Did I kill it?

[carterjoe]

Okay, so I'm completely lost. I cleaned up the head with 220 grit sandpaper and put in a new gasket. Fired right up with no squeal. However, I think it is still running too hot. I'm not familiar with how they normally run, but within 5 minutes of running at fast idle, the front grill housing and engine block are too hot to touch. Also, it runs rough, and seems to be missing/hunting when I run it up to speed. Here's the full history of the engine:

Rebuilt 6 months ago (new crank, rod, piston, rings, .20 over, valves lapped in)
New points, and Kirk Point Saver system with Bosch coil
Rebuilt carb (main needle, gaskets, throttle shaft, float needle and bushing)
Plug is 6 months old

Here's what I have checked so far

Remover tins and cleaned cooling fins
New head gasket
Checked valve clearances (.09 intake and .18 exhaust)
Timing (easy with the Point saver, Light comes on exactly at the S mark)
Plug gap (.035)
Took carb apart this morning and cleaned it all out (there was some sediment in the bowl), also cleaned out fuel sediment filter on tank (had some sediment in it)
Set carb for factory settings (2 1/4 on main and 1 3/4 on low speed)

Any ideas on what it could be? I'm about ready to sell the thing. I've put a ton of money into it and there always seems to be something new.

[carterjoe]

Here a link to a video of it running
http://s1266.photobucket.com/user/cs..._0171.mp4.html

[Sam Mac]

Sounds like it may be a bit lean. How are the bushings on the throttle shaft?

[Dane in PA]

Will too much back-pressure do that? The exhaust pipe looks pinched off at the end, and the reduced flow might be creating a little too much... I'm no expert, but thought I'd throw in my $0.02.

[J-Mech]

Originally Posted by carterjoe

Okay, so I'm completely lost. I cleaned up the head with 220 grit sandpaper and put in a new gasket. Fired right up with no squeal. However, I think it is still running too hot. I'm not familiar with how they normally run, but within 5 minutes of running at fast idle, the front grill housing and engine block are too hot to touch. Also, it runs rough, and seems to be missing/hunting when I run it up to speed. Here's the full history of the engine:

Rebuilt 6 months ago (new crank, rod, piston, rings, .20 over, valves lapped in)
New points, and Kirk Point Saver system with Bosch coil
Rebuilt carb (main needle, gaskets, throttle shaft, float needle and bushing)
Plug is 6 months old

Here's what I have checked so far

Remover tins and cleaned cooling fins
New head gasket
Checked valve clearances (.09 intake and .18 exhaust)
Timing (easy with the Point saver, Light comes on exactly at the S mark)
Plug gap (.035)
Took carb apart this morning and cleaned it all out (there was some sediment in the bowl), also cleaned out fuel sediment filter on tank (had some sediment in it)
Set carb for factory settings (2 1/4 on main and 1 3/4 on low speed)

Any ideas on what it could be? I'm about ready to sell the thing. I've put a ton of money into it and there always seems to be something new.

I have no idea what your going by to say its running hot. After 5 minuets of running the engine SHOULD be too hot to touch. It's a motor, it gets HOT when it runs. As far as the motor not running right, from your pic of the engine with the head off, looks like its running WAY too rich. Both valves were black with soot. Especially the intake. Some of that may have come from when the head gasket blew, but from what I see, it looks pretty thick. You need to adjust the carburetor. I have no idea what a Bosch point saver is... or why you would put a Bosch coil on it. I have worked on thousands of motors, and it's been my experience on a regular stock motor of ANY kind, that when you screw around with "hopping up" the ignition, you only create problems. I suggest a Kohler coil, points and condensor.

[Billy-O]

I'm not sure if anyone mentioned this, but make sure the cooling fins are free of grass and cruds... especially by the exhaust valve. Should have a good flow of air coming from the flywheel.