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Old 03-31-2007, 12:04 PM
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Default Timing For 1977 Yamaha tt500



I am looking for some information on how to set the timing for a '77 Yamaha tt500. All I can get it to do is backfire.


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Old 03-31-2007, 12:58 PM
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Default Re: Timing For 1977 Yamaha tt500

Good to see another "old bike rider" join us. Show us a pic of that TT. I'll give you a bump so maybe the good mechanics can help you. There's some smart fellers here that'll have you going in no time.
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Old 03-31-2007, 05:31 PM
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Default Re: Timing For 1977 Yamaha tt500

Well this site helps me to understand alot of things, maybe it will be usefull for u aswell Dan's Motorcycle " Ignition Timing " hope this helps.
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Old 03-31-2007, 08:48 PM
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Default Re: Timing For 1977 Yamaha tt500

Here is what I would do. Take the Leftside cover off that has the magneto and flywheel in it. Set the crank on the mark that says T even with the case "arrow. Now remove the valve covers and see if the rockers are loose. If not rotate it 360 degrees and see if they loosen up. If they don't you need to make sure you are on TDC of the compression stroke, and set the vavles before you do anything else. .003 for intake and .005 for the exhaust cold is how I do it. Those are the snug side of some years factory settings.

Now, either install new points or clean the old ones. Set the points to .015-.018 and then position them to open when the F mark lines up with the arrow.

All there is to it. The valves will make it backfire as well as dirty points, mistiming, airleaks, and carburetor problems.

It is a really neat engine.
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Old 01-14-2008, 09:45 AM
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Default Re: Timing For 1977 Yamaha tt500


Looking for some help, I am having a tough time getting the timing right on my TT500, I have bored and installed a new piston, followed the book on lining the timing marks on the T on the flywheel and the gears on the oppisite side of the flywheel, installed the head, installed camshaft@ cam gear keeper pin in the 12 oclock pisition, installed cam gear, made sure cam gear mark lined up with sealing surface of valve cover. rotated engine forward 2 revolutions to get all cam chain slack@ rear of engine, installed cam chain tensioner, assembled motor, checked and cleaned points, set valves, everything check ok, getting fire to plug, tried to start, couldnt even get it to backfire. I am guessing at this point but I think I may have assembled on motor and cam on the exhuast stroke.

My question is, after an engine is dissasembled, how do you tell if you are on the compression stroke or the exhuast stroke?

Update: Ok, with the help of a friend I finally figured out the problem, I am going to leave this post so that if someone encounters the same problem , maybe by reading it will help them, I had the motor timed on the exhaust stroke, and the way I found out was by watching the points as I turned the motor over, points closed on exhaust stroke, points open on compression stroke, that simple, some times the simplest of things will drive you crazy, Hope this helps someone down the road.

Thanks, Cbly

Last edited by cblyx6; 01-16-2008 at 09:24 AM.
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