Purchased 90 marathon 2 stroke with ?s

stewmagoo · 05-23-2015, 11:17 AM

Quote:

Originally Posted by cart around

The 3pg had 2 different fuel pumps. One was direct mount, and the other was remote mount.

this one is mounted to back of motor towards rear of cart. It is the round one. Looks to be an easy fix.

sccowboy · 05-23-2015, 06:07 PM

Page H-15 of this manual is for fuel pump removal:

stewmagoo · 05-23-2015, 08:31 PM

Thank you for the manual.

stewmagoo · 05-27-2015, 08:31 AM

Ok here's an update. Fixed a small hole in muffler, installed a new fuel pump yesterday. Rode it a few miles and parked it overnight to look for leaks. No keaks , great! Now after riding an extended period of time and then going down to an idle I occasionally develop a backfire. I assume I am getting air from somewhere. Any suggestions? My throttle is set about the same when I give it acceleration at 1/4 pedal to full throttle. Is a linkage adjustment in order?

sccowboy · 05-27-2015, 11:58 AM

Yes, you need to make sure that the throttle plate is closing completely before the pedal switch cuts off. A backfire can blow out your crank seals so double check that asap

stewmagoo · 05-27-2015, 04:56 PM

I have adjusted the linkage and now it closes completely. I lubed all connecting points and moving parts details to follow.

sccowboy · 05-27-2015, 09:56 PM

Cool Deal

stewmagoo · 05-28-2015, 05:33 AM

Quote:

Originally Posted by sccowboy

Cool Deal

The only fault I can find is that after riding full throttle for a fixed period of time, the throttle will stick in the open position for length of time or if you press the brake it will release. Is this a return spring of sort?

sccowboy · 05-29-2015, 11:07 PM

Double check in that manual but it sounds like something is binding up

05-27-2015, 11:58 AM	#35
sccowboy It ain't gonna be easy. Join Date: Apr 2008 Location: St. George, SC Posts: 1,480	Re: Purchased 90 marathon 2 stroke with ?s Yes, you need to make sure that the throttle plate is closing completely before the pedal switch cuts off. A backfire can blow out your crank seals so double check that asap

05-27-2015, 09:56 PM	#37
sccowboy It ain't gonna be easy. Join Date: Apr 2008 Location: St. George, SC Posts: 1,480	Re: Purchased 90 marathon 2 stroke with ?s Cool Deal

05-29-2015, 11:07 PM	#39
sccowboy It ain't gonna be easy. Join Date: Apr 2008 Location: St. George, SC Posts: 1,480	Re: Purchased 90 marathon 2 stroke with ?s Double check in that manual but it sounds like something is binding up

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05-23-2015, 08:31 PM	#33
stewmagoo Gone Wild Join Date: Oct 2009 Location: West Virginia Posts: 291	Thank you for the manual.

05-27-2015, 08:31 AM	#34
stewmagoo Gone Wild Join Date: Oct 2009 Location: West Virginia Posts: 291	Ok here's an update. Fixed a small hole in muffler, installed a new fuel pump yesterday. Rode it a few miles and parked it overnight to look for leaks. No keaks , great! Now after riding an extended period of time and then going down to an idle I occasionally develop a backfire. I assume I am getting air from somewhere. Any suggestions? My throttle is set about the same when I give it acceleration at 1/4 pedal to full throttle. Is a linkage adjustment in order?

05-27-2015, 04:56 PM	#36
stewmagoo Gone Wild Join Date: Oct 2009 Location: West Virginia Posts: 291	I have adjusted the linkage and now it closes completely. I lubed all connecting points and moving parts details to follow.