honda nsr jc20 rc valve motor

[jc20steve]

hi peeps

I recently brought a honda nsr 125 jc20 import took it for a ride the other day it felt gutless it wouldnt rev over 6000 rpm smoked alot compression is fine ect. so i checked the rc valve motor it wasnt turning atall stuck closed on the exhaust port

so my question is because all the jc20 parts are gettin hard to find will the fox eye rc valve parts fit

and if anyone dose have the proper jc20 parts for sale ie servo motor and the tv78 unit please contact me

all the best peeps steve

[st3v3]

There's usually a few knocking about on Ebay here and there?

After a little online research it seems they share engine bits, frame is obviously different but for powervalve related issues you should be ok?
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Roger wrote: Women don't get damp for clingy puppies. Get some better happy pills, hit the gym & buy a medallion the size of a dinner plate. Job done

[alan1966]

sonds like your splines worn you can get parts for nsr at david silver no probs
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ALAN1966

[alan1966]

sonds like your splines worn you can get parts for nsr at david silver no probs
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ALAN1966

[alains]

about the parts , you can exchange engine spares but not the RC/valves system including the controlers
to be sure about the electronics you should do first :
- unplug the servo-motor
- with multipliers catch the pulley and turn it as far as you can to set the valves in HI position (max openning)
- take a run and see how it goes (normally you should reach 11000 rpm in 4th gear)
if it's OK , now re-plug the servo-motor and dismount the cables from the pulley (living the valves on HI & remember where cables are set on the pulley)
download my file https://www.geneva-racing.ch/~alains/NSRtips.doc , look bottom page #10
start engine and observe the pulley while accelerating up to 8000 rpm . if the sequence is correct , your valves are stocked in the exhaust port and your engine needs de-coke with rings change (eventually piston or cylinder-piston kit)
if not , could be the CDI , RC/valves controler or the servo-motor
checking the servo-motor is easy
feed quickly (max 1s) from the battery between white & white/black and if it works reverse polarities
if OK both ways your servo-motor is OK
for the CDI & RC/valve controler it's quit impossible but very often loose contact on the red/white makes this problem
good luck on your quest (keep me inform)
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the worst day fishing is better than the best day working

[jc20steve]

also a quick question

what will happen if i compleatly remove the valve ect

cheers steve

[alains]

nothing much , just will be scrapy to reach 7500 rpm , then you will get the power . the RC/valve system ease the engine to overcome the inertia until the max torque will be reached and remember that this bike is accurate when it's warmed enough (takes generaly 5-6 mn)
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the worst day fishing is better than the best day working