Would bad crank seals affect reeds?

[droptrd]

I recently picked an 86 G1. didn't run. Has oil caked over carb and bottom of engine. really bad behind clutch. I have crank seals ordered. The cart will run but I have to shoot carb cleaner and/or ether in the intake to get it going then hook the air cleaner back to it. it will run for a short while, but sputters and bogs. after shutting off for a few minutes, it won't start again. removing the air intake show fuel in the tube. Would this be because of the bad seals? Or do I need to order new reed valves? the compression is 80-90psi.

[Lochlin]

80 - 90 psi is too low for these carts. You should be at 120 psi or so give or take a bit. You have a top end rebuild in your future. Personally, I would get that done first then see where you are at with the other stuff.

Yes, bad seals can affect reed performance in that the 2 cycle vacuum system is all connected. At 80-90 psi it probably doesn't matter. That cart isn't going to run well (or at all) if that compression isn't higher.

[droptrd]

I was afraid of that

[cgtech]

Know what originally caused that 90 psi compression? Those bad seals... And washing out the oil/running on carb cleaner & ether (which has no oil) sure doesn't help either.

[droptrd]

Originally Posted by cgtech

Know what originally caused that 90 psi compression? Those bad seals... And washing out the oil/running on carb cleaner & ether (which has no oil) sure doesn't help either.

one shot of carb cleaner won't hurt it.

[Lochlin]

For what it's worth, the starter fluid I use has lubrication added to it and has "safe for use in 2 cycle engines" printed right on the can.

Hey GCtech (or anyone for that matter), can you expound on how bad seals affect compression? By no means am I implying that you are incorrect in any way. I have heard the "bad seals = bad compression" thing a few times from a few different people now and I have really never gotten it. I always assumed that compression is piston up and vacuum is piston down and that, assuming the cylinder / rings were good the two really don't impact each other much. When I do a top end and check compression (assuming everything went together right) compression holds steady long after the engine stops. Why would seals impact that? If anything, one could surmise that poor vacuum in the case would help cylinder compression in that there is no vacuum down below trying to suck compression being held up top.

Again, I promse that I am not disagreeing. I am just trying to understand things a bit more.

[Lochlin]

Originally Posted by Lochlin

For what it's worth, the starter fluid I use has lubrication added to it and has "safe for use in 2 cycle engines" printed right on the can.

Hey GCtech (or anyone for that matter), can you expound on how bad seals affect compression? By no means am I implying that you are incorrect in any way. I have heard the "bad seals = bad compression" thing a few times from a few different people now and I have really never gotten it. I always assumed that compression is piston up and vaccuum is piston down and that, assuming the cylinder / rings were good the two really don't impact each other much. When I do a top end and check compression (assuming everything went together right) compression holds steady long after the engine stops. Why would seals impact that? If anything, one could surmise that poor vacuum in the case would help cylinder compression in that there is no vacuum down below trying to suck compression being held up top.

Again, I promse that I am not disagreeing. I am just trying to understand things a bit more.

Working the Google may have gotten my answer to this: Bad seals do not directly affect compression. They may indirectly affect it as, over the course of time, the lean condition caused by poor seals can cause premature wear and tear on the top end.

Sounds reasonable enough to me. All hail The Google.

[droptrd]

Originally Posted by Lochlin

Working the Google may have gotten my answer to this: Bad seals do not directly affect compression. They may indirectly affect it as, over the course of time, the lean condition caused by poor seals can cause premature wear and tear on the top end.

Sounds reasonable enough to me. All hail The Google.

Makes sense

[cgtech]

Rinnung a 2 stroke with leaky seals lets in air, air that did not pass through the carb to get fuel mixed in it. When unmetered air is allowed in, it creates a lean air/fuel ratio. A lean air/fuel ratio will burn up a 2 cycle engine in very short time. So, when the seal first starts leaking it won't lower compression, but the effects of a lean air/fuel ratio will cause low compression quickly. Ahh, I see Google beat me to it..

[droptrd]

so is this the reason there is fuel in the air cleaner tube, or do I need to replace the reeds?