Bit of old school engine build

[Ketje]

Just rebuild my engine. Wanted to do something different after building a Mugello, TS1, RB20, Rapido,....... I was tired building easy of the shelf kits and Eden's 240cc (wich whom I raced early this year ) inspired me to try this. I took my old casing from the TS1 and mounted an old SX200 cilinder. I had it boerd out to 70mm. The piston is a Mitaka. Exhaust port had been widened by 1mm an openend by 1mm and the polished. I use an MB 30mm inlet manifold and is matched to the cilinder. Inlet is cleaned up but not polished. Since the casing had opened transfers from the TS1 I opened a little the transfers in the cilinder to. The cilinderhead is a 70MM AF one wich I centerd to the cilinder and then doweled it to keep it center when mounting. Openings to the side of the pistonhave been matched to transfers. Carb is a Mikuni TMX30 and the exhaust is a (i think underestimated) JL KRP1. I'm not trying to make a race monster, just a nice old 225cc. Tommorow I'm going to star it up and keep you informed. Here's some pic's yet
Mike.

[Muppet]

I like; but wot carb and pipe ya fittin an wot clearence you got for ya piston

[Steve J]

I like; but wot carb and pipe ya fittin an wot clearence you got for ya piston

I think he said something like:- " Carb is a Mikuni TMX30 and the exhaust is a (i think underestimated) JL KRP1."
Ron Moss recommends 3 thou (0.075mm) clearance with the Mitaka (Avanti) 70mm piston in an iron barrel.

[Muppet]

I dont read I just look at the pics,

muppet

[Ketje]

Clearance is 0.08mm.

Mike.

[Muppet]

Clearance is 0.08mm.

Mike.

thankyou mike; ave ya got a hpc crank in it,
muppet

[Ketje]

Yes Muppet, I got this italian, full circle, tungsten balanced crank in it. It already was with the TS1. After a lot of research and reading all kind of 2stroke tuning-books I discovered that it would not make that much difference. I hesitated a while to put a normal crank in again but this crank served me well for 5 years now so why change BTW, started it up this afternoon but with the carb still set for a 200cc. Since it's a 225cc now it's way to rich. I'll try to lean the carb down but only got 1 notch left on the needle and for a TMX 30 there are not that much needles available. If this doesn't work I'll change it to the old faithfull PHBH30 . Anyway, even with the carb too rich, it seems promising. I'll let you now my further progress.
Mike.