Cox pull start engines

jsesere Tue Dec 22, 2015 3:46 pm

I'm working on a pull start out of a Dune Buggy and I cleaned the engine thoroughly. Now when I pull the cord it seems to slip and not engage fully. I squirted a bit of fuel into the mechanism and exhaust port and after a couple of pulls it finally engaged. The engine sat for a day and now it's slipping again. Does the engines need a drop or 2 of running, need repair or is the normal?
Joe

balogh Tue Dec 22, 2015 4:50 pm

I think the ratchet does not engage when pulled because of the gummed castor that was pnly temporarily softened by the fuel.

I guess it needs a thorough cleaning. Like dipping into denatured alcohol.

jsesere Tue Dec 22, 2015 6:07 pm

The engine is as clean as I can get it. Anybody else have any info for me?

happydad Tue Dec 22, 2015 6:49 pm

jsesere wrote:The engine is as clean as I can get it. Anybody else have any info for me?

Joe: i squirt the pull start mechanism with contact cleaner, shake it while it has the liquid in it, then spray again to remove the gummy yuck. If that doesn't work, disassemble the stupid thing carefully, not loosing any of the little springs or cams. Soak in fuel or use the contact cleaner, using gloves, and wipe each piece clean. Reassemble with a light coat of light oil or after run engine oil. Worked for me twice.

Happydad RC Plane

jsesere Tue Dec 22, 2015 6:57 pm

The engine has been cleaned thoroughly and I didn't touch the cam or anything else so I'll try some oil. Did yours slip when clean also?

happydad Tue Dec 22, 2015 7:08 pm

jsesere wrote:The engine has been cleaned thoroughly and I didn't touch the cam or anything else so I'll try some oil. Did yours slip when clean also?

You already cleaned the engine. Now clean the pull start.

Happydad RC Plane

jsesere Tue Dec 22, 2015 7:15 pm

It is completely cleaned inside and out. All parts are there it just slips when the fuel evaporates that I use for prime and to lube the pull start.

cox24711 Tue Dec 22, 2015 8:01 pm

it need to bee! lol!

heated on the stove in a pot of olive oil and then put in rubbing alcohol for 2-3 days then put it back together I hope it works

jsesere Tue Dec 22, 2015 8:14 pm

All that has been done using my patent pending method.

dckrsn Tue Dec 22, 2015 8:44 pm

Just thought I'd throw one your way Joe.
I have one of the same engines(here somewhere).
It has the tapered crank nose if I remember correctly.
Any chance the pull starter is slipping on the crankshaft?
I feel your pain.
Bob

jsesere Tue Dec 22, 2015 9:00 pm

Gosh I hope not. Going to try to find my after run oil and give it a try before I panic. :-)

happydad Wed Dec 23, 2015 12:31 am

jsesere wrote:It is completely cleaned inside and out. All parts are there it just slips when the fuel evaporates that I use for prime and to lube the pull start.

I was leaving for the Gym and didn't read the post completely. What type of pull start do you have? The type with the cams or the springs and "clips?, can't think of their name. I tend to lean to Bob's idea that the tapered nose on the crankshaft is not tight to the pull start mechanism. I saw this in one of the "finger starter" type car engines I have and don't have a solution. If the finger starter mechanism is tight the engine will not turn over, if the mechanism is too loose then it slips.

happydad RC Plane

**Admin** Wed Dec 23, 2015 12:41 am

Does this engine have a red pull start handle or a black handle?

jsesere Wed Dec 23, 2015 12:46 am

Yes it's just a basic Dune Buggy engine with a black pull start.

Jason_WI Wed Dec 23, 2015 1:10 am

I have had these pull starts completely apart. Kinda like working on a live mousetrap. There must be gunk in the dog mechanism. Not sure if you have the kind with the two small disks or the cam version. Either way it will need to come apart. This was a constant problem with the GTP Nisan as well.

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Sorry Joe I was in a hurry

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