HardLuck Posted March 13, 2010 Report Share Posted March 13, 2010 So tonight I change my sprocket from a 14t to a 13t after taking off the side case off I found out my bike has a timing plate and its set at +5.....The guy I bought it from knew nothing about what was done to the bike so I'm slowly finding out the details of it....Question is the bike has a K&T cool head, aftermarket carbs, +5 timing.....What octane should I run in the bike? I don't know what size domes it has yet cuz I haven't taken the head off..........Any help will be great! Thanks! Quote Link to comment Share on other sites More sharing options...
GrMeyer Posted March 13, 2010 Report Share Posted March 13, 2010 What was ran before for oct? Quote Link to comment Share on other sites More sharing options...
Profilact Posted March 13, 2010 Report Share Posted March 13, 2010 Do a comoression test to be sure.... Quote Link to comment Share on other sites More sharing options...
baker Posted March 13, 2010 Report Share Posted March 13, 2010 the timing shouldnt afect what octane ya run, its all in the dome size or compression,150 or lower pump gas, 150 id run a 50/50 race to pump, over 150 race fuel all the way Quote Link to comment Share on other sites More sharing options...
bansheesandrider Posted March 13, 2010 Report Share Posted March 13, 2010 Timing will affect what octane you should run. Advanced timing can lead to preignition and higher octane fuel will prevent that. Higher compression lead to detonation and higher octane will also prevent that. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted March 13, 2010 Report Share Posted March 13, 2010 Timing most certanly afeects it Quote Link to comment Share on other sites More sharing options...
firebanshee Posted March 13, 2010 Report Share Posted March 13, 2010 I would set the timing at +4 unless you want more for a specific reason, +4 seems to be the sweet spot for pump gas. Quote Link to comment Share on other sites More sharing options...
HardLuck Posted March 13, 2010 Author Report Share Posted March 13, 2010 Thanks guys....So far I've only rode about a half a tank of 91 threw it but I did notice while climbing hills there was a slight pinging but only while climbing....So I'm gonna do a compression test today and may go get some 100octane Quote Link to comment Share on other sites More sharing options...
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