Piston Ported TZ 250 monoblock

[Tobyjugs]

I bought a couple of boxes of engine parts from a retired racer. In amongst the bits there is a monoblock and cylinder head from a TZ 250. Can anyone tell me about these parts

[oldelsieboy]

Dec 2, 2017 11:01:25 GMT 1 Tobyjugs said:

I bought a couple of boxes of engine parts from a retired racer. In amongst the bits there is a monoblock and cylinder head from a TZ. Can anyone tell me about these parts

Plenty of info here

www.tz350.net/homepage.htm

OEB

[Tobyjugs]

Thanks OEB I have been there. I would like to know the pro's and con's of these and are they still cherished etc

[bare]

Lovely bits .. in 1974. Chrome bores and they ran single ring pistons. Lots of them.
Re piston/re ring after a couple of Race weekends .. sometimes longer, sometimes less.
They are/were ported for Peak Hp/ narrow power bands. Making them a bit of a Pig to ride anywhere but on a track.
IF mine I'd think about selling them on to a Vintage racer type.. where they could be used /appreciated.

[Tobyjugs]

Dec 3, 2017 19:54:11 GMT 1 bare said:

Lovely bits .. in 1974. Chrome bores and they ran single ring pistons. Lots of them.
Re piston/re ring after a couple of Race weekends .. sometimes longer, sometimes less.
They are/were ported for Peak Hp/ narrow power bands. Making them a bit of a Pig to ride anywhere but on a track.
IF mine I'd think about selling them on to a Vintage racer type.. where they could be used /appreciated.

I didn't expect the parts to come from the 70's 😁. Yes they have chrome bores.

The only info I saw was on the RC forums which basically said piston porting is rubbish 

[bare]

Of course they would claim that.
Pretty impressive setup when New though.
Good 'nuff to put Yama in the front rows of the race heirarchy

[Tobyjugs]

I have got no use for it but I like the thought I own some real classic racing parts