TS 250 Hop-up

[DR]

Yep Mark, I've only ever seen one other TS250 kit pipe for sale locally and I swooped. It was rooted, crushed and flattened but I spent a couple of days cutting it open and beating it back into shape. The guy who had the TS250 wreck for sale was hesitant to accept my offer of $50 and a good stock pipe as he thought I would be disappointed. I have b4 and after pics and I even amazed myself with my pathetic panel beating skills If you are thinking of selling they seem to go for around $200-$250 at an average and I am as usual interested in any of the TS model R/T kit items

[JC]

TM and TS non reed cyls will interchange (exeption being 1976 TS 250A cyl , different transfers and electrofusion bore ex factory  )

TS only has 2 transfers small intake port and non bridged smaller exhaust port.

TM 4 transfers big intake port and big bridged exhaust port.

I have a NOS TM 250 Cylinder , piston and rings for sale (no gudgeon or clips) and a used TM 250 head $Au 300.00 plus postage 

Bill, are you sure the TM has 4 transfers?  I always tho't they only had 2 like the TS barrels, but I'm no suzuki guru.

[DR]

2 transfers with bridged inlet and bridged exhaust on the TM's.
2 transfers with bridged inlet and unbridged exhaust on both TS and RL250.

[TM BILL]

Will post a pic of TM 250 cylinder   















TS 250 Cylinder

[JC]

Thanks Bill,

Looks like the 74/75 TM barrell. Earlier TM barrels were 2 tranfers I believe.

[DR]

Well thar ya go was thinking Bill's must be from the later model as all my TM barrels are of the type mentioned above. Bridged exhaust, bridged inlet and 2 transfers

[TM BILL]

Bugger and there was me thinking i had somthing special 

[Lozza]

Does the base of the TM and TS cylinders match Bill? The angle out at the flange looks different?
The TS cylinder could be made into something very good.

[DR]

they all interchange Loz, the exhaust exit angle the only difference.

[JC]

Its not an RH barrell is it Bill?

[JC]

Sorry guys
It's a 1972 model. I do have a 2nd hand TM top end, but it's already bored out to + 1.25mm. I may not get a +1.5 oversize so I'll have to re-sleeve. The (homemade) pipe also won't fit the TM barrel. Gear ratios are the same as the TM as I recall.
I'm a bit tight for time (race in 2 weeks) so I was looking to pep up the TS ports, stick on the 32mm TM carb and use it as an intermediate step.
Regards
David

David, I wouldn't be resleeving a +1.25 barrell. Wiseco make +1.5 & +2.0 pistons. I'd wait till I could find one of those. It'd be much cheaper.

If you want porting specs from back in the day, I have several mag articles. Typically they said raise the exh a couple of mms, lower the inlet (or cut the skirt) similarly, ramp the top of the piston adjacent to the transfers 1.5mm, widen the exh 7mm (but I wouldn't go wider than 49mm - 70% of bore). In general, aim for circa 180deg exh durat'n & circa 165 degs inlet. Use TM head & carb. Thats still pretty mild but should be a good starting point. I'm sure Lozza can do a lot better.

FWIW factory specs are as follows (from top of barrel):

Exh  TS 39mm  Kit Cyl 37mm
Tr    TS 53     Kit Cyl  52
In    TS 99     Kit cyl  103

The responsibilty for changes is all yours! I have no experience w TM/TS250 mods

[TM BILL]

Its not an RH barrell is it Bill?

    RH in this case right horrible  i want it gone