Hard to start issues

[mxpimp2000]

well since ive went to kick start only setup i have alot of trouble starting the bike when its hott. It will start relatively easy when cold but i do have to barley push in the throttle about 1/8-1/4 for it to fire up. it wont start by just kicking it and no gas. ive tried messing with the jetting pilot jets and cant ever get it right or could it be my valves? it has been awhile since ive had a valve adjustment but never had any issues with ticking or makin any noise.

someone has to have a starting point

[Ride1Rob]

Could be your valve lash. YFZ's have quite a bit of noise from the valve train as is so you won't hear much difference unless they get really bad. Normally, valves out of spec makes it hard to start while hot.

[mxpimp2000]

it seems to make some noise when it gets hott. i noticed it when i replaced my topend and didnt have my shim kit at the time to do them. but i will look into it now that i bought a kit. is it + or - 2 on the clearence? some ppl say + or - 4

[Ride1Rob]

As your valves wear it actually causes the valves to get tighter. It's kinda weird but I'll explain. As the face of the valve in the combustion chamber loses material it seats lower. This raises the valves stem higher against the cam lobes, caps, etc... Thus, there's less clearance and less noise as the lobes rotate across the cam caps. Hope that didn't confuse you too much lol.

[mxpimp2000]

what should my clearences be between? like no more than? and no less than?

[yfzrider690]

Originally posted by mxpimp2000
what should my clearences be between? like no more than? and no less than?

The intake clearance is .10 - .15 mm(.004 - .006 in)
The exhaust clearance is .20 - ..25 mm(.008 - .10 in)

[ohsobad_chevy]

I always set em at 6 and 10, like R1R mentioned, they tighten up with time.

[mxpimp2000]

i checked my valves a week or 2 ago and the intake was really tight. i remember 1 or 2 valves you couldnt fit the feelers in i will have to re check them and let you know what i come out with

[standardryder]

Do you have a hot start? Before I got mine if it was hot I'd kick for days. Now, first kick, hot or cold.

[mxpimp2000]

Originally posted by standardryder
Do you have a hot start? Before I got mine if it was hot I'd kick for days. Now, first kick, hot or cold.

na i dont have one

[mxpimp2000]

Originally posted by standardryder
Do you have a hot start? Before I got mine if it was hot I'd kick for days. Now, first kick, hot or cold.

do you really think it would help mine? im looking into this

[standardryder]

I know I'm glad I put one in mine. It would honestly take 5 minutes of kicking to get it to fire without it. Its cheap and easy to do so it couldn't hurt.

[hendershot106]

Originally posted by mxpimp2000
na i dont have one

you are wasting your time kicking a hot quad without a hot start carb.... you might as well bump start it... You can adjust the jetting all you want.... but until you buy a hot start carb.... your wasting your time.... been there with the same problem, 07,08 race bike..... i didnt want to spend the money on a carb just for a hot start... every time i stalled it... it wouldnt start...

[standardryder]

A stock YFZ carb is pre-bult for a hot start. All you need is the lever and cable.

[mxpimp2000]

Originally posted by hendershot106
you are wasting your time kicking a hot quad without a hot start carb.... you might as well bump start it... You can adjust the jetting all you want.... but until you buy a hot start carb.... your wasting your time.... been there with the same problem, 07,08 race bike..... i didnt want to spend the money on a carb just for a hot start... every time i stalled it... it wouldnt start...

yeh stock carb has a hot start its just pluged off. a cable and lever is all id need but cant find a +2 hot start cable for mine

[hendershot106]

Originally posted by mxpimp2000
yeh stock carb has a hot start its just pluged off. a cable and lever is all id need but cant find a +2 hot start cable for mine

get a dirt bike cable...... or go to a yamaha dealer and start measuring cables lol

[mxpimp2000]

Originally posted by hendershot106
get a dirt bike cable...... or go to a yamaha dealer and start measuring cables lol

nice! if only they have em in stock would be the catch

[hendershot106]

Originally posted by mxpimp2000
nice! if only they have em in stock would be the catch

Lol....find a big dealer... or try calling Baldwin.... he always knows that stuff like that.....