*throttle problems STILL.....help me please. bottom of page1

hi, ive been having problems with my throttle sticking ever since i changed to a polini 21mm carb. the throttle cable doesnt seem to be frayed, and seems to be in correctly.

however the float in the carb seems to be getting stuck, i think this is what is causing it to stick. does this float need to be lubriacted and what can i do to stop it getting stuck? can anyone help please

 

clean the float and the inside of the carb with petrol.

I dont no if its a good idea but if its really getting to you id give the slide a light sand paper wash in petrol and put back together

 

yer it kind of is getting to me by now :w00t: mainly coz i go down the road with my mates, set for a good ride out and it just gets stuck on full throttle at the lights :rtfm:

i then start heading home

il give it a go though major, thanks

 

u wud have to shave off the tinyest amount if ure gnna sand it.. not advisable tbh.. i would personally do it.. just give it all a good clean

ben.

 

why should you have to sand anythin down on a new carb?? just give it a good clean and see how it goes.

 

thats what i thought when i first started having problems with the carb. i think the spring which helps push the float up and down needs to be more springy as it doesnt seem to be turning correctly. :w00t:

ill give it a good clean in the morning and see what happens.

the throttle only sticks at slow speeds though

 

if its a brand spanking new carb I dont see how it its any fault with the carb

i think if the carbs be joined up properly you may have dirt in your throttle line, happened to my old mini motos. take the bowl of and check the pin that holds the float (may be bent or hanging out slightly by accident if youve touched it to change the jet)

if the floats right and has a nice bit of play with it, dont sand it or do anything stupid to it. It will be down to the slide/spring/cable or throttle mechanism, nothing else really can hinder the throttle response/ actions

also do you have aftermarket grips? your next plan of attack is to whip the bowl of, check the pin and throttle slide

 

yer wel i was checking what jet i had in before so i had the bowl off. i havent got after market grips on it although i had some new bar ends on which expand to tighten to the handlebars but i took them off today to see if they were causing the cable to be under tension.

its a process of elimination and its definitely what you said.

nice and busy for tomorrow but i just want to get it sorted

you ever had a problem with out like this j-nitro?

 

slightly, kind of.....

fitted the standard slide on my bigger carb because they were the same model (same fittings etc just newer was bigger) however i quikcly relised the newer slide which i didnt change was bigger, blocking off more air flow through the venturi

so when it was idling it was doing like 6,000 rpms revving like fuck, so lesson for you..

always fit every single new part that comes with a new carb e.g. needle, throttle slide

sounds to me mate like youve done a simple tiny mistake which is causing this to happen, the brass pin that holds the float in the bowl square can sometimes go out of its fittings, but usually the float bowl wont screw back on to the carb right as the float wont sit properly at all

which leads me back to my other theory where theres something not right between your throttle mechanism ----- all the down to the needle, i think something is wrong on the way, maybe the slide in the carb the wrong way???

perhaps you havent put the slide in properly so the guiding notch is causing drag on throttle release (sticking), a common mistake that can happen when fitting a carb, Ive done it myself a couple of times before on different peds

infact do that ^^ could be the notch isnt located properly in the throttle slide barrel, make sure it slides down a nice groove, as you would have had to touch this part to change the carb

you will have to have a look for your self and reassemble it but i deffo think thats the problem

 

Re: carburettor

There's your problem right there.

 

Re: carburettor

that was helpful? arc:

 

thanks j-nitro il take a look in a bit and then get back to you.

whereas for zumaman your as much help as your mums fucking gash hair. :rtfm:

 

no problems m8, ive got a strong feeling it may be down to the throttle slide notch not in its groove

also when you take the throttle slide off, full throttle and check how the spring responds, if when you let go off the throttle and the spring goes back to normal (not under pressure) quickly then you know for sure its nothing to do with the cable or throttle mechanism, and im 100% sure if that happens itll be down to the slide situated in the carb

also guide the needle back into the little hole in the bottom of the throttles barrel as you dont want to bend them

try and do it in as much light as possible and take your time make sure your work area is clean and things, as it stops me from losing my rag when i cant solve a tricky problem, garden ornaments can be costly to replace!

 

right ive got an update.

im going to go into detail what the problem is so please read and tell me what you think because i THINK i know what is going on with the throttle sticking.

i start the bike, let it warm a bit. go for a ride and its ok all round really with it revving correctly etc. it is quick

then about 2 miles later i am full throttling it and it doesnt go over 40mph and getting to 40mph takes forever. it seems like the throttle cable just isnt being pulled. i then stop, then set off it then moves a little with very low revs then it sticks on full throttle. i turn the engine off and the throttle feels like there is nothing there. 10/20 minutes later i go back to my bike and the throttle is back to normal. i then go through the same process again :wtf:

i am thinking that the float is sticking half way down the carb and getting jammed or something. once the engine is turned off the slide must be sliding back down very slowly back to its normal position.

i havent changed the throttle cable, could it be because i need a longer one, also what sort of setting should i have the cable at, either under tension or over tensioned.????

someone please help me. (wobbly )

thanks in advance

 

update!!! please read above ^^^^ and please help

 

to me it sounds like your not sure whether the throttle is actually all the way open after 10 or so minutes

(when it struggles to get past 40mph and it feels like theres some left on the throttle cable)

the way to sort this out is to make two dots of tipex on the switch gear (on a rox the one with the electric start) and just next to it put a dot (in line) on the throttle grip when the grip is wound to full throttle, then start the bike and ride it and after 10 minutes, look quikly whilst on the road and see if the two dots are lined up while the throttle is on full....

if they arnt then you know for sure somethings wrong starting along the throttle components (housing, grip, springs etc etc) all the way down to the very end of the line - the needle, again something is wrong on the way, if these two tippex marks dont line up

if they do line up then something is most probably wrong with your transmission, but thats another story

it could be though the adjusting screw on the throttle assembly where you can adjust the throttle cable tension and free play like the brakes on a push bike, check this and set it back to its default settings

 

are you running an airbox or open?

 

right well ive just been changing the throttle tension and the current tension i have it on now seems ok. ive just done 4 miles + without it sticking and i did alot of stopping and starting.

it takes quite a bit to get from 0 to 20mph but then it flies. i believe this will be the clutch springs as wobbly has said before.

il see how it goes, hopefully it wont stick again.

it still does the drop of power when i let off the throttle at speed.

thanks j-nitro, hope its sorted now

 

standard airbox with malossi foam filter in it. why?

by the way i tried the 86 jet today and the bike would hardly move, so ive put the 72 back in.

 

you should have about 5mm play in the throttle twistgrip before it starts to lift the slide in the carb.