Modified Gx200

[Abtheman28]

Your gonna need some Prussian blue to check your lap job properly. Be EXTREAMLY sparring with it. A tube will last a full blown rebuild shop for 50 years! Not joking.

https://www.permatex.com/products/s...epair/rebuilders-aids/permatex-prussian-blue/

Yup I have coarse and fine grinding paste for lapping in the valves and have just finished the job. Both seat nicely in the head as we speak. I took my time with it and gave them a nice finish.

---------- Post added at 12:36 PM ---------- Previous post was at 12:33 PM ----------

That's not your problem.
It's still something else.

Oh, and where's your breather tube?

Breather tube was out at the time of photo. I just have a pod style filter element on the end of it and have done for the last 2yrs.

Yeah even I'm not sure what it is really, just looking for possibilities and trying as I go. Process of elimination

 

[Melloreel]

Ok. It's like watching a soap opera and Carlos is about to be killed, and they go to commercials. Did you fix this? What was the cause?

 

[bob58o]

How I check for leaky valves.
https://www.youtube.com/watch?v=P6KyX1s6_UI

 

[Bbqjoe]

How I check for leaky valves.
https://www.youtube.com/watch?v=P6KyX1s6_UI

I have no idea what you're doing.

 

[bob58o]

I have no idea what you're doing.

In the video or in life?

I installed the valves then poured soapy water into the chamber. Then i took the air compressor and blew compressed air though the ports while I looked for bubbles. A bad seal will have bubbles. A good seal won't.

https://www.youtube.com/watch?v=DkH4cNAahZQ

 

[Bbqjoe]

I like clarification. Thank you.

 

[ond]

I know you say it has good spark, but maybe not when it warms up ? If its a Honda/clone engine I would screw the resistor out of the plastic spark plug boot and clean and reinstall it. It takes a flat head screwdriver. Could also be the coil itself overheating. I've also had the clone engines do this when the plug was to cold of a heat range.