Question about Yamaha Motorcycles
Posted by Anonymous on
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Vintage Enduro Discussions Mean Green Machine 1970 Yamaha CT1B 175 1 14
Yamaha CT1B 175 1970
Vintage Two Stroke Motorcycle 1960s 1970s Service Repair Manual Spare parts for Yamaha CT1
Posted on Dec 16, 2016
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Posted on Jan 02, 2017
SOURCE: timeing a yamaha 175 enduro
Without the year of the bike I am hampered. Lets assume it is an older bike and has a set of ignition points and not a CDI model.
Pull the cover off the shifter side of the engine. Remove the spark plug then turn the flywheel so you can see the points. Oil on them? Dirt, or rust? Next check the main bearing. Do not rotate the flywheel but instead hold the flywheel firmly and lift it up and down, left and right. Was there any movement or was the flywheel rock solid?
I am willing to bet that the points were dirty and there was a lot of play in the crank bearings. If so, you will need new crank bearings and seals plus new points and condenser. The engine needs to tear down into about 75 parts in order to replace the bearings. The job requires some special tools to remove the flywheel and clutch, plus a crankcase separator the split the gearbox.
This is not a job for the beginner. I suggest you have the shop do the work and also that you spring for 3 more bearings and seals plus a fresh cylinder bore, new piston and rings and a new spark plug. You now have a brand new engine that should run well and last for many years. Please rate this solution. Thanks
Posted on Mar 18, 2009
Same happended to me with exactly the same motorcycle... I solved the provblem by replacing the crankshaft oil seal on the rightside of the crankcase. It solved the problem immediatly!
Posted on Aug 08, 2009
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