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Posted

just had a stock head milled a bit for a little more bottom end. now my comp numbers are 150 on the right and 140 for the left. i was pretty rich before so i leaned my jetting a bit and now throttle response is really crisp, gonna do some chops to make sure im not too lean. anyway i assume i should probably be at least mixing in some 110 with those #'s and +4 timing. do you guys think im ok with mixing 50/50 110 and 94 (sunoco)? when i started it after getting it back together i noticed a ping from the right side (150 psi) so i know i need to do something. if i adjust my timing back to 0 would i be ok on 94 or should i just mix to be safe, or do i need to go complete 110? my elevation is around 800 ft if that matters. also will detonation be more likely to occur when the motor is warm or cold? seemed like after it warmed up a bit it went away. sorry for all the questions and thanks in advance for the help.

Posted

You will be good with 94 pump by itself.

 

I would be starting to be concerned about why there's a 10psi drop on one of the cyls though. I would check the ring gap and see if the rings are starting to wear.

Posted

Could be that the bike warms up more and runs a bit richer ...You might want to fatten up the main one step and back the timing a tad and see if you hear any... Im kinda in the same boat....Was pinging...at 6K WOT.... Im using race gas now 110....It sure loves the gas :) but very expensive.... Did make the ping go away...Ill need to turn the timing down around that 6K RPM mark...Im thinking ill end up mixing 50/50 just in case ;)

Posted
You will be good with 94 pump by itself.

 

I would be starting to be concerned about why there's a 10psi drop on one of the cyls though. I would check the ring gap and see if the rings are starting to wear.

 

 

i hope your right. once i do some plug chops ill run it some and see if the noise goes away. it may not even be detonation that im hearing, i was just a little worried so thought id ask. any one know a good way to describe what deto. sounds like?

 

as for the 10 pound difference, its because the left side got a bit damaged from a broken circlip. i honed it and cleaned it up best i could for now im hoping it will last me the rest of this year since im .080 over and ill prolly need different juggs next time....damn circlip

Posted

detonation sounds like to pieces of metal rattling against each other.... If it sounds like that dont be fooled into thinking its something vibrating at that RPm :) Its 99% sure its detonation.....

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