Another race gas thread

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2/29/2020 8:48 AM
Edited Date/Time: 2/29/2020 8:52 AM

I’ve been running the vp u4.4 with a 14:3:1 piston and vortex ignition on a 250f. The bike pops a lot on decel.. I’m thinking it’s cause 4.4 is so oxygenated. Still does it after richening the fuel trim on the vortex.

Does anyone mix mr pro 6 with the lower budget t4? I want to be safe from detonation. Or has has good luck with another vp with that high of a compression piston?

What about renegade?

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2/29/2020 8:52 AM

Airleak around headpipe to head flange

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2/29/2020 8:55 AM

hillbilly wrote:

Airleak around headpipe to head flange

I have the yoshimura dual system.. already sent the headers back to yoshimura to be shimmed. I hate yoshi’s design on the new Honda 250f’s

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2/29/2020 7:26 PM

Try adjusting tps up 50-80 ohms?

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2/29/2020 7:37 PM

sounds like an air leak for sure

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