fouls plugs like crazy

[digger]

i just fnished doing a top end rebuild (bored 20 over, wiesco pistons) now it fouls plugs like crazy!! i normaly run 32:1 yamalube... the first tank after re build i ran 24:1,and it seemed fine, now i'm using 32:1 on my second tank and it fouls all the time... i never changed jets (320 main 25 pilot) i cleaned the carbs before i put it back together. Do i need to re jet just for going 20 over...also it seems that when i'm in 6th gear it seems to rev higher and pull harder when i'm not quite full throttle.. if i pin it, it seems to make a deep slower revving noise.. not a bog or anything just seems to loose rpm. when i'm driving it hard the plugs look good nice dark brown colour... its only when i go slow that it does this.. i know banshee's arent meant to be driven slow, but it never did this before so something is up. Thx for all u'r help guys..

ps. my mods are t6's, with toomey 2:1 intake, boyesen reeds boost bottle 4* timing key

[brian]

i just fnished doing a top end rebuild (bored 20 over, wiesco pistons) now it fouls plugs like crazy!! i normaly run 32:1 yamalube... the first tank after re build i ran 24:1,and it seemed fine, now i'm using 32:1 on my second tank and it fouls all the time... i never changed jets (320 main 25 pilot) i cleaned the carbs before i put it back together. Do i need to re jet just for going 20 over...also it seems that when i'm in 6th gear it seems to rev higher and pull harder when i'm not quite full throttle.. if i pin it, it seems to make a deep slower revving noise.. not a bog or anything just seems to loose rpm. when i'm driving it hard the plugs look good nice dark brown colour... its only when i go slow that it does this.. i know banshee's arent meant to be driven slow, but it never did this before so something is up. Thx for all u'r help guys..

ps. my mods are t6's, with toomey 2:1 intake, boyesen reeds boost bottle 4* timing key

 

Did you change the type of air cleaner or something ? Sounds like its running really rich, should be showing tan on your insulators.

There might also be a problem with that boost bottle. Most guys dont even use them, they can be more harm than good.

Also, probably not related to this problem, but if your not extremely set on the Yamalube, try Klotz Supertechniplate oil. Everyone that I know uses it, and is happy with it.

[dajogejr]

You're jetting seems about right on for me...if you're at or around sea level and normal riding temps for this time of year....say 65 to 90 or so.

 

You need to do a plug chop. The insulator nose can be deceptive....

 

Check out this for more info:

 

http://www.dfn.com/benkaren/plugchop.html