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Idiots Guide - Setting Up Timing


dougalthedog
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Hi

Rebuilding a TY250 Mono,

Can anyone post a complete idiots guide to re-installing the generator and setting up the timing. Motor has been stripped and rebuilt by local Yamaha specialist.

I could take the generator to him, but would prefer to learn how to do it myself.

Thanks in anticipation.

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Ummm, ok - I havent seen one of these apart so I'll try and give you a generic guide. Normally I will mark the stator before removal and just line up the marks on reassembly but I have to assume you haven't done this. For basic fitting the stator will really fit only one way around - use the wiring loom as a guide to show the orientation. Fit the retaining screws/bolts/whatever. You may be able to "ballpark" it by lining up the existing bolt marks - do so if you can. Otherwise go midway in the slots. I think your bike is electronic so - refit the flywheel. Now you need a timing light. Get it started and check the marks for alignment on the flywheel and the case (at the top somewhere) at idle speed. If they line up -great. If not, stop it, remove the flywheel and move the plate a bit in the direction you need. Remember that to advance you go against direction of roataion i.e. anti-clockwise. Vice Versa to retard. Refit and repeat. Keep going till you get it and your done. Someone let me know if this bike is a points one and I'll give you the procedure for that.

PS -sometimes (always actually) it helps to give a year model as there are differences sometimes that matter!

HTH

Cheers,

Stork

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Cheers for that.

The backing plate was marked - ive lined it up and have a spark. So once rest of bike is back together I can fine tune the timing.

Pretty simple once you know how.

Another job I wont have to pay someone else to do in the future.

Once again many thanks

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