Search found 468 matches

by James P
Thu Oct 18, 2018 6:46 am
Forum: KR-Kive
Topic: Cycle Sounds Magazine, January 1988
Replies: 2
Views: 70

Cycle Sounds Magazine, January 1988

I found this magazine which had a feature on the launch of the KR-1 and the associated Formula 3 kitted machine (KR003). I have scanned the original article and added translation pages at the end. I translated the article and photo captions as best I could using Google Translate (and my kanji & kana...
by James P
Tue Oct 02, 2018 11:33 am
Forum: Engine
Topic: boggy running between 3-5k at 1/4 throttle
Replies: 5
Views: 162

Re: boggy running between 3-5k at 1/4 throttle

Is the poor running more related to engine speed, or to throttle position? Are the needles new because the original ones were worn? If so, could the needle jets be worn also? My own KR-1 (basically standard except for KR-1S pipes) runs better with the needle clips in position 2 (i.e. second from top...
by James P
Tue Oct 02, 2018 11:19 am
Forum: KR250 Chat
Topic: Hoping to buy a KR250 - what do I need to know?
Replies: 17
Views: 617

Re: Hoping to buy a KR250 - what do I need to know?

If the part numbers of the vital parts (cylinders, heads, ignition, exhausts etc are identical for the Japanese and export versions then perhaps all KRs really had 48 hp and 45 was a figure released for the Japanese market to "comply" with local regulations. I'm convinced it is the same thing with ...
by James P
Sat Sep 22, 2018 10:32 am
Forum: KR250 Chat
Topic: Hoping to buy a KR250 - what do I need to know?
Replies: 17
Views: 617

Re: Hoping to buy a KR250 - what do I need to know?

The KR250 was originally sold new in Australia too, so you can usually find a selection of parts on Ebay Australia. I don't check regularly, but at times have seen a fairly large selection of bodywork, engine and chassis parts.

Regards,
James
by James P
Sat Aug 04, 2018 11:12 am
Forum: Engine
Topic: KMX oversized piston.
Replies: 7
Views: 891

Re: KMX oversized piston.

The 200 fits the 125 cases and the crank is the same 54.5mm part too. Its just stuff like the carb, radiator and clutch that are different, and I've got upgrades for all those ready too. The only problem is if I fit the 200 top end on this engine, the custom pipe I've got won't really work, and I'v...
by James P
Wed Jul 18, 2018 2:26 pm
Forum: Engine
Topic: KMX oversized piston.
Replies: 7
Views: 891

Re: KMX oversized piston.

a sleved one is always inferior, not matter how good the job has been done. because of the lesser heat dissipation between sleeve and cylinder. don't think it will matter much in one "underpowered" KMX though. Yes Jan - I agree. As you point out, the cooling "inferiority" of a sleeve may not be not...
by James P
Wed Jul 18, 2018 1:38 pm
Forum: Engine
Topic: Squish clearance and compression ratio - advice please!
Replies: 31
Views: 3380

Re: Squish clearance and compression ratio - advice please!

Please could someone tell me what the standard piston dome radius is... I'm not sure if you still need this info, but the dome radius of a standard piston is about 120mm. I found it difficult to measure with accuracy, as I could only use a profile gauge to get a trace of the dome profile, then comp...
by James P
Mon Jul 16, 2018 2:18 pm
Forum: Engine
Topic: KMX oversized piston.
Replies: 7
Views: 891

Re: KMX oversized piston.

You will have to add the cost of modifying the head to the cost of the bigger bore cyinder and piston unless you can do the work yourself, plus the cost of a non-standard head gasket if it isn't included with the 56 mm cylinder and piston. This may or may not be cheaper than finding a standard bore...
by James P
Fri Jun 15, 2018 11:55 am
Forum: Chit Chat
Topic: SP/F3 kit steering stopper
Replies: 5
Views: 635

Re: SP/F3 kit steering stopper

is all i have from a saved web page... can probably scale photo off parts sticker Thanks for that Danny - I have those same photos from when an SP or F3 kit was split up on Yahoo ages ago! I even put a bid on the steering stopper from that lot, but the price went higher than I thought it was worth ...
by James P
Sat Apr 14, 2018 8:59 am
Forum: KR250 Chat
Topic: KR250A custom for sale in Japan...
Replies: 2
Views: 613

KR250A custom for sale in Japan...

Saw this tidy KR250A for sale on Yahoo Auctions:

https://page.auctions.yahoo.co.jp/jp/auction/g263576977

Fitted with ZXR250C wheels and forks.

Regards,
James
by James P
Wed Apr 04, 2018 12:10 pm
Forum: Chit Chat
Topic: SP/F3 kit steering stopper
Replies: 5
Views: 635

SP/F3 kit steering stopper

This may be a long shot; Does anyone have the steering stopper from the 1988 SP/F3 kit (Part No.32085-1303)? I want to try to make one of these or something similar, but dimensions would be handy! I have taken most of the measurements directly from the frame to create something similar, but I would ...
by James P
Wed Apr 04, 2018 11:58 am
Forum: Chit Chat
Topic: Kr1 b1/b2 Rear wheel clip
Replies: 26
Views: 2240

Re: Kr1 b1/b2 Rear wheel clip

It seems that this happens often with a certaian person. I don't know why as I have never met him. But their seems to be a problem with him. I have a idea why he is the way he is Martin, Since your comments were made directly underneath my post, are you possibly referring to me...? What exactly do ...
by James P
Sat Mar 17, 2018 5:27 am
Forum: Chit Chat
Topic: Kr1 b1/b2 Rear wheel clip
Replies: 26
Views: 2240

Re: Kr1 b1/b2 Rear wheel clip

The rear axle nut thread is M16x1.5 isn't it (I haven't got mine on hand to confirm)?? If so, and you can't get hold of one of these special clips, you could try using a Lambretta engine pivot shaft nut. These are shallow M16x1.5 Nylock nuts (about 12mm tall in total), so shouldn't come off if they ...
by James P
Sat Mar 17, 2018 4:38 am
Forum: Engine
Topic: Balance shaft rebuild?
Replies: 6
Views: 744

Re: Balance shaft rebuild?

Joe439 wrote:
Fri Mar 16, 2018 5:58 pm
What seal and bearing to use on it.
Joe,

See my reply under a previous topic: http://kr-1s.co.uk/forum/viewtopic.php?f=1&t=13790

You could modify "normal" 6303-C3 bearings and you could also perhaps use a 23-47-7 seal with a 0.7mm spacer.

Let us know what you end up doing!

Regards,
James
by James P
Tue Aug 15, 2017 7:48 am
Forum: KR Bits and Bikes Wanted
Topic: Wanted Rear kr1s mudguard
Replies: 3
Views: 913

Re: Wanted Rear kr1s mudguard

Here are a couple from Japan if you can't find anything closer to home:

https://page.auctions.yahoo.co.jp/jp/auction/n224432701

https://page.auctions.yahoo.co.jp/jp/auction/m203252339

Regards,
James