2014 yz450f please help

Yamiguy51
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Yamiguy51
Edited Date/Time 9/14/2013 6:11pm
Well had a small pop every once in a while now running fmf 4.1 slip on with vp t4 and its poping like a mother fucker changed the efi to Mormond map helped a little but not much what the hell is going on!?
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Itsbroken
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Itsbroken 8/31/2013 1:52pm
8/31/2013 1:52pm
Mine did the same thing. After installing the fmf it back fired and popped like crazy. I followed the instructions all except going back and tightening bolts to the head. Went back and tightened those three bolts and it was perfect.
Hope it's something simple like that for you. I just got in a hurry!
Yamiguy51
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Yamiguy51 8/31/2013 1:55pm
8/31/2013 1:55pm
I just got the slip on...
aggiemoto99
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aggiemoto99 8/31/2013 2:01pm
8/31/2013 2:01pm
its too lean.

Needs a remap - couple the t4 with a pipe and it gets worse
S.Loyer
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S.Loyer 8/31/2013 2:12pm
8/31/2013 2:12pm
Your best bet is to call FMF with this issue.
Bike is pretty new so there wont be a whole lot of us here with any knowledge to really drop.

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tunedlength
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tunedlength 8/31/2013 2:47pm
8/31/2013 2:47pm
Itsbroken wrote:
Mine did the same thing. After installing the fmf it back fired and popped like crazy. I followed the instructions all except going back and tightening...
Mine did the same thing. After installing the fmf it back fired and popped like crazy. I followed the instructions all except going back and tightening bolts to the head. Went back and tightened those three bolts and it was perfect.
Hope it's something simple like that for you. I just got in a hurry!
Correct
90% of the time its an ex leak.
The more severe the popping the closer the leak is to the exhaust port.
Check the ex flange at the rear of the cylinder.
Yamiguy51
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Yamiguy51 8/31/2013 3:08pm
8/31/2013 3:08pm
Well put a rich map on and it stop. the bad thing though power is super mellow
Collin_Beverly 8/31/2013 3:49pm
8/31/2013 3:49pm
First of all why are you wasting your money on VP? I have the 4.1 FMF slip-on on and run 93 octane pump gas with the aggressive map I found online and mine runs perfectly. It pops very rarely. I changed the map and I am very happy with it. I am pretty sure the bike is too rich from the factory not lean.. You can get pops being too lean or too rich.
sozo
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sozo 8/31/2013 4:08pm
8/31/2013 4:08pm
Do you really need more power out of these new 450's ??? you animals... !

I have an 08 Yamaha with a pipe too but that motor / pipe combo was super mellow.
Socket946
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Socket946 8/31/2013 4:15pm
8/31/2013 4:15pm
Race gas and a slip on exhaust?

Is that like putting lipstick on a pig?
Yamiguy51
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Yamiguy51 8/31/2013 4:24pm
8/31/2013 4:24pm
Collin_Beverly wrote:
First of all why are you wasting your money on VP? I have the 4.1 FMF slip-on on and run 93 octane pump gas with the...
First of all why are you wasting your money on VP? I have the 4.1 FMF slip-on on and run 93 octane pump gas with the aggressive map I found online and mine runs perfectly. It pops very rarely. I changed the map and I am very happy with it. I am pretty sure the bike is too rich from the factory not lean.. You can get pops being too lean or too rich.
Because I get it for 8 bucks a gallon so why not? Has no ethenaol as well
Collin_Beverly 8/31/2013 4:45pm
8/31/2013 4:45pm
Collin_Beverly wrote:
First of all why are you wasting your money on VP? I have the 4.1 FMF slip-on on and run 93 octane pump gas with the...
First of all why are you wasting your money on VP? I have the 4.1 FMF slip-on on and run 93 octane pump gas with the aggressive map I found online and mine runs perfectly. It pops very rarely. I changed the map and I am very happy with it. I am pretty sure the bike is too rich from the factory not lean.. You can get pops being too lean or too rich.
Yamiguy51 wrote:
Because I get it for 8 bucks a gallon so why not? Has no ethenaol as well
That's still double the price of pump gas anywhere. Run pump gas and change the map to the aggressive map that MXA posted in 2010 (google it)...
Yamiguy51
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Yamiguy51 8/31/2013 4:59pm
8/31/2013 4:59pm
Collin_Beverly wrote:
That's still double the price of pump gas anywhere. Run pump gas and change the map to the aggressive map that MXA posted in 2010 (google...
That's still double the price of pump gas anywhere. Run pump gas and change the map to the aggressive map that MXA posted in 2010 (google it)...
Well I think the whopping 4 dollars extra is worth it but thanks for the advice finally found 2 maps for the 2014 the Preston map and the stock with gytr pipe map n works great finally no poping :-)
Itsbroken
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Itsbroken 8/31/2013 5:03pm
8/31/2013 5:03pm
Brad460
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Brad460 8/31/2013 5:14pm
8/31/2013 5:14pm
Collin_Beverly wrote:
That's still double the price of pump gas anywhere. Run pump gas and change the map to the aggressive map that MXA posted in 2010 (google...
That's still double the price of pump gas anywhere. Run pump gas and change the map to the aggressive map that MXA posted in 2010 (google it)...
Yamiguy51 wrote:
Well I think the whopping 4 dollars extra is worth it but thanks for the advice finally found 2 maps for the 2014 the Preston map...
Well I think the whopping 4 dollars extra is worth it but thanks for the advice finally found 2 maps for the 2014 the Preston map and the stock with gytr pipe map n works great finally no poping :-)
Why exactly is the race gas worth the extra $4? Your engine was not developed or tuned for race gas in its current form, you understand that..right?! You're not benefiting by running it..
Collin_Beverly 8/31/2013 5:16pm
8/31/2013 5:16pm
What did that map do? Where did you find it?
Collin_Beverly 8/31/2013 5:17pm
8/31/2013 5:17pm
Itsbroken wrote:
[img]http://www.yamahamotorsports.com/content/213/2014_gytr_power_tuner_baseline_settings.aspx[/img]
Link didn't work
Yamiguy51
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Yamiguy51 8/31/2013 5:27pm
8/31/2013 5:27pm
Brad460 wrote:
Why exactly is the race gas worth the extra $4? Your engine was not developed or tuned for race gas in its current form, you understand...
Why exactly is the race gas worth the extra $4? Your engine was not developed or tuned for race gas in its current form, you understand that..right?! You're not benefiting by running it..
It's 93 octane, unleaded and no ethonal. That's what the owners manual says to run. Plus is smells good.
bd
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bd 8/31/2013 5:38pm
8/31/2013 5:38pm
I would not put pump gas in my bike period..... shit garbage

