hi guys, i took out my carbs & changed o-rings. make it short. after i put it back, once i start engine, rpm shoot to 10k rpm, stay there, i off it straight. tried few times still the same. what happened?? pls help! i only unlatched the whole throttle cable as i was unable to put it back, took few hrs! @ 1st, no.4 carb overflow but after awhile no more. anybody?? took me whole day but still dun know where go wrong? need to do it again this tuesday. pls advice!! choke checked, not pulled.

what could be stucked in the carbs to make the rpm shoot up & stay there?

when i tried to fix the throttle cable back, tried many ways, flip the carbs till both my hands & legs cmi already!
in the end, i took out the whole throttle cable, fixed on the carbs then back on handle. opened up again to double check but looked fine.
i will try to release the throttle cable on handle before i on the engine again but throttle cable dont seem to be the problem, just to make sure. do i have to open up the carbs again????

You need to check that the throttle valves (round brass discs) that are opened and closed by the throttle cable are working correctly, openning and fully closing and that the slides are not sticking open, they should shut on the springs.

Variablevalves suck wrote:You need to check that the throttle valves (round brass discs) that are opened and closed by the throttle cable are working correctly, openning and fully closing and that the slides are not sticking open, they should shut on the springs.

the slides confirm not sticking open. i had my finger on the screw in order to press the hook up to connect the throttle cable in the 1st place, i'm stuck there for 2hrs ! once let go, shut off, the springs were fcuking strong. now my finger pain & numb. in the end, then i took out the whole cable, that fix it! thought could start tuning but no. but now the cable has no more freeplay, how do i adjust freeplay? i'm going to try again on tues. screws were damaged, unable to open, had to rush to shop, pay them to do, then rush back.
i'm also stuck @ the slide holder for hrs, totally unable to push out. i'm really fcuk up. i unscrew the brass nut & pushed the emulssion tube out but also unable to put it back!! it was too tight fit, man! using fingers was impossible. should the emulssion tube be so tight fit? maybe cos mine has been there for more than 10years...
VVS, the o-rings for the main jet. what's the proper way to install? i mean, roll it all the way in the jet then screw the jet in, right? what do you guys use as a temp fuel tank to supply fuel to carbs as we need to tune with no tank? i tried a container, drilled a hole, put a shut-off valve. in the end, the valve broke, think not suitable in fuel.

all my time was wasted on these, started @ 8am happy, confident. end @ 6.30pm, tired, unhappy. i only took 3pieces of bread, skipped my lunch, in the end, till evening, i was fully exhausted with an empty stomach!

shop took only 3hrs to take out, wash, put back, tune... i'm really a shame. was my wife's birthday some more. told her i should be back home noon to bring her out but in the end evening then i made it home with nothing, whole place was full of tools, fed up just kick everything aside & took a taxi home. as in singapore we live in flats, we are not allow to do bikes in public as petrol is dangerous so i traveled 25km with it to my workplace to change o-ring+ tune, thought could finish in a day & thats it. what a day for me as a mech, i think my best work timing in it was only taking out fairings. maybe i'll have a better timing this tuesday.

VVS, could air leak causing it to be so high, 8k-10k rpm @ idle? i google & read it but not much detail. could it be air leak where the carbs & engine connects? the rpm was still climbing up, i was scared the engine blow so off it! if the throttle valve is close, how else could the petrol go into the engine & made the rpm stuck there? am i right? i know nuts about how the carbs work, just asking. your inputs are very important to me as i need some directions, i'm totally lost now. i'm hoping more mates here will tell me what could be the cause, so i can troubleshoot it 1 by 1. i'm alone with not much bike knowledge.

my wife said maybe i should just sell it off since its so old & problematic, cost me alot when i always pushed it to shop. it had a damaged concord + piston last year. but i'm not giving up yet.

PM sent.

tried start it again just now. 4th carb overflow, unable to start up, just cranking... this time i think i'm fcuk up.
what could be the cause? sticky float? i think i'll take the carbs out 1 more time to double check.

took the carbs out just now to check on 4th carb. it overflow cos i pulled the floater pin out eariler. when i put back, it didnt hook into the small clip, thats why overflow.
everything was faster this time but by the time i'm ready to start it again, it cranked few times then batt weak!! gave up again, gota look for cable to start it with my car. dare not push start as earlier when it started, rpm shoot to 8k.
hope my luck is coming back...

there's 2 ring like washer & a clip on the jet needle, which ring should be below the clip? is it the flat type or the other 1? & which position should i set the clip @???