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Yamaha t50 piston rings/kit

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Yamaha t50 piston rings/kit

Post  Chris p on Mon 17 Sep - 18:30

Hi I don’t suppose anyone knows where to get a piston kit or even a set of rings for a t50 townmate do they? Can find them for the t80 but I’ve drew a blank looking for the t50. Any help greatly appreciated. Chris

Chris p

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Re: Yamaha t50 piston rings/kit

Post  JohnW on Tue 18 Sep - 9:55

Chris p wrote:Hi I don’t suppose anyone knows where to get a piston kit or even a set of rings for a t50 townmate do they? Can find them for the t80 but I’ve drew a blank looking for the t50. Any help greatly appreciated. Chris

Fowlers M/C's have pistons @ £31.50 and ring sets @ £20.65 on back order https://www.fowlersparts.co.uk/parts/3974548/t50-2fm-1986-999-a/crankshaft-piston
It may be better to source a good secondhand T80 4 speed engine unit which will transform your bike into a much more lively and usable bike, the T50 is a gutless wonder which was aimed at the moped market. If you do the change you will need a T80 CDI ignition unit as although they look the same they are different. Other than that it should be a straightforward swap.

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Re: Yamaha t50 piston rings/kit

Post  Chris p on Tue 18 Sep - 13:16

Thanks John, really appreciate that. It is a bit of a gutless wonder, but with having a t80 aswell I want to keep it as a 50, Ive toyed with fitting a t80 barrel kit and changing the jets a few times but keep going soft! Thanks again.

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Re: Yamaha t50 piston rings/kit

Post  JohnW on Tue 18 Sep - 18:20

In that case and if you are in no hurry to get it fixed put an order in with Fowlers for a new piston and rings. Why does it need new rings is it smoking and burning oil?

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Re: Yamaha t50 piston rings/kit

Post  Chris p on Tue 18 Sep - 18:43

Hi yes it’s smoking lightly to modereltey when the throttle is quarter open or more, fouling the plug terribly too, I’ve stripped it this afternoon nothing really standing out so I think il do the valves and try for a piston kit while I’m at it, it’s on 13,000 miles and looking at it I doubt it’s been touched before, add to that it’s been stood since mid 90s until recently.

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Re: Yamaha t50 piston rings/kit

Post  JohnW on Wed 19 Sep - 12:25

Chris p wrote:Hi yes it’s smoking lightly to modereltey when the throttle is quarter open or more,  fouling the plug terribly too, I’ve stripped it this afternoon nothing really standing out so I think il do the valves and try for a piston kit while I’m at it, it’s on 13,000 miles and looking at it I doubt it’s been touched before, add to that it’s been stood since mid 90s until recently.

Worth lifting barrel and checking the rings are free in their grooves (or not actually broken) Also make sure breather pipe (No 4 on crankcase diagram) is clear. Also make sure oil level correct, only fill to 1/2 way up sight glass. £13000 is not an extreme mileage unless the engine has been abused and piston has seized.
If you still need a piston a barrel 'duckrider' who lives in Greece may know a source. I understand there are still many T50's in Greece and parts still available out there.

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Re: Yamaha t50 piston rings/kit

Post  Chris p on Wed 19 Sep - 12:47

Thanks John, the piston rings were very sticky and congealed underneath where they meet the piston I have cleaned all this thoroughly now and looks a lot better, I may get away with it now, not sure while it’s apart to just do it all, or save the money and clean it all hoping it’s cured it. Is it common for the valves to need doing or do you think these should be ok too with a clean up and set correct? I can’t seem to see the breather pipe is it no4 on Fowler’s diagram? Thanks again for your help and advice.

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Re: Yamaha t50 piston rings/kit

Post  JohnW on Wed 19 Sep - 16:40

I would put it back together and see how it is now, if the oil control ring is a 3 part affair (2 rings and an expander like the T80) it should be OK. As for valves unless they have really pitted seats or burnt out just a re grind with valve paste will be fine, no need to replace them. Would be worth fitting new valve seals (item 3 Valve) in stock at Fowlers £2.75 each, yes the breather pipe is No4

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Re: Yamaha t50 piston rings/kit

Post  Chris p on Wed 19 Sep - 17:05

Hi yes it’s A 3 piece job the 3rd ring is, that was quite sticky and gummed up, the 3 holes underneath it on both sides were blocked good and proper so I’m wondering and hoping that this was the problem, hopefully within the next few days il have it all back together and it will be cured, thanks again Forbes then help and il post an update with the results!

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