Tf 125 motor bucket thingy

[layton]

Progress all be it slow, fork seals done, swing arm bearings replaced ( stupid bloody things), headstock.bearings done, frame and stuff painted. Made a hot dip tank out of a slow cooker so have been working on a nasty soup, works a treat.. been really busy at work hopefully I will get on to the engine shituation next week.

Also got a 3D printer so made some fork caps!! Cool toy.

[mr bucketracer]

I would cut that subframe off and have a light weight bolt on one

[layton]

That's a good idea, maybe after I do a few circles. Dont want to create more work at the moment I have other things that need attention

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[F5 Dave]

Good plan. Prioritise getting out.

[layton]

mmmm.... so i have been in to order the parts and they can't find any aftermarket pistons available in that size range! only the wiseco TF piston... that kinda sucks. seems that the stock is all but dried up! anybody have suggestions? i have asked a few different places with a similar answer..

i dont really want to build an engine that i cant get more pistons for as i am bound to cook a few.

i am okay with using the STD piston but was looking forward to building a frankenstein

[husaberg]

mmmm.... so i have been in to order the parts and they can't find any aftermarket pistons available in that size range! only the wiseco TF piston... that kinda sucks. seems that the stock is all but dried up! anybody have suggestions? i have asked a few different places with a similar answer..

i dont really want to build an engine that i cant get more pistons for as i am bound to cook a few.

i am okay with using the STD piston but was looking forward to building a frankenstein

Have you tried Mikita and Pro X TKRJ

I thought Rob (TZ350)) offered you some earlier
Failing that Ebay NOS

[TZ350]

16mm pin.

I have had a lot of luck buying pistons off Ebay. What size piston pin are you looking for? We used different rods mainly to get extra crankcase volume and 16mm piston pins as there are more 56mm+ pistons available with 16 mm piston pins than there is for 14mm pins.

[layton]

16mm pin would be ideal due to there being more sizes available, i had looked on ebay and on the net there is a few around but i wanted something in the country like have my hands on it next week sort of thing.. ya know, wanted it yesterday and all that.

by the way you can get stepped pins from PROX.

[husaberg]

plenty others on site
https://454.co.nz/product/10351/
https://454.co.nz/product/22667/

[layton]

plenty others on site
https://454.co.nz/product/10351/
https://454.co.nz/product/22667/

Can I use a KX piston even though the bore on the tf isnt nikasil

I was told that KX rings wont work in the steel sleeve?

Are those CR motors piston port?

[husaberg]

Can I use a KX piston even though the bore on the tf isnt nikasil

I was told that KX rings wont work in the steel sleeve?

Are those CR motors piston port?

buggar you are right the latter 80-84 are CR cylinder reed rather than case reed.
ones prior to about 78 are piston port that will be okay.
but the os ones for 87 on are crankcase reed.

the 2mm oversize etc big bore pistons are made genarally for steel sleeves
hve a look through the list
personally i would try and find ones for a steel sleeve with oversizes the ones for plated cylinders only have std plus big bore.
shame strike dont do 56mm bores
WHat bore do you actually have?

[layton]

Pretty much bang on 56mm. I have been told conflicting information re the plated bores and using there pistons on steel sleeves. Seems there are a few KX options might be able to get my hands on a 90s yz piston, just need to double check with there supplier on the size ranges.

If all else fails I can go piston port and use the CR pistons and block the reed off.

I will find something!

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[TZ350]

Can I use a KX piston even though the bore on the TF is not Nikasil. I was told that KX rings wont work in the steel sleeve?

We ran Kawasaki KX 125 pistons and rings in our steel sleeved Suzuki GP125's for years with no problems. The GP cylinder is identical construction as the Suzuki TF TS cylinders. In fact we have run all sorts of makes of pistons and all sorts of ring material without problems other than the self inflicted wounds of poor tuning. The only real no no is a chrome ring in a chrome bore. Not may chrome bores now days, mostly they are Nikasil and you can run chrome rings in them.

[husaberg]

Pretty much bang on 56mm. I have been told conflicting information re the plated bores and using there pistons on steel sleeves. Seems there are a few KX options might be able to get my hands on a 90s yz piston, just need to double check with there supplier on the size ranges.

If all else fails I can go piston port and use the CR pistons and block the reed off.

I will find something!

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Early suzuki case reeds pretty much run piston port pistons
watch out for windows in yamaha pistons.


i have some new old stock CR125 Elsinore pistons here if you want try them
$50 each i guess i would have to check the sizes but pretty sure i have std as well os .25.
they have wide rings but should be good for a start.

But newer piston are better.

if you went 16mm pin you can go for TZR250 piston with are available in heaps of oversizes out to 2mm
http://tkrj.co.jp/goods/m-AY0930X-2YK.php

or RG in 14mm
http://tkrj.co.jp/goods/m-AS8040X-21A05-21A15.php

this might be a typo but RS125 pistons out to 2mm
http://tkrj.co.jp/goods/m-AHR010X-.php

[layton]

damn you are the man at finding this stuff, my brain melts when i look at parts catalogs for too long. i really like the TZR option, they should be in decent supply and have a good overbore size range, up to 58.90.

i am really leaning on you guys for experience, thanks for being patient!

will try and track some TZR pistons down.