Mcculloch 4hp no start

[john8504]

#74110

I found a set on eBay new for a Scott Atwater for next to nothing. I think I’m going to try that and order the cap

[john8504]

#74111

http://johnsoldmercurysite.com/whitepapers/mercotronic/files/assets/downloads/page0157.pdf

I found this site that gives the ranges for each condenser. I couldn’t find the 7270 but the 7157 was the same range and looks the same

[Mumbles]

#74126

Lower right.

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[john8504]

#74157

Gotcha

[Michael]

#74258

What color is your spark? If blue , good. If yellow, bad condenser

[john8504]

#74413

So I acquired a Ted Williams that had bred sitting for 2 decades…same motor…and I stole the points and condensor off of it. Points were really clean and condensor seems better. I had no visible spark before and now I have very bright visible spark. I still can’t get it to pop off. I have new points and condensor coming from laings here in a few days. I’m going to try those and cross my fingers.

[joesnuffy]

#74423

Someone mentioned it before about the exhaust possibly being restricted. When I was young I was given a moped 2 stroke. I worked and worked on it but it would not start. I had the exhaust pipe off of it and for some reason tried to start it and it started. Turned out the entire exhaust muffler was full of carbon. I hacked sawed it in to two pieces and removed all the carbon then had it brazed back together and it was fixed. Same thing happened to my lawn boy it would not start and the exhaust muffler which is under motor and mowing deck was full of carbon and it to would not start. Neither motor would as you say pop off and both had spark and fuel.

Since your waiting on points you might consider checking to make sure your exhaust is clear.

Hope that helps,
Joe

[john8504]

#74429

Ok I’ll check it out

[john8504]

#74437

do you have to pull the lower unit off to do this?

[john8504]

#74440

Exhaust had a little bit of build up but no restriction

[john8504]

#74506

I get the new condensor and points in. The points contact area are much larger than original which I guess is a good thing.

My question is why was I sent a capsule with what looks like grease and a piece of polishing paper?

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[Buccaneer]

#74541

The grease would be to put a little bit on the points cam.
Not sure about the paper……. maybe to polish the points?

Prepare to be boarded!

[john8504]

#74553

I figured it out once I posted that and then found out the new spark plug I bought is crap compared to the 30 yr plug that came with it. Going to clean up threads and install here shortly and let er rip.

[john8504]

#74554

I have searched around. Do y’all know what the correct plug is?

[john8504]

#74559

Bright blue spark, trying priming with anything under the sun that burns and still nothing. It’s spitting out a lot of black from exhaust since I have the lower unit pulled off.

About to throw this thing across the yard.