DT125R FORUM

@declan no the whole aluminium bit snapped in half

@oldman Any help is amazing bro! will see how it is tomorrow and go over some of this stuff

All depends why reboring it, if the cylinder measures size you say then never been rebored. The cylinder on your year although called 56mm is actualy 55.95mm, if the cylinder is not damaged then just get it honed. If honing the cylinder then this piston is what you need.
https://www.ebay.co.uk/itm/Yamaha-DTR125-DT125-R-DTR-125-56-25mm-Bore-Namura-Piston-Kit/292513505226?hash=item441b29dfca:g:jyEAAOSwwbdWQwnA

Whatever size piston you buy whoever is reboring it will bore and hone to match what piston you supply. The best reboring is done by Karl at KPM as had them do a
few and also by PJME. Karl charges £30 for a bore and hone with return postage at £10-16 postage depending on courier and insurance required.
He will also fully port your cylinder for £100, just have to tell him what your after like more midrange etc or more mid and topend like a YZ.
http://www.kpmotosolutions.com/

@mightyman not just me then lol cheers

@sgt-robuck-5 doesn't work like that. Air pushes coolant up in the expansion tank filling it and then spits out on the road. Then returns to normal once cool. Just open the radiator cap and bleed it, problem solved.

Mine slipped with Castrol Magentec. I just use Castrol GTX Semi 5-30w

Took it into my college to ask my tutor what he thinks. (he builds race bikes) he said it looks fine and I could file it down very lightly. he also said the scratches on the outside were fine.

Ouch! Thought running rich would just cause excessive fouling?

Use a copper washer bud.

Burnt the rubber. I have done loads of these in the past, not on the shock of a dt, but when I polybushed my car I had ton take out loads of them and they are never easy.

@sgt-robuck-5 Just havea look anyway.

Poly bushes last a life time and give many benefits.

A general rule of thumb, the higher the compression the greater the power. On a two stroke, a great deal of power is made in the head.

But it's not a case of skimming the head, you need to modify skishband.

Read Graham Bells Two Stroke Performance Tuning for infinitely more detail.

@calum said in Bolt sizes and kits? Stainless steal or zinc and grading.:

m9VqkNhZ--b0f3UwRxSXqlw" target="_blank" rel="noopener noreferrer nofollow">https://www.ebay.co.uk/itm/M6-6mm-CAP-SCREWS-HEX-SOCKET-ALLEN-KEY-BOLTS-A4-MARINE-GRADE-STAINLESS-STEEL/161017654476?hash=item257d666cccm9VqkNhZ--b0f3UwRxSXqlw

Alright will have a better look into it cheers mate!

Good to know 👍 I use the one on fowler's parts.

https://www.fowlersparts.co.uk

@ninja Cheers bud she's a good gal

@irongamer727 thanks lads

@ninja I agree with sgt joining this forum was the best thing I could have done for many reasons @Calum think of Haynes as a console and the forum as a pc lol

@declan Cheers man!

@declan looks like I'll be doing a top end rebuild at some point After Christmas