VP VPR fuel in modified 250 4-stroke

papa_whealie
I have a 2018 YZ250F and been running VP T4 fuel per the recommendation tech support at VP Fuels. Planning on doing some modifications to the bike this winter, one of which is bumping up the compression from stock (13.5:1) to 14:1 with a new piston. I contacted VP and asked their recommendation for fuel with this bike and higher compression, and they are recommending the VPR blend with higher octane rating. I see that the VPR blend is a leaded fuel, but the guy at VP says this is not an issue with my bike. Is anyone else running the VPR blend in their modified 4-stroke MX bike, and any issues I may need to be aware of?

-Thanks
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Factor E
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Factor E 12/23/2020 8:29am
12/23/2020 8:29am
A lead blend is better to run
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Rider 5280
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Rider 5280 12/23/2020 1:42pm
12/23/2020 1:42pm
Lead has many amazing properties for engines ... less for the environment.

Run it!
c0ncEpT
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c0ncEpT 12/23/2020 8:12pm
12/23/2020 8:12pm
If you don't race a class that specs fuel I would run U4.4
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Yeti831
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Yeti831 12/24/2020 3:55pm
12/24/2020 3:55pm
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall.

I’d even say vp110 but I recall injectors not being to friendly with leaded fuel.

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Rickyisms 12/25/2020 6:42am
12/25/2020 6:42am
Yeti831 wrote:
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall. I’d even say vp110 but I recall injectors not being to...
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall.

I’d even say vp110 but I recall injectors not being to friendly with leaded fuel.
C12 is leaded.
FahQ
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FahQ 12/25/2020 12:11pm
12/25/2020 12:11pm
Yeti831 wrote:
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall. I’d even say vp110 but I recall injectors not being to...
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall.

I’d even say vp110 but I recall injectors not being to friendly with leaded fuel.
No Oxygen in those two.
papa_whealie 12/26/2020 2:09pm
12/26/2020 2:09pm
Not sure why the VP guy says to run the VPR blend - I don't see anyone else out there say they run it in their EFI 4-stroke MX bikes??
Yeti831
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Yeti831 12/27/2020 10:06am
12/27/2020 10:06am
Yeti831 wrote:
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall. I’d even say vp110 but I recall injectors not being to...
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall.

I’d even say vp110 but I recall injectors not being to friendly with leaded fuel.
FahQ wrote:
No Oxygen in those two.
You’re absolutely right, i also could’ve sworn c12 was unleaded.

There is ms100, that’s unleaded and oxygenated.

I always thought leaded fuel and injectors were a no no but nobody seems to be having issues. I know engines love it, and I think it’ll be nice to try something oxygenated so it won’t be as temperamental at altitude.
harescrambled 12/27/2020 5:49pm
12/27/2020 5:49pm
Yeti831 wrote:
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall. I’d even say vp110 but I recall injectors not being to...
Question: why not just use c12? It’s unleaded and isn’t as expensive if I recall.

I’d even say vp110 but I recall injectors not being to friendly with leaded fuel.
FahQ wrote:
No Oxygen in those two.
Yeti831 wrote:
You’re absolutely right, i also could’ve sworn c12 was unleaded. There is ms100, that’s unleaded and oxygenated. I always thought leaded fuel and injectors were a...
You’re absolutely right, i also could’ve sworn c12 was unleaded.

There is ms100, that’s unleaded and oxygenated.

I always thought leaded fuel and injectors were a no no but nobody seems to be having issues. I know engines love it, and I think it’ll be nice to try something oxygenated so it won’t be as temperamental at altitude.
Injectors don't care about leaded fuel....it's oxygen sensors that can't tolerate it. It coats the sensor and then it gets fouled and does not work right
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Yeti831
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Yeti831 12/27/2020 9:30pm
12/27/2020 9:30pm
FahQ wrote:
No Oxygen in those two.
Yeti831 wrote:
You’re absolutely right, i also could’ve sworn c12 was unleaded. There is ms100, that’s unleaded and oxygenated. I always thought leaded fuel and injectors were a...
You’re absolutely right, i also could’ve sworn c12 was unleaded.

There is ms100, that’s unleaded and oxygenated.

I always thought leaded fuel and injectors were a no no but nobody seems to be having issues. I know engines love it, and I think it’ll be nice to try something oxygenated so it won’t be as temperamental at altitude.
harescrambled wrote:
Injectors don't care about leaded fuel....it's oxygen sensors that can't tolerate it. It coats the sensor and then it gets fouled and does not work right
Well, that’s good news.

Doing PC cams and springs with a Carillo rod and HC piston in the project bike so I, too, am kinda considering a new fuel.

