overrevtricky Posted April 19, 2010 Report Posted April 19, 2010 Finally got the Modquad head w/ 18cc domes on Avgas installed and running. I didnt notice very much smoke out of the pipes at all. it may be the fuel, it may not? I have been running the new setup through my head, hoping to figure out if I need to go up, down, or stay the same, no dice. If u guys could point me in one of those directions I would appreciate it!! Shop is closed today, or I would be out experimenting! Quote
SAVAGE420 Posted April 19, 2010 Report Posted April 19, 2010 I run 100LL also. Gotta remember its an oxygenated fuel. Rule of thumb is run 1-2 size bigger mains. I run two sizes bigger mains then i would just running pump fuel with my Keihins i have or the Mikunis i had long ago.. Might have to richen your needle one notch and richen your air screws a tad also, but maybe not ( i didn't have to). Every bike runs/reacts a lil diff so your going to have to see on yours and check back. So for an example if your running 150 mains now (keihin carbs) with pump gas, then switch to 100LL, i would start with a 155 or 152 and see how it is. Go by feel or do a Plug Chop also. If your running Mikunis with lets say 320 mains with pump gas i would go with 340's or 320's with 100LL and so on.... Quote
overrevtricky Posted April 20, 2010 Author Report Posted April 20, 2010 I run 100LL also. Gotta remember its an oxygenated fuel. Rule of thumb is run 1-2 size bigger mains. I run two sizes bigger mains then i would just running pump fuel with my Keihins i have or the Mikunis i had long ago.. Might have to richen your needle one notch and richen your air screws a tad also, but maybe not ( i didn't have to). Every bike runs/reacts a lil diff so your going to have to see on yours and check back. So for an example if your running 150 mains now (keihin carbs) with pump gas, then switch to 100LL, i would start with a 155 or 152 and see how it is. Go by feel or do a Plug Chop also. If your running Mikunis with lets say 320 mains with pump gas i would go with 340's or 320's with 100LL and so on.... Nice. I didn't know it was oxygenated! that pretty much clears that up! Will throw some 320's in tomorrow, up from 300's now and check back. Quote
SAVAGE420 Posted April 20, 2010 Report Posted April 20, 2010 Nice. I didn't know it was oxygenated! that pretty much clears that up! Will throw some 320's in tomorrow, up from 300's now and check back. Quote
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