Did I mess things up???

[Anonymous]

I own a 1980 GS450E. I cut off the exhaust pipes right behind the silencers (I don't know what's it called, but it was the last 4 inches of the exhaust pipes), anyhow the bike is really loud, the pipes are straight shot now.
Well the problem is after I cut the pipes off the bike started acting up I don't know if is too reach or too lean, it back fires out of the right cylinder, the RPM's are all over the place it surges it stalls, black smoke is coming out of the left exhaust. I mean you need some back pressure for a good performance, but did I really mess things up by cutting the pipes if so can I fix this problem by installing supertrapp plates and creating some back pressure. Thanks you in advance to anyone with some info.

[Wingnut]

Re: Did I mess things up???

Well the problem is after I cut the pipes off the bike started acting up I don't know if is too reach or too lean,

(it's probably not to rich, it is most likely to lean)

it back fires out of the right cylinder, the RPM's are all over the place it surges it stalls, black smoke is coming out of the left exhaust. I mean you need some back pressure for a good performance, but did I really mess things up by cutting the pipes

(yes you did)

if so can I fix this problem by installing supertrapp plates and creating some back pressure.

(probably not, what is left to bolt them too?)

Thanks you in advance to anyone with some info.

(Buy a used exhaust system or get an aftermarket one, put it on and throw away the hacksaw.)

Motorcycle engines are finely tuned to the exact way they were when they came from the factory. Changes to the exhaust or the intake system will throw things all off. If you install different air filters you will need to rejet the carbs. The same goes for the exhaust. Rejetting is not for the mechanically challenged. As a mater of fact seasoned mechanics can have a hard time. You need a basic understanding of how these carbs work In your case you effectively don't have an exhaust. Just a loud bike that doesn't run right. You can't drive this thing on the road without risking getting a ticket anyway, so just fix it back right and enjoy the bike.

[Buffalo Breath]

pipes

I got to say it what where you thinking??? take the bike down to a good muffler shop and have them weld the mufflers back on, should not be a problem if you did a clean cut, and have the hard ware, make sure they are good with a torch, if they arc weld it unplug the ignition box, as a precaution, butt the mufflers back up and mount them by the muffler tabs and they should alin perfect for the welding

[snark]

You can get a brand new MAC 2 into 1 from Dennis Kirk for about $200 or email someone who is parting one of those out on ebay to see if they have a good set.