Sorry I gave bad info on my other reply. That’s why I love this forum, a lot of collective knowledge to set someone straight and in the right direction 👍
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papa_whealie 12/30/2020 10:38am
12/30/2020 10:38am
The Sunoco 260 GT Plus looks like a good option also. 104 octane, unleaded, similar oxygen content to VP T4 (4.7% with Sunoco, 5.92% with VP), according to their spec sheets. RVP for the Sunoco 260 GT Plus is 6.1 psi, and 6.7 psi for the VP T4 blend. Anyone else running either the Sunoco 260 GT (100 octane) or 260 GT Plus (104 octane) in their EFI 4-stroke MX bikes?
Rickyisms 12/30/2020 11:42am
12/30/2020 11:42am
papa_whealie wrote:
The Sunoco 260 GT Plus looks like a good option also. 104 octane, unleaded, similar oxygen content to VP T4 (4.7% with Sunoco, 5.92% with VP)...
The Sunoco 260 GT Plus looks like a good option also. 104 octane, unleaded, similar oxygen content to VP T4 (4.7% with Sunoco, 5.92% with VP), according to their spec sheets. RVP for the Sunoco 260 GT Plus is 6.1 psi, and 6.7 psi for the VP T4 blend. Anyone else running either the Sunoco 260 GT (100 octane) or 260 GT Plus (104 octane) in their EFI 4-stroke MX bikes?
Friend of mine runs the 260 GT in his 2020 YZ450. Cheaper than T4 and he can't tell a difference, and he's super sensitive to bike/engine feel.
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sandman768
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sandman768 12/30/2020 6:02pm
12/30/2020 6:02pm
papa_whealie wrote:
The Sunoco 260 GT Plus looks like a good option also. 104 octane, unleaded, similar oxygen content to VP T4 (4.7% with Sunoco, 5.92% with VP)...
The Sunoco 260 GT Plus looks like a good option also. 104 octane, unleaded, similar oxygen content to VP T4 (4.7% with Sunoco, 5.92% with VP), according to their spec sheets. RVP for the Sunoco 260 GT Plus is 6.1 psi, and 6.7 psi for the VP T4 blend. Anyone else running either the Sunoco 260 GT (100 octane) or 260 GT Plus (104 octane) in their EFI 4-stroke MX bikes?
I mix the gt260 plus 50/50 with non ethanol in my stock 4T”s. Works good, no issues. Seems to have better throttle response vs straight pump gas. I also tried running it 100% and did not feel it was any better than the 50/50 mixture.
rogers
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rogers 1/3/2021 6:10pm
1/3/2021 6:10pm
VP MS109 REG (for regular) will give you the second most oxygenated fuel VP has.
papa_whealie 1/6/2021 7:06am
1/6/2021 7:06am
Yamaha is recommending the VP U4.4 fuel to use with their GYTR high compression piston in the 2014-2018 YZ250F. The VP U4.4 fuel is leaded, but in the owner's service manual it states that leaded fuel will destroy the valves, piston, rings, etc. So, who is right??
mxrider971
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mxrider971 1/7/2021 9:30am
1/7/2021 9:30am
I’ve run VPR in all of my YZ250Fs (2016,2018,2020) Amazing fuel, bike runs noticeably cooler. All stock motors however.
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FahQ
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FahQ 1/8/2021 4:26pm
1/8/2021 4:26pm
papa_whealie wrote:
Not sure why the VP guy says to run the VPR blend - I don't see anyone else out there say they run it in their...
Not sure why the VP guy says to run the VPR blend - I don't see anyone else out there say they run it in their EFI 4-stroke MX bikes??
VP guy is covering his butt because you are modifying your engine so Octane requirements are now unknown.
T4 might be fine, but VPR is the next step up. Safe recommendation. Also priced similar to T4.
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casey118
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casey118 1/8/2021 7:14pm
1/8/2021 7:14pm
papa_whealie wrote:
Not sure why the VP guy says to run the VPR blend - I don't see anyone else out there say they run it in their...
Not sure why the VP guy says to run the VPR blend - I don't see anyone else out there say they run it in their EFI 4-stroke MX bikes??
FahQ wrote:
VP guy is covering his butt because you are modifying your engine so Octane requirements are now unknown. T4 might be fine, but VPR is the...
VP guy is covering his butt because you are modifying your engine so Octane requirements are now unknown.
T4 might be fine, but VPR is the next step up. Safe recommendation. Also priced similar to T4.
T4 is the same fuel as vpr minus the lead. All I've run In my ktm 450 since 2016 is vpr. I have the motor tore down and top end replaced every 40-60 hrs with a cp hi comp piston. Motor builder says it looks like new everytime he opens it up. It's probably over kill to rebuild so soon but I feel like 500 bucks is a small investment every 2 yrs for peace of mind.
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papa_whealie 1/11/2021 4:10am
1/11/2021 4:10am
casey118 wrote:
T4 is the same fuel as vpr minus the lead. All I've run In my ktm 450 since 2016 is vpr. I have the motor tore...
T4 is the same fuel as vpr minus the lead. All I've run In my ktm 450 since 2016 is vpr. I have the motor tore down and top end replaced every 40-60 hrs with a cp hi comp piston. Motor builder says it looks like new everytime he opens it up. It's probably over kill to rebuild so soon but I feel like 500 bucks is a small investment every 2 yrs for peace of mind.
Thanks for the info. I will be running 14:1 compression in my YZ250F, so I will try out the VP VPR blend.

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