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Unread 05-04-2013, 05:26 PM   #11
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Default Re: 88 Marathon timing tips

Ok. I wasnt lent down a path yet on this Marathon. On a new comp tester I have 120 psi. woo-hoo. Ideas. Could air gap do this. As I have said I put a light on it and see those marks are very forgiving. Timing doesnt move a whole heck of a lot if your not quite on. Ideas? I may pull the carb to check on the gassy exhaust. Maybe pull apart the fuel pump to be sure. On the flip side, will polarity of the wires on the pulsar effect forward reverse speed.? As for a governor. Its missing. Frankly I dont see how they work as I have yet to find a diagram of this one. I just have a knurled stub on a lever with a cable to the throttle arm. It stops it at a full position or there abouts.
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Unread 05-04-2013, 05:43 PM   #12
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Default Re: 88 Marathon timing tips

Oh. It sounds notably faster in reverse. I have some clutch bushing wear that I suppose could be a problem but the engine is peppier in reverse than forward.
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Unread 05-04-2013, 07:34 PM   #13
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Default Re: 88 Marathon timing tips

Ive put the marks back to center. When it started it ran great, then loaded up and slowed so I checked the fuel pump ok and the Carb. It has so much weare on the butterfly at the shaft its amaging. The float as well looks a little dicey in that the tang is on an angle to set it level to the bowl gasket. I need parts I think.
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Unread 05-04-2013, 08:29 PM   #14
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Default Re: 88 Marathon timing tips

Yep sounds like it. With a worn throttle shaft you have a major air leak. It sounds like a new carb is in the future as parts will cost about 2/3 what a new one would and you still have a worn throttle shaft. Are you sure the choke is not closing on you? Governor no problem most of us remove them. Yes polarity does make a difference on the pulser blue wire to A terminal an red to B from the igniter.

LOU
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Unread 05-04-2013, 09:42 PM   #15
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Default Re: 88 Marathon timing tips

And not to second Lou's opinion yet AGAIN, but I second that - although I will throw in that there really isn't (at least in MY experience) a difference in polarity really, one way it works one way it doesn't (literally, 2 black wires and a unidirectional plug that says "Reverse and Neccessary" wouldn't have been entirely out of order in this case)
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Unread 05-05-2013, 12:40 PM   #16
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Default Re: 88 Marathon timing tips

Brew & Buggy these were per instructions from ezgo {issue date 1985} and the recommended wire connection at the pulser with stock ignition. Agreed with hei conversion at times they will be reversed. Just saying


LOU
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Unread 05-24-2013, 07:18 PM   #17
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Default Re: 88 Marathon timing tips

Got my carb, finally. It had no low speed. I opened it up to find the carb is slightly different from the original Mikuni. This one too says Mikuni but I have my doubts that its a cheap copy. The atomizer well was only in by 2 threads blocking the passage for the idle circuit. Some looking found the depth of the hole shorter. Bad copy. I had to index the position it stops at and cut a releif slot for the start of the passage but it hasnt helped much. Any ideas. The old carb had too much wear on shafts and pivot holes but did idle on this engine. This one I have to choke it every time to start. I reset the starter switch to idle it down but its starves and dies of fuel. Choke restart to get going otherwise it cranks and cranks. . . . Im going to look at the idle further but ideas anyone.
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Unread 05-24-2013, 07:24 PM   #18
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Default Re: 88 Marathon timing tips

Oh. It revs good both ways now!
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Unread 05-25-2013, 09:17 PM   #19
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Default Re: 88 Marathon timing tips

I have to take back the runs OK both directions. Only did that for a moment until it cleared. I re-cleaned the new carb and had something quite solid blow out of the idle passage. It runs and idles on it but I still had the same problem of it being a dog in forward and peppy in reverse.

Well boys! I have found the problem. I had done a compression test with 120 psi but hadn't thought about doing it both ways. So I did and with the reed block out as well. Now this is the interesting part. In forward it will get to 120 but hesitates a bit around 90 psi. In reverse it goes right up smoothly. If you rotate the flywheel by hand you get a bounce turning reverse and leaking going forwards. I pulled the engine and found **** near a quarter of an inch of end gap on the top ring.

Its just order parts and this belated Mothers Day present will have to wait a little longer to drive a little old lady (Mon) around the property.

heres a couple of pics.
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Unread 06-21-2013, 07:53 PM   #20
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Default Re: 88 Marathon timing tips

I have some other issues yet to deal with but I'd like to ask. Where on Gods green earth did some knob come up with a gas ratio of over 100:1

Try this link
http://www.ultralightnews.ca/fujirobinmanual/

Yah its a plane.
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