I have a 74 yamaha DT360 and the top speed is 82.6, why can I only get to 40 mph in fifth gear?

Question

The guy I bought it from took great care of this bike for five years but only rode it 577 miles in that time period. If I let it sit for longer than an hour I have to use the choke to get it kickstarted.

I let it idle around 1800 - 2200 rpms, is that too high?

Thanks

Answer 1

idle is to high,i would pull down carbs and clean them before you melt a piston,check air filter,if you dont own a clymer shopo maqnual buy one for that bike,parts are getting scarce,not a bad idea to lightly pre mix oil in gas along with oil injection better to foul a plug the seize a piston,rebuild oil injection pump also,small diagphram style pump,clean out oil tank,2 cycles dont last but an instant without oil

Answer 2

The carb on a bike that old surely needs cleaned.  There are two small jets in it, one with a very small hole,  just buy a new one.

Thats idling way too fast, about 1,000 rpm is

right.

Answer 3

way to high on the idle.

900 to 1000 rpms would be better.

take the bike to your local yamaha dealer

and let them check it out.

Answer 4

definitely too high

carb clogged?

low compression?

carbon built up in exhaust?

secondairy gearing short?

how on earth did you come up with 82 POINT 6 mph?