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Hey guys I've noticed with high compression piston this season the bike pings a bit at low rpm. 13:1:1 ratio. There's someone who sells Sunoco 110 purple at a good price. I put a fresh tank and test rode briefly and the ping seems gone. Throttle response seems improved and runs cleaner than before. Haven't put a solid moto on yet though. Do I need to be mixing this 50/50 with pump? I can get ethanol free 93 as well but that's what the bike had the ping with. It was 39 bucks for 5 gallons so the price isn't too bad. I don't want to pay for vp and honestly it's a pain to get around me anyway from what I've found. If you plan to tell me race fuel is a waste of money please don't post. Improving this bike is my hobby and with the compression increase I'm on the line and would rather be safe than sorry. I just want to know if mixing would yield better results

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You only need enough "grape juice" to stop the pinging. If 50/50 is enough than great. Octane doesn't make power, it only allows you to run higher compression without detonation. The increased compression is what makes the power. Too much octane for a motor will actually make less power.

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Yeah, you could maybe even go to 3:1 if it's a major chore getting race gas.

People say it's bad, the 110 has a curve more towards the spectrum of pump gas and making up with ethanol free should be fine. Prolly run best!

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Ok thanks for the tips guys. I'll run the tank down a bit and try 50/50 and see what that result is.

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Which coupler are you running? You may need to run the "rich" coupler with a high compression piston 

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Not necessary to run the rich coupler... run the one that feels best. I run the lean coupler with a 13.5:1 piston cams and slightly advanced timing and fuel trim. 

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I'm running the lean coupler. Always ran it stock and haven't tried the rich yet. Happy I have the ping fixed. Hoping for a nice weekend here in Iowa where I can get a day of track time in to try some different things

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I swap between the lean and stock coupler depending on the conditions. The only time I have ever used the rich coupler was in the mud when it was super sloppy.

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On 3/22/2017 at 6:05 PM, Andyb756 said:

 

Hey guys I've noticed with high compression piston this season the bike pings a bit at low rpm. 13:1:1 ratio. There's someone who sells Sunoco 110 purple at a good price. I put a fresh tank and test rode briefly and the ping seems gone. Throttle response seems improved and runs cleaner than before. Haven't put a solid moto on yet though. Do I need to be mixing this 50/50 with pump? I can get ethanol free 93 as well but that's what the bike had the ping with. It was 39 bucks for 5 gallons so the price isn't too bad. I don't want to pay for vp and honestly it's a pain to get around me anyway from what I've found. If you plan to tell me race fuel is a waste of money please don't post. Improving this bike is my hobby and with the compression increase I'm on the line and would rather be safe than sorry. I just want to know if mixing would yield better results

 

It isn't easy to get here,  and if that is a lead free one I wouldn't worry about running it straight, but like most here I would try mixing it down to the point where it was all you need.

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RACE GAS | Racing Fuel Concentrate
http://race-gas.com/

Give this stuff a try. Its cheaper than race fuel and boosts octane if you need it. However 13:1 compression ratio shouldn't ping on pump gas

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