a difference when using U4.4. Think about it...
I run U4.4 in my 17 KX250F and my only mod is a pipe. I can 100% tell a difference when using U4.4. Think about it, regardless of how the fuel gets to the combustion chamber having oxygen molecules in the fuel is going to help it explode faster. On a 450 I don't think anyone NEEDS it but it burns cleaner (supposedly) so why not? I try to use VP on the track and ethanol free pump premium when on a trail

Being a big guy on a 250F I need all the help I can get. The moto specific fuels like T4, U4.4 are designed as a pour in replacement..the bikes don't need a map change to run better. They may run even better if you do get a new map but stock maps have worked on my last three bikes with VP fuel.
dmm698 wrote:
How is u4.4 a pour in replacement with no mapping required at 7+% oxygen content by weight. Stoic is like 13.1 on that fuel. Considerably lower...
How is u4.4 a pour in replacement with no mapping required at 7+% oxygen content by weight. Stoic is like 13.1 on that fuel. Considerably lower than pump, you’re lean on u4.4 with stock mapping.
And pump fuel has plenty of oxygen. Anything containing ethanol, methanol, etc...
Pump fuel generally is 15% ethanol, which makes it 4%
oxygenated by weight I think.

Rick Amatuzio 2/22/2020 4:34am
2/22/2020 4:34am
The best money I ever spent was going to Tokyo mods on my 350. I wouldn’t spend another dollar on a pipe. Oversized front rotor, and if you can afford good fuel have your bike mapped to run according, it’s best bang for your buck. U4.4 in a stock bike, didn’t do anything but when when I went to their map for it, it was pleasantly surprised. It was about a 20% improvement across the board.

I couldn’t tell a 1% difference between the stock pipe and 1100$ stupid FMF 3 piece Titianiun that wouldn’t fit properly on my 2017 350.
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bpaderta
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bpaderta 2/22/2020 4:57am
2/22/2020 4:57am
I run it in everything other than my car. Generator and lawn mower seem to love it. Bikes seem to run fine with it too.
bad juju
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bad juju 2/22/2020 6:36am
2/22/2020 6:36am
zehn wrote:
Found the guy that runs VP in his stocker....Tongue
captmoto wrote:
I run VP T4 in my stock FC450. If you had to run shitty California gas you would consider it too.
Stop it... our shitty pump gas costs a lot of money....
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H4L
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H4L 2/22/2020 7:46am
2/22/2020 7:46am Edited Date/Time 2/22/2020 7:55am
Jaybird67k wrote:
Race fuel in a stock bike lowers horse power and response unless properly tuned for it.
Huh.. I’ve tested this theory in the past & recently on a bone stock 06 Y250 a couple of weekends ago.
My experience tells me otherwise. On the YZ there was a noticeable surge in the mid range & it allowed the engine to rev a bit longer in the rpm’s with the higher octane.
This was comparing 91 (pump fuel) to 101 (their race fuel) CA 76 octane fuel with no jetting changes.
Tokyo_Tiddler
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Tokyo_Tiddler 2/22/2020 8:00am
2/22/2020 8:00am
Jaybird67k wrote:
Race fuel in a stock bike lowers horse power and response unless properly tuned for it.
H4L wrote:
Huh.. I’ve tested this theory in the past & recently on a bone stock 06 Y250 a couple of weekends ago. My experience tells me otherwise...
Huh.. I’ve tested this theory in the past & recently on a bone stock 06 Y250 a couple of weekends ago.
My experience tells me otherwise. On the YZ there was a noticeable surge in the mid range & it allowed the engine to rev a bit longer in the rpm’s with the higher octane.
This was comparing 91 (pump fuel) to 101 (their race fuel) CA 76 octane fuel with no jetting changes.
H4L.. Not unless the motor already needed the higher octane in the first place or other factors were involved other then the octane level. What Jaybird stated is a well known fact with an underlying scientific rationale. This fact is well known among race engine builders. What do you think there are so many different octane levels? You match the octane level with your engine requirements, running the lower octane fuel that still keeps your engine out of detonation plus a reasonable safety margin. If you think it is not true and a conspiracy theory, I will make sure not to get into a climate change discussion with you Smile
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H4L
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H4L 2/22/2020 8:03am
2/22/2020 8:03am Edited Date/Time 2/22/2020 8:06am
Tokyo_Tiddler wrote:
H4L.. Not unless the motor already needed the higher octane in the first place or other factors were involved other then the octane level. What Jaybird...
H4L.. Not unless the motor already needed the higher octane in the first place or other factors were involved other then the octane level. What Jaybird stated is a well known fact with an underlying scientific rationale. This fact is well known among race engine builders. What do you think there are so many different octane levels? You match the octane level with your engine requirements, running the lower octane fuel that still keeps your engine out of detonation plus a reasonable safety margin. If you think it is not true and a conspiracy theory, I will make sure not to get into a climate change discussion with you Smile
Ha Ha ! Well played Mr. Tiddler. Well I am in CA..

