250F 2007 Crf250r wont kick start once its warm?

Motomatthew33 · Apr 27, 2017

I recently bought a 2007 crf250r and it started right up and ran great when I was looking at it, but now I have it back at home and after it gets warm and you turn it off it doesn't want to kick start so I have to bump start it every time I turn it off. Its starts first or second kick when cold and runs great otherwise, just doesn't want to kick start once it is warm. What could this mean?

Mihylo33 · Apr 27, 2017

Valves, timing, dirty carb, improper float height, fuel mixture too rich.
Are you using the hot start button when you kick it?

Motomatthew33 · Apr 27, 2017

Mihylo33:
Valves, timing, dirty carb, improper float height, fuel mixture too rich.
Are you using the hot start button when you kick it?

Yea I have tried it with and without the hot start button and still nothing.

2Wheels · Apr 27, 2017

Leaning towards the valves being the issue. Higher engine temp closing the clearance up. check them and rule in/out. Might as well get used to checking them anyhow. Protect your investment.
Welcome to the forum!

Trfsrfr · Apr 28, 2017

I'm gonna go with float height for 100.

Motomatthew33:
Its starts first or second kick when cold and runs great otherwise, just doesn't want to kick start once it is warm.

Just my .02 (and I am no genius, and still learning myself)
So when an engine is cold, it needs a bit more fuel to start (choke= less air, more fuel) and it sounds like you have this.
But when the engine is hot, it doesn't need this extra fuel to start...so is it getting this extra fuel anyway?
What does your plug say?
I'm guessing you're running rich, and a carb adjustment is all you need.

2strokesteve89 · Apr 29, 2017

If it's red, the valves are shot. Little known fact, the word Honda in Japanese translated means, needs a valve job.

2Wheels · Apr 29, 2017

I just had a head job.
no, I mean I just had a head job. :smirk:

and my valves are fine

timoyz · Apr 29, 2017

2strokesteve89:
If it's red, the valves are shot. Little known fact, the word Honda in Japanese translated means, needs a valve job.

The man from the North speaks wisdom.

2strokesteve89 · Apr 29, 2017

2Wheels:
I just had a head job.
no, I mean I just had a head job.
and my valves are fine

You do it or someone else? Is the clearance good?

timoyz · Apr 29, 2017

His are, doubtful about the OP"s.

snowflake · Apr 29, 2017

sounds like someones going to be replacing some valve shims.

2strokesteve89 · Apr 29, 2017

timoyz:
His are, doubtful about the OP"s.

Oh yeah, wrong guy.

Mihylo33 · Apr 29, 2017

Here's what I know.....
if it won't start cold it's a valve issue.
If it won't start warm it's a carb issue.
I also know that if the exhaust valve is out of spec it will not start warm either.
It's at this point where you might consider getting an owners manual, some feeler gauges and a shim kit, but don't let that stop you from trying everything else like tightening seat bolts and cleaning the air filter.

2strokesteve89 · Apr 29, 2017

Mihylo33:
Here's what I know.....
if it won't start cold it's a valve issue.
If it won't start warm it's a carb issue.
I also know that if the exhaust valve is out of spec it will not start warm either.
It's at this point where you might consider getting an owners manual, some feeler gauges and a shim kit, but don't let that stop you from trying everything else like tightening seat bolts and cleaning the air filter.

I'd say the next step is throwing on a sic set of graphics.

Motomatthew33 · Apr 29, 2017

Alright so i ran some sea foam through the other day and it does start now when its warm, but it doesnt really want to idle when i turn the choke off