KR1S 250cc HELP

TIGGER · L Plate Warrior Joined: 14 Jun 2005 Karma :

HI ALL, I HAVE JUST GONE AND GOT A BIKE, A VERY NICE KAWASAKI KR1S THAT DOSE NOT WORK. WOT I NEED TO KNOW IS - IS THERE ANY GARAGES AROUND DAGENHAM THAT WILL WORK ON THIS BIKE,I HAVE TRYED JOHNS OF ROMFORD ALL THEY SAID WAS IT WAS TO OLD FOR THEM TO WORK ON, AND I WAS TOLD THE SAME BY HYSIDE IN COLLER ROW,SO I NEED SOME HELP SO IF ANY OF YOU KNOW A GARAGE OR A VERY NICE MAN THAT CAN SORT OUT THIS TYPE OF BIKE PLEASE LET ME KNOW, THANKS FOR ANY HELP YOU GUYS MIGHT BE ABEL TO OFFER.
PLEASE EMAIL [email protected]
THANKS AGAIN TIGGER

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

NO NEED TO SHOUT!

If you get stuck, the place nationally to get your 2-stroke sorted out is Stan Stevens. Anything from an overhaul to a balls-out full race tune.

Can be heavy on the wallet though, but a KR1S is an expensive toy to keep on the road in any case.

https://www.stanstephens.com/
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

tatters · Exxon Valdez Joined: 05 Jan 2004 Karma :

there not too old to work on Confused

whats wrong with it, why does it not run?
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

TIGGER · L Plate Warrior Joined: 14 Jun 2005 Karma :

hi guys, thanks for the info i will give that stan stevens a call to see if he can sort it out or advise me,
the bike is running but it loseing power when you change up gears and stalls when left on tick over,it was leaking petrol out of the over flows but i took the carbs apart and found a bit of grit in the flots so this has now stoped, it will only run when you leave the tank tap in pri setting or i should say it runs a bit better in pri setting, it is very flat when pulling away, and some times i seem to lose a cyinder,yesterday it was the right hand one and today thats working and the left one cut out, still wot can you do ? i should have kept the car? not, or mabey got a 4 stroke. almost forgot to say it also only runs with the choke out. if anyone has any idears or info please let me know.
thanks again chaps
all the best tigger

tatters · Exxon Valdez Joined: 05 Jan 2004 Karma :

Change the spark plugs.......

Then sell the bike to someone who know how to look after a high performance 250cc two-stroke. you shouldn’t own a bike like a KR1 unless you know what you are doing, they are very fragile and dangerous bikes when they are not looked after or rode correctly.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

TIGGER · L Plate Warrior Joined: 14 Jun 2005 Karma :

o,come on i ant that bad,the plugs have been changed,the carbs have been stripped and cleaned, the last bit about selling it you might be right,
cheers any way tigger

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Check the fuel filters (including the crude one in the tank). Drain the fuel tank and check there is not water in the bottom of it. Balance the carbs. Check that they have sold you the right plugs.

Also, not sure about the KR1S, but the KIPS power valve on the old KMX125 was apparently easy to reassemble so that it worked in reverse (giving high rev port timing at low revs and low rev port timing at high revs). Not likely but could cause hours of bafflement it that has happened.

The bike might need more than that, but generally give everything a good clean out first.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

TIGGER · L Plate Warrior Joined: 14 Jun 2005 Karma :

hi keith,thanks for that,i have done most of the above, ie drain the tank/new filters fitted, iwill try the power valve thing this weekend and let you know how it goes,also i will check the plugs to make shure that they are the right ones.
thanks again tigger

tatters · Exxon Valdez Joined: 05 Jan 2004 Karma :

when the KIPS vavles are set up wrong or loose they don,t really effect the bike till 8,000 (7,000 with the KR1), its always good to de-coke them ever thosand and check postions every 100-300 miles (they love to un-screw them selfs, and the vavles/linkages are very expensive).

if you do take the linkages apart: short linkage goes between the centre two vavles, and the cap whch sits on top the the vavles should have the screws entering through the countersunk side and through the shaped side of the vavle. this is how they should be set up.

a few small notes about the bike:

pistons should be changed every 10,000 miles

only run on fully sysnefectic two-stroke oil (TTS for example)

get a steering damper/bracket for it

KR1 runs on BR9ES and the KR1S runs on BR10ES plugs

these guys are one of the very few who still stock alot of KR1S parts https://www.cradleykawasaki.co.uk/

the only differents between the KR1 and the KR-1S are the: frame/wheels/top end/swingarm/fairing/exhausts/moment KIPS vavles open/KR-1S is faster.

a on-line workshop manual for both the KR1 and the KR1S can be found at: https://turing.une.edu.au/~ashley/kr1/

and there is a very good KR1/KR-1S forum: https://www.kr-1s.net/forum/
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

stevo as b4 · World Chat Champion Joined: 17 Jul 2003 Karma :

AFAIK the KR1/S uses an electrically operated KIPS valve system, instead of mechanical. The KMX can be assembled wrongly, but there are punch marks in the top of each valve drum, that should align with the front of the operating rack, when its assembled correctly.

I agree with previous comments, that if your not very mechanically minded or have much experience of performance 2strokes its best not to have a a bike like a KR1. If you do manage to get it running a bit better it could still be dangerous, and id never trust an old nearly race tuned 2stroke, without giving it a full re-build first. Theres nothing worse than distrusting an old 2stroke and having to ride around paranoid with your hand over the clutch all the time!
Hell it'd be enough to make me want to buy a 4stroke almost! Laughing

TIGGER · L Plate Warrior Joined: 14 Jun 2005 Karma :

thanks a lot tatters,very helpful posting,the web sites are great, just wot i needed,also thanks to steve,i will be puting the bike into stan stevens as soon as i can,for a full rebuild,so i will be a few quid lighter but the bike is so nice im shure it will be worth the money, i would just like to thank you all for you help with my bike.
and hope to report about the bike when its done.
thanks again tigger.