KR150cc Kawa 2 Stroke

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99sr220
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KR150cc Kawa 2 Stroke

Post by 99sr220 »

Is anyone familiar with the KR150? It's a Kawasaki 2 Stroke road racing bike that was produced in Thailand through the 90's and 00s. It's very popular in Southeast Asia, but hardly known elsewhere.
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Apparently the engine is based on the KX125, although I can't be sure as info in English is hard to come by for this bike. However the bike itself is extremely common throughout Thailand, where I live. Stock they supposedly produce 30hp.

It's quite common here for people to put 2T road bike engines into MX/Enduro frames. The KR150 is favored for this as the KIPS isn't electronic and the motor is know for it's reliability.

There's a racing block that can be bought for around $180, this is 68mm, which makes it bore x stroke 68mm x 54.4, which is similar to the KDX200 (66.0 x 58.0 mm) and makes it 200cc.

Rolling chassis of aluminium framed MX bikes can be had here for around $1,500.
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A KR150 engine would be around $100, but would require work. If than bore and stroke was 68mm x 54.4 can anyone guess how similar powerwise this engine could be to a KDX or how good it would be in an MX frame? The gear box may be a problem, I'm not sure how much sprockets could help?

I'm considering putting looking for a KXF chassis and adding this engine. I wouldn't do the work myself, I don't have time and can find ppl experienced with this. Parts and work are cheap, but accurate info can be difficult to come by. I used to have a KDX220 and loved it, but parts and work were difficult here, which would be an advantage of using the KR engine.

Any ideas on the viability of this idea?
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bufftester
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Re: KR150cc Kawa 2 Stroke

Post by bufftester »

Everything is viable with enough time and money. As a road race engine, likely it won't feel much like a KDX, but it would be fun!
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SS109
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Re: KR150cc Kawa 2 Stroke

Post by SS109 »

Damn, I would love one of those! I gotta sweet spot for 2T street bikes. Why do all the other countries get the cool bikes? :doh:
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99sr220
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Re: KR150cc Kawa 2 Stroke

Post by 99sr220 »

They can really extract some power from these little engines.


This is the KR engine in a 09 YZF chassis. The seller wants $2,000.
KR YZ.jpg
KR YZ.jpg (550.79 KiB) Viewed 184 times

The racing block for this bike gives it a bore and stroke of 68mm x 54.4mm, the KDX200 is 66.0 x 58.0. Does anyone have an idea if the power would be similar or could be made to be similar? I know nothing about engines and porting. It's very difficult to get accurate info here.
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Molly's 70
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Re: KR150cc Kawa 2 Stroke

Post by Molly's 70 »

That little KR engine sounds like it's ready to go to the Gran Prix. I think it's safe to safe the two engines are completely different in their power band.
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99sr220
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Re: KR150cc Kawa 2 Stroke

Post by 99sr220 »

What part of the engine would affect the power band? Is it the porting? 55hp at the back wheel is pretty amazing for a 150cc
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Molly's 70
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Re: KR150cc Kawa 2 Stroke

Post by Molly's 70 »

Port timing gives the 2 stroke it's personality.
If you lend someone $20, and never see that person again, it was probably worth it.
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Re: KR150cc Kawa 2 Stroke

Post by ssrlewis »

Man I would like to have that to cruise around town. Wonder what it would cost to have shipped here?
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