tf125 help needed

[husaberg]

I'll sort a fourstroke twin base engine on monday, after all Ive got two weeks.... plenty of time.

In the mean time I do have a completly stock AG100. Perhaps I might have to give it a tickle up for the first round or two. Borrrrring. Where did I put that Jennings book. I hate AG100 engines.
Pipe, carb, cast a new barrel, bugger, here we go again.

Yes CD is four speed I see.

this will get you started with the AG i mght have a RD250 reed valve somewhere.
https://www.kiwibiker.co.nz/forums/s...post1130983825

[Flettner]

this will get you started with the AG i mght have a RD250 reed valve somewhere.
https://www.kiwibiker.co.nz/forums/s...post1130983825

Did I write that shit? A bit optimistic I think.

[husaberg]

Did I write that shit? A bit optimistic I think.

Well I did my part and found the old school hop up diagrams
I likely have a rd250 cylinder and head somewhere that would be a better start?
I can even loan a you 350 one?

[Flettner]

Here is an AG100 engine but unfortunately I cant use it as the head is water cooled.
https://youtu.be/TOHKls3Cxjs

[Flettner]

I likely have a rd250 cylinder and head somewhere?

That might be a good start.

[husaberg]

That might be a good start.

it will be rusty but the price is right.
if you are allowed 175 why not the 350. i can loan that only as its for a complete bike.

oh shit i just figured out that ag is under square that isn't going to work, you need the bigger ag

[Flettner]

I do have a 52mm stroke AG100 crank. To go out to 54 Id have to spin up another one. Depends on just how serious I want to get.

125cc twostroke, 150cc fourstroke. No limit on induction pressure.

[husaberg]

I do have a 52mm stroke AG100 crank. To go out to 54 Id have to spin up another one. Depends on just how serious I want to get.

125cc twostroke, 150cc fourstroke. No limit on induction pressure.

okay i will start an excavation at dads.

[Flettner]

Drill down to 1973

[husaberg]

Drill down to 1973

its was subterranean looks like it was drug out of a swamp
Yes its pretty manky, but it will clean up it has a reed and manifold attached.
Its also unmolested with the porting which is pretty unusual.
No 250 head but i have a 350 one here you can mod.
if you want them they should be there by Tuesday.


The offset fining will give room for a large pipe
A dt or ag175 head had radial head fining

[Flettner]

its was subterranean looks like it was drug out of a swamp
Yes its pretty manky, but it will clean up it has a reed and manifold attached.
Its also unmolested with the porting which is pretty unusual.
No 250 head but i have a 350 one here you can mod.
if you want them they should be there by Tuesday.


The offset fining will give room for a large pipe
A dt or ag175 head had radial head fining

Thankyou, yes. What bore size? 56?
I might leave it like that on the outside, in keeping with the rest of the bike.

[Flettner]

I shall name the new fourstroke the,
SC150T
Its most important it gets a proper name.

[husaberg]

Thankyou, yes. What bore size? 56?
I might leave it like that on the outside, in keeping with the rest of the bike.

its i think 54 maybe plus .5.
it def going to need a hone

[Flettner]

Yamaha used to like 56 x 50.
I can change the crank to 50.0 stroke if need be....

[husaberg]

Yamaha used to like 56 x 50.
I can change the crank to 50.0 stroke if need be....

Yes, especially with the singles but the RD were 54mm. They went to it around the yds3 and back to 50.6 for the TZR.
oddly looking at the head the early 350s it seems had smaller fins than the late 250's.
I will have a decent dig foe the 250 head
Pretty sure you can make it work Flet.
either that or i know a guy a few km's from here that might have a DT125 cylinders maybe something even flasher.
They were 50mm stroke std