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Yamiguy51
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Yamiguy51 8/31/2013 5:48pm
8/31/2013 5:48pm
bd wrote:
I would not put pump gas in my bike period..... shit garbage
Thanks bd! I duno wtf is wrong with this guys must work at McDonald's or something
Bruce372
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Bruce372 8/31/2013 5:49pm
8/31/2013 5:49pm
Its either lean or an exhaust leak I suspect.

As for pump gas, I will rather pay the extra for race gas with no ethanol. Ethanol has its place in life, it should be in your cocktail and not your dirt bike.
rocketsocks26 8/31/2013 5:50pm
8/31/2013 5:50pm
I agree with yamiguy51. I wouldnt put ethonol gas in my bike either.the t4 is werth every dime! And the u4 is even bettet, almost like adding a pipe to it. I run it in my 13 450sxf. Very impressive stuff
rocketsocks26 8/31/2013 5:52pm
8/31/2013 5:52pm
I road a 14 yz450 . It was all stock, and popped on decel pretty bad. Bike was alsome though.
mxb2
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mxb2 8/31/2013 5:59pm
8/31/2013 5:59pm
bd wrote:
I would not put pump gas in my bike period..... shit garbage
Yamiguy51 wrote:
Thanks bd! I duno wtf is wrong with this guys must work at McDonald's or something
I agree, why do people care how other people spend their money., you work for it , buy want you want.
TeamGreen
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TeamGreen 8/31/2013 6:07pm
8/31/2013 6:07pm Edited Date/Time 8/31/2013 6:08pm
About a year or so...ago...

A very well known Pipe (& Engine...back in his Elsinore glory days) Builder mistakenly put Race Gas in a Test Bike that was on the Dyno...KX250F...injected...BRAND NEW & STOCK...

Over 3 HP gain.

Also, any Genius that has a late model MXer and hasn't tested Race Fuels? Well, if you haven't tested them...well...then you should STFU; because, YOU ARE WRONG.

T4 versus typical pump fuel?
The T4 is consistent. Is kept in a sealed environment, is purpose made for performance, doesn't have water in it, isn't made to the Lowest Possible Standard & it has more Energy.

I'd try U4.4...I've really good luck with it. A little lead is a good thing...
Yamiguy51
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Yamiguy51 8/31/2013 6:22pm
8/31/2013 6:22pm
Some ppl told me lead is hard on the fuel pump/filter any truth to this? How much is the 4.4?
Bruce372
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Bruce372 8/31/2013 6:33pm
8/31/2013 6:33pm
who knows, but i doubt it would be an issue. the only time lead is a real problem if you are using an O2 sensor connected to an EFI box.

for a four stroke , unless its really highly tuned i think a lack of ethanol is more important then the presence of lead.

on my RM144, its gotta be 112 leaded all the way.
TeamGreen
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TeamGreen 8/31/2013 6:58pm
8/31/2013 6:58pm
I've run leaded & unleaded Race Fuels on bikes with all the sensors...never a problem.
nytsmaC
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nytsmaC 8/31/2013 7:01pm
8/31/2013 7:01pm
TeamGreen wrote:
I've run leaded & unleaded Race Fuels on bikes with all the sensors...never a problem.
Hey Manny, sent you a PM.
nytsmaC
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nytsmaC 8/31/2013 7:03pm
8/31/2013 7:03pm
I left a full tank of U4.4 in my TM 450 (injected) for 6 months and it didn't hurt anything.
Brad460
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Brad460 9/1/2013 7:41am
9/1/2013 7:41am
Brad460 wrote:
Why exactly is the race gas worth the extra $4? Your engine was not developed or tuned for race gas in its current form, you understand...
Why exactly is the race gas worth the extra $4? Your engine was not developed or tuned for race gas in its current form, you understand that..right?! You're not benefiting by running it..
Yamiguy51 wrote:
It's 93 octane, unleaded and no ethonal. That's what the owners manual says to run. Plus is smells good.
Okay makes sense..thought you were running a higher octane race fuel..and agree with you on the smell..thankfully we have a gas station close to home that sells ethanol free gas..

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