Topic: losing power?

[Sticky]

So heres the problem,

I have a 71' 750 w/ a 69' motor. Runs great around town but when i ride for over an hour and try to ride up a mountain pass that is about 3 miles long i have to down shift to 4th and the bikes only moving at 45-50mph rpms are around 4-5k and seems like shes losing power. the motor has never been rebuilt (thinking its time) the bike lives at 9,540 ft above elev. and i ride any where from 5,000 ft elev. to some where around 11,000 ft elev. What do you guys think. Keep rideing till its done and dont ride like MAD MAX \
or any sugestions would be great. Just dont have the $$$ right know for a build.

Thanks Mike,

[johnny_from_bel]

Fuel tank air vent clogged  ?

[MRieck]

Perform a leak down test (or have someone do it). You will be able to quickly see (and hear) how well the engine is sealing.

[scunny]

has it been re-jetted for your elevation ?