install oem exhaust

[smokyjoe]

I have a 2003 VT750DC I bought it used and it has corba drag pipes. They where installed by dealer when bike was new. I have the oem pipes and would like to install them. Is there a way to tell if carbs where jeted when cobra pipes where installed without taking them apart ? Will it damage anything to just install the oem pipes and ride ? The reason I suspect they wheren't rejetted is because the drag pipes have black soot in them.Indicating rich mixture.It also backfires on decel sometimes.

Thanks in advance

[k1958]

I don't think you can go by soot and "backfire on decel." My bone stock 500 has a small amount of soot inside the pipes and pops on decel. Always has...

[gyjoe]

I replaced some V&H pipes that came on my bike with OEMs without knowing what jets were in the carb. The V&H pipes looked a little sooty inside when I took them off and there was some decel popping with them, but the OEMs have stayed clean as a whistle since I put them on and the bike runs fine, so I believe it had the original jets all along.

[smokyjoe]

Thanks for the info. I think I'l put original pipes on and see what happens.

[AngryHatter]

Originally Posted by smokyjoe

I have a 2003 VT750DC I bought it used and it has corba drag pipes. They where installed by dealer when bike was new. I have the oem pipes and would like to install them. Is there a way to tell if carbs where jeted when cobra pipes where installed without taking them apart ? Will it damage anything to just install the oem pipes and ride ? The reason I suspect they wheren't rejetted is because the drag pipes have black soot in them.Indicating rich mixture.It also backfires on decel sometimes.

Thanks in advance

Wouldn't the straight pipes lean the mixture?

[herbyreed]

Originally Posted by AngryHatter

[Wouldn't the straight pipes lean the mixture?

Yes, less restriction = more airflow = leaner mixture.

[smokyjoe]

Hello Cobra spec. for main jet is 104 front and 106 rear for there drag pipes with no baffel.Stock main jet is 105 & 108. So wouldn't drag pipes with stock jets make mixture rich?