Strange Exhaust Discoloration 4-1 V&H

I just put a new V&H 4-1 pipe on my '79 KZ650 which has a stock replacement KN filter- no pods. I know it probably needs rejetted but put it on and ran it to see how it would run. Seems to run fine, just crackles and pops on deceleration and the pipes have discolored really strange. One is really dark purple/blue almost black, two are more gold/blue and one is 100% chrome still. Are the carbs not in synch? Or what would cause one cylinder to be hotter than the others? The carbs have never been messed with but maybe some are dirty? I dont know. Just seems weird that they would turn different colors.

bikebandit.com has good price- $290 plus $7 shipping on the pipe

Thanks for the help!

Pull the sparkplugs and see what the tip colors are. Optimum is a light tan color,white is too lean, and black is too rich.

amele7 wrote:

I just put a new V&H 4-1 pipe on my '79 KZ650 which has a stock replacement KN filter- no pods. I know it probably needs rejetted but put it on and ran it to see how it would run. Seems to run fine, just crackles and pops on deceleration and the pipes have discolored really strange. One is really dark purple/blue almost black, two are more gold/blue and one is 100% chrome still. Are the carbs not in synch? Or what would cause one cylinder to be hotter than the others? The carbs have never been messed with but maybe some are dirty? I dont know. Just seems weird that they would turn different colors.

bikebandit.com has good price- $290 plus $7 shipping on the pipe

Thanks for the help!

Mabe post a pic of the discoloration. The same thing happend to me when i put a 4 into 1 vance and hines on my z1.

Most if not all stock pipes all double wall construction and the after maket stuff is single wall so heat discoloration is somewhat normal for those.