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seth505
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seth505 2/22/2020 8:17am
2/22/2020 8:17am
Jaybird67k wrote:
Race fuel in a stock bike lowers horse power and response unless properly tuned for it.
H4L wrote:
Huh.. I’ve tested this theory in the past & recently on a bone stock 06 Y250 a couple of weekends ago. My experience tells me otherwise...
Huh.. I’ve tested this theory in the past & recently on a bone stock 06 Y250 a couple of weekends ago.
My experience tells me otherwise. On the YZ there was a noticeable surge in the mid range & it allowed the engine to rev a bit longer in the rpm’s with the higher octane.
This was comparing 91 (pump fuel) to 101 (their race fuel) CA 76 octane fuel with no jetting changes.
This makes sense because the stock yz is on verge of detonation/pinging.
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H4L
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H4L 2/22/2020 8:24am
2/22/2020 8:24am
seth505 wrote:
This makes sense because the stock yz is on verge of detonation/pinging.
Agree. The newer gen. 05+ 250 2t’s were all pretty much on the verge of detonating on pump fuel.
Keating
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Keating 2/22/2020 9:01am
2/22/2020 9:01am
wolf918 wrote:
If I push hard, it takes me 6hrs to mow my yard on my rider. I put my earbuds in and rock out to Metallica all...
If I push hard, it takes me 6hrs to mow my yard on my rider. I put my earbuds in and rock out to Metallica all while smelling the sweet smell of 4.4. Amazing how much more enjoyable it is to do chores while you daydream of being at the races! Anyone ever have the wife ask you why your yard looks like a race track!?
Keating wrote:
Hell yeah Brotha!!!! I run Maxima 927 in my weed eater and blower......!!!!! Makes the yard work WAY MORE enjoyable!! Rock On!!!
jock wrote:
What mix are you running it at? : Smile
Was 60:1 in my 250SX, 32:1 C12 in my modded YZ125, and the weed eater gets whatever can is fuller....🤙🤙😉😉
I'm selling my 250SX and got a RM-Z 250 and that's what brought me to this thread.... Looking for some more power for my build!! A lot of crazy B.S. on here! And it looks like my "weed eater" post has revived it... LOL! Good Times!

