runs good cold runs bad hot?

doozerann

My 93 with 295 motor runs good cold, as it warms up it runs like crap. Any ideals. i have cleaned carb, fuel pump,new tune up kit, adjusted valves (004) , new hoses. What else can it be?

BGW

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reinman88

I'm no mechanic, but I have had a couple situations where running bad when warmed up was because of a bad coil.

doozerann

Would the coil get hot ?

Dave Box

It sure can. For example if your regulator has given up you may be running at 18 volts which will cause the coil to overheat an give an erratic output. Of course it could be a veritable cornucopia of other things but it might be worth putting a voltmeter across the battery and with the engine running see what volts you have.

Dave

doozerann

Dave, I did that got 14.7- 14.9 within range right?

DOOmsman

A bit far out but the neighbors cart was doing a hit
or miss miss and the screw on cap was undone and
making sporadic contact on the plug.

Dave Box

That is perfect, so we need to look elsewhere.

Dave

Dave Box

Does it need to be choked when it is cold? If not then maybe it is running rich. Choke butterfly stuck on? air filter clogged? air passage to carburetor kinked?
What color are the spark plugs?

Dave

doozerann

Dave, new plugs, a little gas on them, yes it does need choke to start cold,new air filter.Now i have bigger problems, air came lose while putting on new valve seals-guides valve fell in so i'm in process of pulling the head,happy days lol. Thanks Dooz

racin161

I'm wondering if someone can shed some light on this.I haven't worked on these but have done the same thing on automotive.When doing this wouldn't it be wise to make sure the piston is at TDC to prevent this from happening if the air comes loose. Valve would only fall and contact the piston instead of dropping in the cyl. What ya think DAVE & GUYS