Yamaha TY175 gearing

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husky005
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Yamaha TY175 gearing

Postby husky005 » Fri May 07, 2021 7:49 pm

Hi,
I have just bought a Ty175, it seems to run great but needs a few items replaced. Can anyone please let me know what the recommended gearing would be on the 175 for trials use. I'd like to stay with the 428 chain size. Also what length shock absorbers would work well ?
I am also looking for a new clutch cover if anyone has one that they would be willing to part with. The one on my bike has been welded at the back just in front of the kickstart shaft. Would anyone know how this damage may have occurred ?
Cheers,
Paul



Jools
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Re: Yamaha TY175 gearing

Postby Jools » Sat May 08, 2021 12:21 pm

Can I recommend NJB shocks. Cheap, excellent quality and full adjustability, you can alter the length to suit you.
No connection, just good experience with them on our TY.



husky005
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Re: Yamaha TY175 gearing

Postby husky005 » Sat May 08, 2021 8:46 pm

Thanks Jools,
Much appreciated. I'll have a look at them.
Best regards
Paul



JC1
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Re: Yamaha TY175 gearing

Postby JC1 » Mon May 10, 2021 5:39 pm

Paul, I run 12/47 which feels good to me for my 80kg.


"Men are never more likely to settle a matter rightly than when they can discuss it freely"

TerrY
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Re: Yamaha TY175 gearing

Postby TerrY » Mon May 10, 2021 6:40 pm

Huski,
I would think that the damage to the clutch cover would be behind the kick start shaft. Just about every TY175 would have damage there. There is a weakness in the spiral junction between the kick start shaft and the gear attached to it. This fails after a few years and people move the kick start arrangement on the shaft to compensate. Then they get a kick back from the motor which then shoves the tightening bolt on the kick start arrangement through the clutch cover. Just about all have been repaired over the 56 years the TY175's have been around.
A replacement internal kick start arrangement from a DT175 seems to work for a longer period but will also eventually fail. They would be hard to source now as well.
People often welded the 2 internal parts as well but care is required to ensure that the parts are in the correct position before welding.
It is important for the motor tune to be kept as good as possible so that the motor starts with easy kicking. Don't just stab wildly on the kick start lever. Always take up the slack gently and then push purposely to start the motor. They generally start easily. especially with an after market electronic ignition.
If you are looking for an immaculate finish on the clutch cover, you would have to over weld the repair and then remove the excess weld to get the finish quality that you desire.
Cheers,
TerrY



Rod
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Re: Yamaha TY175 gearing

Postby Rod » Mon May 10, 2021 7:21 pm

TY 175 only 46 yrs old TerrY, God I wish I was that young again. :cry:



husky005
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Re: Yamaha TY175 gearing

Postby husky005 » Tue May 11, 2021 4:39 pm

Thanks for the replies guys, I've learnt a lot here already.
Cheers Paul



David Lahey
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Re: Yamaha TY175 gearing

Postby David Lahey » Tue May 11, 2021 7:28 pm

As for shocks length, 340mm and 360mm are popular choices.
Some people run the fork tubes flush with the top clamp if they use 360mm. I find the bike ends up too high and the steering is not pleasant with this arrangement.
The standard fork tube height setting on them is about 25mm protruding above the top clamp and that combined with 340mm shocks gives great steering and handling.
The original standard shock length is 320mm.
12/51 and 13/51 are both good choices for gearing with 428 chain. If you are heavy then the 12/51 would be the go.
For shock spring rate, 40 lb/in if you are light and 50 lb/in if you are heavy.
If you are average height or taller, a footpeg lowering kit is a good thing.


relax, nothing is under control

husky005
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Re: Yamaha TY175 gearing

Postby husky005 » Wed May 12, 2021 8:39 pm

Thanks David,
Much appreciated.




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