Kawasaki KR1S

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2stroke
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Kawasaki KR1S

Post by 2stroke » Sat Nov 16, 2013 8:58 pm

This looks like the place to say this.

We have three KR1s all needing restoring and bought over the years.
Starting our first one two weeks ago.
Our plains were to not only restoring them make sure they perform a lot better and stronger then original.
The best oil seals
Balance crank
The best crank bearings money could buy (13000 rpm)
Porting to crank case.
Porting to cylinder
Racing kips
35mm carby
Chambers
And ran with zeeltronic

But after buying 4 second hand cranks and can't use one because there a non serviceable crank. The only 2 stroke 250 of our collection which has this. Impossible !!!

The cylinder was in good condition but needed a over side piston. Not a problem for suzuki RGV but impossible for KR1S unless you buy 200 and get it specially made.

So it's a re platting ever time it wears out. $$$.

Now we have gave up on the classic kawasaki KR1S
It's pointless restoring a bike that will cost a fortune to rebuild.
And after finding this out makes me wonder why people buy them !!

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Binetta Steve
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Re: Kawasaki KR1S

Post by Binetta Steve » Sat Nov 16, 2013 9:23 pm

Well setting aside the spelling , i stil dont understand this post

Steve

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Luders
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Re: Kawasaki KR1S

Post by Luders » Sat Nov 16, 2013 9:42 pm

it's tougher down under, but people restore and maintain them for the love of it.

A well built engine will last and won't require replating that frequently.

Not sure how you're going to get it to rev to 13000 rpm, but I can tell you, this amount of rpm will make it unreliable.

I think peak on a stock motor is about 10700, so going past 12000 is pushing the motor beyond its mechanical limitations.

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Re: Kawasaki KR1S

Post by JanBros » Sat Nov 16, 2013 11:27 pm

it's not because you can't bu original servicing parts for the crank that it can't be done. have a quick search on "cranck rebuild" on the forum.

it's not that other brands have oversize piston's, the costs are much lower. You want high performance apparently, than nicasil or something like that is the way to go and even with an oversize, you'd have to have it replated.

Don't understand your post, but from someone who call's himself "2stroke" on a forum, I'd expect both these points to be common knowledge :?:
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Re: Kawasaki KR1S

Post by Top-shaggy » Sat Nov 16, 2013 11:47 pm

With the 35 inlets ... I'm sure you referred to BDK saying they would make a copy of my R ones.

If you know BDK, you will also know they rebuild the KR-1 cranks..?

Sounds like you have thrown the towel in too soon to me... :roll: :wink:
If it takes more than 2strokes then your just playing at it..

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Re: Kawasaki KR1S

Post by 2stroke » Sun Nov 17, 2013 10:13 am

We have restored suzuki , cagiva , and aprilia. We are new to kawasaki kr1.
We have a engineer of over 30 years and knows his 2 stroke engines well.
He does all our work. We brought him the cranks and he is the one telling us the trouble with these cranks.
Look guys it was disappointing to hear this when the KR1S was our favorite bike of our collection and the reason we bought 3 and looking at another one.
So I'm just letting it out on here.
We haven't thrown in the towel just yet.

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Luders
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Re: Kawasaki KR1S

Post by Luders » Sun Nov 17, 2013 12:59 pm

I think you've been slightly misunderstood.

There is a wealth of experience on this forum, so an excellent source to resolve any particular issues you are experiencing.

As I said earlier, it's not as easy a task as what it would be in Europe. There were few of these bikes produced in the first place and even fewer were imported to Australia.

There are a few Aussie members here who will be able to share there experiences and offer advice on such things as cranks rebuilds and barrel repairs and replates.

OEM pistons are not readily available, but you can get substitutes, all the information can be found or asked here.

Given you want to get the most out of this engine, I would suggest looking at information on single ring race pistons.

Get asking some questions and see what you can find out.

I know one or two things about these engines myself :lol:

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Re: Kawasaki KR1S

Post by JanBros » Sun Nov 17, 2013 10:10 pm

and I'm sure "The two stroke institute" (member here from australia) can help you with anything regarding the KR1S and other strokers :wink:
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Re: Kawasaki KR1S

Post by 2stroke » Sun Nov 17, 2013 11:21 pm

The problem we have rebuilding our cranks is the crank web are warn.
It's not as simple as fitting a new big end Conrod pin as we have had done with other brands.
Now we are looking to find new crank webs to rebuild to new.

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Luders
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Re: Kawasaki KR1S

Post by Luders » Mon Nov 18, 2013 7:52 am

If the big end journals are worn or damaged that is a problem.

Do you not have a pair or cranks which could be split to make one good one?

If not, you might have to pick up a serviceable replacement from Europe.

I've just had a crank re-built myself and I considered the cost cheap at £300. This included seals, main bearings, con rods and big end bearings.

As Jan said TSI may also be able to help you.

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Re: Kawasaki KR1S

Post by 2stroke » Mon Nov 18, 2013 8:55 am

Luders wrote:If the big end journals are worn or damaged that is a problem.

Do you not have a pair or cranks which could be split to make one good one?

If not, you might have to pick up a serviceable replacement from Europe.

I've just had a crank re-built myself and I considered the cost cheap at £300. This included seals, main bearings, con rods and big end bearings.

As Jan said TSI may also be able to help you.

We have two and no good. Found another one which is meant to be okay.

Is it possible to buy a new crank ?
Or just the webs ?

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Re: Kawasaki KR1S

Post by maccas » Mon Nov 18, 2013 3:18 pm

2stroke wrote: Is it possible to buy a new crank ?
Or just the webs ?
New cranks used to be available but I would have thought they will be NLA now. New webs are not available either.

Using second hand serviceable webs is your best option (if you can find any).

I had my crank rebuilt in the UK by Grampian Engineering. My crank needed a web and they had a useable second hand one in stock. Cost was £330 GBP including the useable web and fitting a new BDK centre pin too.

Dan

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Luders
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Re: Kawasaki KR1S

Post by Luders » Mon Nov 18, 2013 7:55 pm

Post a thread under the parts wanted section requesting a serviceable crank.

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Re: Kawasaki KR1S

Post by 2stroke » Mon Nov 18, 2013 8:22 pm

maccas wrote:
2stroke wrote: Is it possible to buy a new crank ?
Or just the webs ?
New cranks used to be available but I would have thought they will be NLA now. New webs are not available either.

Using second hand serviceable webs is your best option (if you can find any).

I had my crank rebuilt in the UK by Grampian Engineering. My crank needed a web and they had a useable second hand one in stock. Cost was £330 GBP including the useable web and fitting a new BDK centre pin too.

Dan
Thanks Dan.
Yeah that's where we are at now.
Maybe one day someone will make the webs.

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