Join Date: Apr 2012
Location: Central Illinois
Rejet for exhaust?
So I got this 1995 vn750 about a month ago, and am going through some stuff to get it running right. The rear cylinder doesn't fire well at idle but runs like a banshee once its over 2500rpm.
I replaced the champion plugs with iridiums, new wires and did the coil relay mod, seafoamed and used gumout on the carbs to fix a sticky float. Changed the oil after.
I've put about 30 miles on the plugs and pulled them tonight. The front ones are "normal" with tan deposits on the tip. The back ones are black and smell of gas, not oil.
It has on some very short "racing" mufflers the PO put on it. I got the stock mufflers in the deal also though. I've heard some people warn about changing the exhaust and its effects. My question is could these little mufflers be causing my problem? The rear cylinder has the shorter exhaust so theoretically would be effected more by a muffler swap. Increased back pressure at higher RPM would allow the cylinder to function normally?
Do people have to rejet when changing the exhaust? If so I'm betting the PO didn't. I'm wondering if putting the stock mufflers back on might fix my problem, I would rather do that then pull the carbs.
4/12/12 1st bike ever! 95 VN 750 13k
New plug wires
Coil relay mod
EPA stuff removed
Rear signals shaved
Shinko 170-110 oversized tourmaster tires
Front signals relocated.