New Cylinder Head, Now it won't start.

[music man]

Originally Posted by patrick_777

Also, just because it ignites at the plug hole doesn't mean there's sufficient fuel in the cylinder during the ignition phase. The residual vapor in the cylinder will always ignite. There are much better ways to check gas flow to the cylinder than this.

Have you checked all of your vacuum lines?

(Yea what he said) Very good explanation there Patrick.

[davidsuserid]

I have checked the vacuum lines that I know relate to fuel. When it does ignite, it is only a little poof, so maybe it is that it isn't getting enough fuel. I am going to take it apart again this afternoon and take another look at it.

[patrick_777]

I haven't followed your ongoing efforts so maybe I'm rehashing old things. Have you made sure the fuel petcock "filter" isn't clogged in the tank? Are you certain the carb is getting gas? Have you sprayed/poured gas into the carb, then fired it?

[davidsuserid]

As far as i can tell it is getting gas. I drained the float bowl and a lot came out, and every time i take the tank off, gas drains out of the supply line after i disconnect it. I did take a look in the head from the intake side, and it didn't look wet at all, but I don't know if it is supposed to.

[GZ250]

may be there is not enough gas in the gas tank, try the lighter there......... hahahahahaha

[patrick_777]

:haha: :haha: :haha:

Nice one.

[alanmcorcoran]

C'mon guys, you know David is a bit sensitive, plus, he spent a lot of time effing with his bike and now it won't run, and yet... you can't help yourselves.

I worry that one day 98.9% of all posts will be from Easy, Patrick and me. And mine are completely worthless.

[davidsuserid]

It doesn't bother me, obviously if it was such a bad idea, something bad would have happened by now. I know enough about engines to know the amount of fuel inside the cylinder isn't enough to do a whole lot of damage, especially if the piston is on the down side of the stroke leaving a lot of room for combustion in the chamber and there is a hole for the gas to escape once it is lit. It doesn't bother me because it isn't an issue.

Anyway, back to the point of the post. I have checked all the places that gas goes, and none of them are clogged, it would seem the carb is getting gas fine, but whether it is passing it on or not, I don't know, and I am not about to go taking that thing apart. I am probably gonna take the whole bike up to a shop this weekend and have them look at, I know it is something simple I am just overlooking. Oh, and I'll be sure to warn them not to light the gas tank with a lighter, thanks for that heads up.

[alanmcorcoran]

David,

I was going to recommend it was time to hit the bike shop, but I figured you were trying to save money and, maybe, face. When I've taken on challenging fixes that involve tricky disassembly and re-assembly, there's always an element of man against machine and I hate to surrender prematurely. I take it personally when the machine wins.

[mr. softie]

Just my .0002% worth, but knowing that gasoline vapors ignite explosively, why are you even near the bike with a flame?