Hello all, I purchased a NC29 today which seems to be in good mechanical health, however it came with a certificate to prove it had a 33bhp kit installed. The previous owner is unsure whether the kit is still in place. Is there a sure way to tell and also how to remove the restriction in place please?

The certificate states the device is a blade, device code B2-NC29-K25, details and dimensions are:

Outer diameter = 38mm
Inner diameter = 17.3mm
Inner diameter = 13mm

Any advice would be appreciated thank you.

They are basically large washers, a metal plate with a specific size/shaped hole in the middle, fitted between the carbs and the cylinder head. Whip the airbox off, open the throttle, move the sliders across and look through the carbs. Should be able to see them if they are there.

Thank you very much, will try that tomorrow.

The other way, is if it runs out of puff at about 160-170km/h then it's restricted, if it pulls through to 180km/h+ it's not. If it hits a brick wall at 180km/h, it sill has he electronic top-speed limiter, otherwise should clear 190km/h. On a private road

rev it in neutral,, if it sounds spluttery, its restricted.. its the lack of fuel going through

DK-Tandy wrote:rev it in neutral,, if it sounds spluttery, its restricted.. its the lack of fuel going through

I'm not sure about that. The restrictor restricts air, he fuel then matches the restricted air. At no point is/should the bike be running lean. The restrictors will cause turbulence in the intakes though, which the bike won't like particularly at tickover.

amorti wrote:

DK-Tandy wrote:rev it in neutral,, if it sounds spluttery, its restricted.. its the lack of fuel going through

I'm not sure about that. The restrictor restricts air, he fuel then matches the restricted air. At no point is/should the bike be running lean. The restrictors will cause turbulence in the intakes though, which the bike won't like particularly at tickover.

something like that.. it doesnt soun like it should it what i was basically saying.

after you fish them out...
Sell them on this site or ebay... loads of people are after those washers..
put the money towards samat else for the bike

leopard_pagan wrote:after you fish them out...
Sell them on this site or ebay... loads of people are after those washers..
put the money towards samat else for the bike

If it's got any in there!
I thought my CB-1 was restricted when I got it... turns out, it just felt very slow after a year on a 955i Daytona!

bit like my van being slow after getting off my bike....