Falcon
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Falcon 2/22/2020 9:07am
2/22/2020 9:07am
Tokyo_Tiddler wrote:
H4L.. Not unless the motor already needed the higher octane in the first place or other factors were involved other then the octane level. What Jaybird...
H4L.. Not unless the motor already needed the higher octane in the first place or other factors were involved other then the octane level. What Jaybird stated is a well known fact with an underlying scientific rationale. This fact is well known among race engine builders. What do you think there are so many different octane levels? You match the octane level with your engine requirements, running the lower octane fuel that still keeps your engine out of detonation plus a reasonable safety margin. If you think it is not true and a conspiracy theory, I will make sure not to get into a climate change discussion with you Smile
H4L wrote:
Ha Ha ! Well played Mr. Tiddler. Well I am in CA..
BTW, my '06 YZ250 definitely had a detonation problem with the stock jetting. It could certainly have used race fuel at that time. Probably not helpful in most stock bikes, though.
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H4L
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H4L 2/22/2020 9:30am
2/22/2020 9:30am Edited Date/Time 2/22/2020 9:35am
Falcon wrote:
BTW, my '06 YZ250 definitely had a detonation problem with the stock jetting. It could certainly have used race fuel at that time. Probably not helpful...
BTW, my '06 YZ250 definitely had a detonation problem with the stock jetting. It could certainly have used race fuel at that time. Probably not helpful in most stock bikes, though.
Yeah. In my case the 06 was not detonating on 91 pump fuel, but I’m sure more than likely it would have at hotter temps on the 91 octane.
I’ll be testing this theory on a 20 CRF450r WE as I’m curious if I’ll notice a change using 91 octane vs. the 101.
I have always been under the belief that there is a reason for having higher octane fuels as noted in this thread, but through the yrs. I have found that it will make somewhat of a noticeable difference in stock engines.
zippytech
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zippytech 2/22/2020 9:41am
2/22/2020 9:41am
All, I know is since I stopped running pump gas 28 years ago. I stopped having any fuel related engine issues.
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Rick Amatuzio 2/22/2020 10:23am
2/22/2020 10:23am
zippytech wrote:
All, I know is since I stopped running pump gas 28 years ago. I stopped having any fuel related engine issues.
Such as? In my entire life I don’t think I’ve had a fuel related engine issue with pump.
Timo_2824
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Timo_2824 2/22/2020 11:05am
2/22/2020 11:05am
zippytech wrote:
All, I know is since I stopped running pump gas 28 years ago. I stopped having any fuel related engine issues.
Rick Amatuzio wrote:
Such as? In my entire life I don’t think I’ve had a fuel related engine issue with pump.
Nor have I, been running pump gas since 1996 with no fuel related engine issues. Now FCR pilot jet issues I've had are definitely fuel related. It's totally a bobblehead effect on modern EFI 4 strokes. I bet the issue with 2-strokes is they are prone to hotspots with a good sized dead air zone in the combustion chamber since the intake and exhaust ports are fairly low in the cylinder. They are fairly low CR engines compared to 4-strokes.
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zippytech
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zippytech 2/22/2020 12:41pm
2/22/2020 12:41pm
I have also noticed my power values are cleaner Plus my bike can sit for months and just fire right up. I would not pay 8 bucks a gallon if I thought I could run pump gas with the same luck. I run race gas in every thing I have, chainsaws, weed eaters.
bvm111
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bvm111 2/22/2020 12:46pm
2/22/2020 12:46pm

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Rick Amatuzio 2/22/2020 2:47pm
2/22/2020 2:47pm
zippytech wrote:
I have also noticed my power values are cleaner Plus my bike can sit for months and just fire right up. I would not pay 8...
I have also noticed my power values are cleaner Plus my bike can sit for months and just fire right up. I would not pay 8 bucks a gallon if I thought I could run pump gas with the same luck. I run race gas in every thing I have, chainsaws, weed eaters.
How about your 6:1 4 stroke lawn mower? MRX02 would be perfect for you
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MX558
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MX558 2/22/2020 3:37pm
2/22/2020 3:37pm
mxb2 wrote:
Anything pump isnt consistent. , Regular, cam2, vp. Its still from.a pump.
cody41 wrote:
I have running premium pump fuel in every four stroke I’ve had and run cam2 pump race fuel in my smokers. I am A class speed...
I have running premium pump fuel in every four stroke I’ve had and run cam2 pump race fuel in my smokers. I am A class speed and have let my fuel sit for months. Never once had a problem with pump fuel.
Same here except the A class speed part 😁

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