April 3, 201412 yr Does anyone out there have a spec on the proper compression reading for a TY175? My gauge showed 110 ft. lbs. Curious to know if that is low or adequate. The bike started running poorly although seems to have decent power. Symptoms are occasional backfiring, some surging on throttle shut-off and possibly a touch of pre-detonation (I'm not exactly an expert at knowing what I'm hearing). Air filter is clean. Time for rings? Bad gas? Any advice appreciated. Thanks,
April 4, 201412 yr 110 PSI is not bad. I think it should be in the 120-125 range but some experts will probably chime in. The very first think I would try is a new plug. It is amazing how many times a new plug solves problems like this. Try running briefly without the filter. A clogged filter will make a bike run poorly also. Next, try some new gas. New from the station, not just more from the same gas can. If those don't solve it, I would tend to agree with Nelly1, check the points. The side cover gaskets sometimes lose their seal and allow moisture in. This can begin to cause corrosion and foul the points. Of course the points do wear from use as well. You can access the points for cleaning and setting through the hole in the flywheel but it is a bit cramped to work on. It is better if you have the right flywheel puller and can get it out of the way. If you are replacing the points, go ahead and replace the condenser too. They sometimes fail and give symptoms as you describe. If that does not solve the problem, take the carb off, disassemble and do a thorough cleaning of all the passages, jets, etc. Make sure to record all the adjustments BEFORE you disassemble. Let us know how you get on.
April 4, 201412 yr Author Yes, I should try a new plug. That's why I like these forums – remind me of the obvious things that I overlook. The bike has electronic ignition. Thanks,
April 4, 201412 yr Replace the O ring around the base of the main jet housing in the carb float bowl, this ring if not sealing properly causes all sorts of running issues on the TY175 Yamaha. Remove the float bowl you will see it straight away. Edited April 4, 201412 yr by trialsrfun
April 5, 201412 yr Don't run away with the idea that an electronic ignition means you can't have ignition problems though. But it's usually all or nothing.
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