Restricting a KR1 to 33bhp.

[thefallenange...]

Hi

i've been given some advice about the restriction kit required for these which is 2 36mm diameter washers which i should be getting on monday and fitting. The only problem is i wondered if someone had a quick step-by-step advice on how to do it. Nothing too informative but a rough guide.

Any help is appricated. to FI, £200 for a "Certificate".
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Past - CG125 ,KR1S, SV650s, Street Triple R - Current - Duke 390

r.bridge1988@gmail.com

[Blau Zedong]

A highly tuned 2t like a KR1 or RGV will be absolutely horrible with an artificial restriction. Not a good move to pick one as a 33bhp bike at all.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[MarJay]

Not exactly the most reliable bike in history, and then you are going to restrict it with some washers in the carbs.

Probably not the best thing to do to a highly tuned 250cc 2t, especially as thrashing the nuts off of it is about the only thing that will keep it alive.

I suspect if you get it dyno'd the operator might not open the throttle all the way if you ask him nicely, and then you'll have proof of 'restriction' and your bike won't be strangled.

Incidentally is this a day to day bike?
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[thefallenange...]

[MarJay]

[Blau Zedong]

[quote="MarJay]
Fair enough, but I'd still look for a kindly dyno operator if I were you... [/quote]

And get shares in NGK
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[thefallenange...]

[MarJay]

[Blau Zedong]

The simple fact is that strokers, despite the fact that they make kits for them, do not handle artificial restriction very well at all. I'm going to be brutal and suggest you buy something else if you have to be restricted to 33bhp, your tenure with a 33bhp KR1 will not be very pleasant.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[MarJay]

[cagiva gezzer]

Restricting the intake / exhaust will mess up the jetting and it'll be a B.O.S to ride and foul plugs.

You're best bet is to reduce the travel of the throttle by putting a stop in the top of the carb
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"because one stroke isnt enough and four strokes waste two"

[thefallenange...]

[cagiva gezzer]

You find a friendly dyno place. They run it up and note how much throttle produces "~33bhp". They then make a spacer that fits in the top of the carb to restrict the slide movement. Or they drill & tap a hole and run a bolt down it.

Either way, cost my mate <£50 to have his nordwest restrcted like this.
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"because one stroke isnt enough and four strokes waste two"

[thefallenange...]

[RS1Banger]

dont they have a couple of KIPS powervalves you could peg shut?
in the same way you would on a 125

[JonB]

I doubt it would be worth the hassle to be honest. Considering 2 strokes pull most of their power in the powerband higher up the rev range I can imagine you just having a really bogged down bike with nothing at low revs really. Though it could be a bit better on a 250 obviously.
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Be careful whose advice you buy, but, be patient with those who supply it. Advice is a form of nostalgia, dispensing it is a way of fishing the past from the disposal, wiping it off, painting over the ugly parts and recycling it for more than it?s worth.

[stevo as b4]

[SplaTZXR400]

ye i agree, find a nice dyno. my mech just taped up the air intake, printed a sheet of 33bhp and a cover note. job done.