Author Topic: dt or it175 cylinder sleeves?  (Read 981 times)

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Offline Lozza

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Re: dt or it175 cylinder sleeves?
« Reply #30 on: November 06, 2017, 07:41:12 PM »
Why not just get 2XT cylinders with the sub exhaust port, put the ignition and PV controller on, jetted right that will be around 55hp. All this big bore stuff will be a distant memory. A proper race 250,ie TZ/RS 250 has enough torque even out of band to reef your arms off.
Jesus only loves two strokes

Offline twinrock

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Re: dt or it175 cylinder sleeves?
« Reply #31 on: November 06, 2017, 11:08:16 PM »
Well  yes the 2xt version of that motor was a big up grade..but it was just not  the cylinders but the huge intakes which belong to the bottom end..cylinders are also plated (not really a fan) and very rare..but i agree a tzr can and is a great engine to start with.. fun to explore other options tho..

Offline mboddy

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Re: dt or it175 cylinder sleeves?
« Reply #32 on: November 07, 2017, 09:42:40 PM »
You shouldn't need the big intakes. You can open out the inlets to take NSR250 reed blocks.
Tyga do them for a reasonable price with the HRC stuffers. Buy them direct from Tyga. http://tyga-performance.com/product_info.php?products_id=39
They will flow enough to fit Keihin PWK35 Air Strikers.

You don't need 350cc. Done right the TZR250 engine is great. If you must have 350cc then just stick a 350 powervalve engine in it.
The two DT175 cylinder idea is a bad one. You will waste money and end up with a gutless heap of shit.
« Last Edit: November 07, 2017, 10:00:37 PM by mboddy »
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1980 Yamaha IT125G, 1979 Yamaha IT175F, 1984 Yamaha IT200L, 1977 Yamaha IT250D and IT400D

Offline twinrock

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Re: dt or it175 cylinder sleeves?
« Reply #33 on: November 08, 2017, 09:40:57 AM »
Thanks mark..i have looked into the 2xt cylinders a lil more. i have found some but it would also seem the pistons are hard to find and very exspensive .i understand u had your cylinders re bored and plated to take dtr125 pistions..so the whole operation could end up quite expensive for a street bike i agree the tzr is a great under estimated engine but my mind is always ticking, thinking outside the box..yeah i could put 350 in it but i would like to keep it tzr if i could.. i read someone mentioned yz125 cylinders of the similar era.. i can only imagine they would be in a much higher state of tune than a tzr.. and im sure could be had for not much money but has any one done it..thanks again for all the imput.

Offline Lozza

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Re: dt or it175 cylinder sleeves?
« Reply #34 on: November 08, 2017, 10:46:24 AM »
56mm pistons with a 16mm gudgeon are dime a dozen. Boring and plating a cylinder is easier and CHEAPER than fitting sleeves not to mention a far better job
Jesus only loves two strokes

Offline twinrock

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Re: dt or it175 cylinder sleeves?
« Reply #35 on: November 08, 2017, 02:44:12 PM »
Yeah i agree.. i compared some86 to 88 yz125 cylinders today at local wreckers they had far bigger transfeer and extra ports.. apart from they would just about bolt on the cylinder was the same dimentions in all other respects..