Ty 80 Engine Questions/help
Posted 14 June 2012 - 02:19 AM
1: Can the gear shift shaft be replaced without splitting the cases? it looks like it just pulls right through from the clutch side (I hope so, the previous owner sheared the splnes off the end of the shaft with vise grips)
2: when I pulled the clutch case I noticed that one of the basket side pieces is snapped off. I will look for a replacement but if Ican;t get one will it still work okay? when I bought the bike the engine was out so I have no idea if it ran like this before.
Apart from these two questions the insides look very clean, no oil leaks, gear select okay (apart from the knackered shaft), stator sparks like crazy.
Daughter seems eager for me to get it fixed for her so thats another good thing.
Ebay here I come for the bits.
Any advice on the above will be greatly appreciated!
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Posted 14 June 2012 - 08:33 AM
Remove the gear lever, remove the left hand cover.
Prise the circlip off the left hand end of shaft (4) and remove the washer (13).
Working from the over side of the engine, remove the clutch.
Behind is the selector claw (1)
Prise off the claw retaining circlip (the other 4)
Press the claw down and lift away.
Remove the roller (7) and pull the shaft (8) out.
2, Someone has tried to jam the clutch basket with a screwdriver or something to undo the nut and broken the basket.
There is a flywheel/clutch tool that saves this
It should work with one missing, but it may not feel right.
Check the inner edges of these pieces of the basket, they get damaged by the plates rubbing on them, you can often file then flat again to make the clutch action smoother as the plates will run against them without sticking, also the clutch rod can get bent causing a stiff clutch that kids won't be able to operate.
There is a kit to refurb this
Posted 14 June 2012 - 08:56 AM
Posted 14 June 2012 - 10:20 AM
I wa looking at some of the ebay links and they reference that the parts also fit a YZ80, is the basic engine the same in a YZ80 as the TY80? if so, this will probably help me more as YZ motocross parts will be easier to source than TY parts here in Canada, especially thngs like gasket and seal kits. If this is the case, do you know up to what year are they similar? for example, would a gasket set for a 1977 YZ80 fit a 1974 TY80, or would it only be a 1974 YZ the same as a 1974 TY?
Posted 14 June 2012 - 10:47 AM
Posted 14 June 2012 - 02:15 PM
You can cross reference parts here
A quick look and transmission seems to have the same part numbers, as does the crankcase halves and so on.
I'd say the GT80 was the same engine apart from the stator, as you've found out, it has a lighting coil and the TY doesn't.
Methinks there will be similar shared parts with the DT50, RD60, GT80 and probably a load of others.
Posted 14 June 2012 - 03:03 PM
Posted 30 June 2012 - 12:09 AM
Posted 30 June 2012 - 01:20 PM
Posted 30 June 2012 - 03:29 PM
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Posted 02 July 2012 - 08:06 PM
And Venhill make several cables for these, standard twist grip with oil pump, standard without, amal twist and so on.
The oil pimps got removed as they never worked properly, a pain to set up and if they went wrong, major damage would occur!
If you do run on pre mix, don't forget to bung up the oil feed on the inlet (me thinks it's on top of the inlet manifold)
Posted 07 July 2012 - 01:28 AM
I picked up a second complete TY80 and made one good bike out of the two, so now I have a complete TY80 working for my daughter, and a spare rolling chassis and GT80 complete engine that I will probably sell as a project to someone for a couple of hunded dollars.
Posted 09 July 2012 - 11:10 PM
gasket sets and many parts from Dennis Kirk.com Veshrah gasket sets from TY were available, but not listed, last time I bought was several years back. from YZ and GT fit and were about $10 US, but I think the head gasket had to be punched out for bolt holes.
Oil pump, yes, remove it completely with gear. Build your own cable with a generic housing (Dennis Kirk also) and a bicycle shifter cable inner wire. That is quite a bit softer and more flexible, and easier for daughter to use.
GT80 is similar I think the cases were wider on one side so shifter is different. Heads were different, one used nuts, one used cap nuts deep into the cylinder. Some GT80 has 5 speed transm, but no advantage to change. The ratios all the same, just a higher gear on top. TY issue was the gap between gears, not the overall ratio, so the 5 speed would not help.
I had several TY80 as kids grew. sold off my remaining TY80 stuff this winter as my daughter is now 23 and in law school, middle son 25 and rode some nationals a few years back. My how they grow.
Posted 10 July 2012 - 12:49 PM
Would like a copy of the manual. Working on a rebuild of my son's Whitehawk 80, for a grandson.
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