Search found 144 matches

by Professor
Thu Sep 27, 2018 9:48 pm
Forum: Engine
Topic: Head gasket failure causes
Replies: 6
Views: 228

Re: Head gasket failure causes

With the water jacket you would also need to seal the power valves and use copper or dowty washers to seal the head bolts, I can see why sealant is easier short term choice.

Any one with a scrap head spare?!
by Professor
Thu Sep 27, 2018 9:35 pm
Forum: Engine
Topic: Head gasket failure causes
Replies: 6
Views: 228

Re: Head gasket failure causes

An easy service to machine the heads to suit orings would be good :) much easier and cheaper to work on and long reusable lifespan of Viton orings. Do you use an oring or two around the perimeter for the water / coolant jacket as well? this is more likely to need a cnc mill to machine an irregular g...
by Professor
Tue Sep 25, 2018 9:53 am
Forum: Engine
Topic: Head gasket failure causes
Replies: 6
Views: 228

Head gasket failure causes

I think different cylinder heights are likely to cause head gasket failure and creeping of base gaskets. I've measured mine after having problems with the base gaskets slipping out and found heights were 0.35 different! I recently had one replated and the top of the cylinder was linished slightly co...
by Professor
Tue Feb 20, 2018 11:27 pm
Forum: Engine
Topic: Tonnage for crank press ?
Replies: 3
Views: 491

Re: Tonnage for crank press ?

A 5 to 10 ton press is just about adequate for most 2 stroke cranks if you have a good square hold. the more powerful the press the more control over pressing it back together you should have for position. The KR1S crank wants a few specific shaped plates to help press it apart without damaging it S...
by Professor
Sat Jun 03, 2017 11:23 pm
Forum: Steering and Suspension
Topic: Fork Strip Problem
Replies: 5
Views: 1362

Re: Fork Strip Problem

Normal Loctite will need about 160C to melt it, it takes time for the heat to penetrate so be careful. An infrared thermometer is useful

You could also try gently hammering the rod bolt with a length of hex bar to help loosen it?
by Professor
Tue Mar 07, 2017 9:51 am
Forum: Engine
Topic: Piston failure
Replies: 4
Views: 1144

Re: Piston failure

I had a piston ring pin break on a genuine piston, recent updated type. The ring turned until it broke slightly and jammed in it's groove, luchily didn't cause a sieziure or much damage.

I just put it down to too many trackdays! about 8 or more with out changing them?!
by Professor
Tue Mar 07, 2017 7:04 am
Forum: Brakes
Topic: Alternative Front Brake Master Cylinder
Replies: 13
Views: 2291

Re: Alternative Front Brake Master Cylinder

I've fitted a Brembo aftermarket radial master cylinder to my KR, works very nicely and is very well made. Did you have two simple brake hoses fitted? this makes it a little easier bleeding than the original setup of 3 pipes with a splitter. You could clean out the original master cylinder and fit a...
by Professor
Tue Mar 07, 2017 6:53 am
Forum: Steering and Suspension
Topic: Front fork airgap
Replies: 6
Views: 1596

Re: Front fork airgap

Sounds like they might have some handy old stock!

Will give them a call when I'm looking for next pair :)

Cheers
by Professor
Wed Feb 01, 2017 11:12 am
Forum: Steering and Suspension
Topic: Front fork airgap
Replies: 6
Views: 1596

Re: Front fork airgap

Where did you manage to find some linear fork springs from for the KR1S? quite difficult to find the correct size in correct rate.

An air gap of 160 or 140 works well, depending on purpose of use and rider weight etc. measure the oil level with the emulator in.
by Professor
Sun Sep 11, 2016 1:03 am
Forum: Engine
Topic: getting ready for cadwell...
Replies: 4
Views: 1282

Re: getting ready for cadwell...

I've had a ring peg break before, just think I did too many trackdays on one set of pistons. That was genuine pistons but 8 or more trackdays!

Luckily didn't cause much damage to mine at the time but cut short the trackday.
by Professor
Sun Sep 11, 2016 12:53 am
Forum: Steering and Suspension
Topic: Dunlop tyres
Replies: 9
Views: 2954

Re: Dunlop tyres

Thanks for the very helpful information KRackerS =D>

Are they still pricy even in Japan?

Yes the H rated tyres are better for smaller bikes and will work well on the KR1S, the H rated construction should be lighter or thinner to suit lighter and less powerful bikes.
by Professor
Sun Sep 11, 2016 12:35 am
Forum: Chit Chat
Topic: Just a couple of questions ?
Replies: 5
Views: 1174

Re: Just a couple of questions ?

If you want to improve the original forks you could fit cartridge emulators (makes comp damping internally adjustable)and stiffer straight rate springs to suit your weight and purpose. People on this forum have fitted a donor cartridge into the original forks also. Tricky to get optional springs for...
by Professor
Sun Jul 10, 2016 11:35 pm
Forum: Engine
Topic: Crank rebuild
Replies: 9
Views: 1945

Re: Crank rebuild

I used Colin Applebee once years ago and never again...... He replaced the rods which I asked not to be, I specified details verbally and in writing but ignored!! crank wasn't aligned accurately and he reassembled the webs in non original order and then tried to cover it up. Tosser all round in my o...
by Professor
Sun Jul 10, 2016 11:14 pm
Forum: Engine
Topic: Gasket between crankcase and generator casing - 11009-1757
Replies: 6
Views: 1279

Re: Gasket between crankcase and generator casing - 11009-17

I'm sure it's more likely to be a EMF shield to stop interference from the balance shaft with the timing pickup coil. Could be quite important for low rpm timing
by Professor
Sun Jul 10, 2016 10:47 pm
Forum: Chit Chat
Topic: Resonant Spacers.
Replies: 10
Views: 1846

Re: Resonant Spacers.

Did you use a second gasket to seal the extra spacer with 27mm longer bolts?

I wonder if there is any way of calculating the optimum volume for the resonating chambers?!

I've heard of people using them on mx and enduro two strokes with good results.