Search found 2959 matches

by JanBros
Fri Aug 17, 2018 5:38 pm
Forum: Projects
Topic: The special one ...
Replies: 13
Views: 265

Re: The special one ...

tnx.

back bruised, stil not very flexible and hurts when trying.
by JanBros
Sun Aug 12, 2018 2:32 pm
Forum: Projects
Topic: The special one ...
Replies: 13
Views: 265

Re: The special one ...

Glad you are OK, Must be all the practice that you are getting good at crashing. Good to see the bike being used and you will have it fixed up in no time 8) back still hurts, was during 2 weeks of vacation, but I don't think I'll be back at work tomorrow or the entire week. practice is always good ...
by JanBros
Sun Aug 12, 2018 2:29 pm
Forum: Projects
Topic: The special one ...
Replies: 13
Views: 265

Re: The special one ...

uploaded them myself now
by JanBros
Sun Aug 12, 2018 9:06 am
Forum: Projects
Topic: The special one ...
Replies: 13
Views: 265

Re: The special one ...

topic should have been in chit-chat.

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by JanBros
Sun Aug 12, 2018 12:17 am
Forum: Projects
Topic: The special one ...
Replies: 13
Views: 265

Re: The special one ...

podman wrote:
Fri Aug 10, 2018 9:49 pm
Remind me NOT to go for a ride out with you when we get over to Belgium next year... :wink:
:cry: :cry: :cry: :cry:
by JanBros
Thu Aug 09, 2018 9:41 pm
Forum: Projects
Topic: The special one ...
Replies: 13
Views: 265

The special one ...

... no, not that overpayed portugese version :mrgreen: http://users.telenet.be/jannemie/1.jpg the scene : http://users.telenet.be/jannemie/2.jpg just a tiny bit of too much braking into the corner and the front was gone. the black mark in the middle of the street is from my blocked tire, ther were o...
by JanBros
Sat Jul 28, 2018 10:15 am
Forum: Engine
Topic: Squish clearance and compression ratio - advice please!
Replies: 31
Views: 3107

Re: Squish clearance and compression ratio - advice please!

ok, just measured a KR1 piston :

crown height is 3mm
gives a radius of 132.17
with 0.8mm squish gives a tangent angle of 12.6°
parallalel squish would be 10.4°
by JanBros
Thu Jul 26, 2018 12:46 pm
Forum: Engine
Topic: Squish clearance and compression ratio - advice please!
Replies: 31
Views: 3107

Re: Squish clearance and compression ratio - advice please!

for performance it is better to have parallel squish (and no radius at the edge of the bowl, Jan Thiel has tested this extensivly at Aprilia) . I only put tangent as a possibility as that is what some people want. 17° surely is a lot :shock: from memory mine are amways arroung 10° but it all depends...
by JanBros
Tue Jul 24, 2018 11:13 pm
Forum: Engine
Topic: Squish clearance and compression ratio - advice please!
Replies: 31
Views: 3107

Re: Squish clearance and compression ratio - advice please!

sorry Scooble, maybe my figures are wrong . Have to check why, maybe they are from my YZ125 piston's. place the piston you are going to use on it's head, and measure the distance from the floor to the piston crown. In my new calculator, select height and enter the measured height, and it will give y...
by JanBros
Fri Jul 20, 2018 4:42 pm
Forum: Chit Chat
Topic: KR1S tyres
Replies: 13
Views: 445

Re: KR1S tyres

haven't tried that combo, but have used about anything I had lying arround/available at the time and never had a bike doing "weird stuff". Even radial/diagonal combinations.
by JanBros
Wed Jul 18, 2018 11:29 am
Forum: Chit Chat
Topic: Trackday preparation
Replies: 25
Views: 932

Re: Trackday preparation

doing trackdays with original plastics isn't the greatest idea ;-)
by JanBros
Mon Jul 16, 2018 10:58 pm
Forum: Engine
Topic: KMX oversized piston.
Replies: 7
Views: 430

Re: KMX oversized piston.

Is there a particular reason why you don't want to use the sleeved cylinder? Although sleeved cylinders are generally regarded as inferior to plated ones, it may be of no consequence if the job has been done correctly. a sleved one is always inferior, not matter how good the job has been done. beca...
by JanBros
Wed Jul 11, 2018 6:08 pm
Forum: KR250 Chat
Topic: Kr 250 A Blowing smoke using gear box oil quick
Replies: 28
Views: 727

Re: Kr 250 A Blowing smoke using gear box oil quick

TurboStew wrote:
Wed Jul 11, 2018 12:45 pm
But these engines do end up sucking the oil from the gear box in to the crankcase. The pressure fluctuates and become a negative pressure/vacuum to draw the air and fuel in to the engine.
only when the seal is no longer sealing ;-)
by JanBros
Tue Jul 10, 2018 11:58 am
Forum: KR250 Chat
Topic: Kr 250 A Blowing smoke using gear box oil quick
Replies: 28
Views: 727

Re: Kr 250 A Blowing smoke using gear box oil quick

you always have a circular spring on one side : that side must go to the side with the highest preasue. the spring delivers a primary pression on the seal, the higher the preasure behind the seal the better the sealing because the higher preaure pushes extra on the seal. so in your case : to the cra...
by JanBros
Mon Jul 09, 2018 11:20 am
Forum: KR250 Chat
Topic: Kr 250 A Blowing smoke using gear box oil quick
Replies: 28
Views: 727

Re: Kr 250 A Blowing smoke using gear box oil quick

no need for a new shaft, have new retaining blocks welded on. make sure the shaft is heated as much as possible before welding spots on the blocks. file them down so the gear can pass, they do not have to be perfect or have the same shape as the rest, just big enough to retain the clip.