No power at high RPMS

[craigers2]

Hope you guys can help me out a little.

I just bought a '78 GS550 with 13K miles on it. The guy I bought it from was honest with me and said that it did have this problem. He claims the bike was running great until about 3 weeks ago. He started to notice that at higher RPM's, the bike just seemed to lose all power making it unridable. He has claimed that he recently cleaned and synched the carbs, changed out the plugs and wires, etc.

He suspects that the points are the problem.

The bike starts up great and idols fine.
When you twist the throttle even in neutral, you just completely lose all power around 4-5K rpms.

Do you think this could be a problem with the points like the previous owner mentioned?

Any help would be great.

thanks
craig

[daveo]

maybe check to make sure your fuel line isn't kinked

[GS550joe]

yeah I agree it sounds fuelish

My 550 had a similar problem.. wouldn't make the higher rpms.... replaced/removed the filter.. changed plugs... still not maxing out.. but also not totally sure what condition overall the motor is in..

JP

[chef1366]

Fuelish:-) Do you have a manual and some feeler guages? Check the point surfaces and make sure they are flat and not rounded. You can clean them with some fine grain sand paper, but if they are rounded or melted replace them. Also check your timing. A dirty air filter will cause high rpm woes.

[craigers2]

cool. thanks for the help! i'll check all the stuff you guys mentioned.

thanks again!