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05-15-2011 03:30 PM  8 years ago
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T 3d

rrApprentice

Boston Mass

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os sz max
i have a os sz max 91 and for some reason it just will not start and i change the fuel line and check the filter and chang the glow plug .what else am i missing

also i want to know have there been any know bad history with this engine
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05-15-2011 06:00 PM  8 years ago
geink

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nova scotia, Canada

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engine will not start.
I had a couple of engines that would not start. one was an os max, I made a new gasket for the mulffer, I bolted it on to see if it fit right, it did. but the engine would not start, after a couple of days and much **#** I realized I had not cut out the gasket center, I did that and the eng ran great.
the other engine was a old MCkoy, I took the needle valve and body out to clean them and i installed the valve body with the fuel hole up instead of down . I spent months trying to get that thing going, I finely realized what was wrong , fixed it and then it ran fine.

your engine is probley something simple.
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05-15-2011 06:24 PM  8 years ago
airdodger

rrElite Veteran

Johnston USA

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You need fuel, compression and ignition. If the bearing is gone it will have a lot of drag and cause problems. If the engine sat the ring could be stuck. Put fuel into the engine, couple drops in the plug hole and see if it starts.Chris
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05-23-2011 12:03 AM  8 years ago
T 3d

rrApprentice

Boston Mass

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os sz max
well i took the engine apart and found some black carbon build up on top of the piston and i assume if i clean off the carbon it would be fine but my question is why the carbon get there and how to prevent it from building up from again
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05-23-2011 12:28 AM  8 years ago
l4rg0

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Northfield, KY - USA

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What kind of fuel are you running? Carbon is normally from oil not burning wellTeam A Main Hobbies/ProTek R/C
Spartan Avionics Field Rep
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05-23-2011 04:47 AM  8 years ago
airdodger

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Johnston USA

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The oil should not be burning on top of the piston. Probably too lean. If the residue just wipes away you are probably too rich. The bad history may be from you. Chris
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05-23-2011 10:19 AM  8 years ago
T 3d

rrApprentice

Boston Mass

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OS
Well I clean up the piston and change the fuel filter and glow plug and still will not start
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05-23-2011 11:57 AM  8 years ago
airdodger

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Johnston USA

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Did you try putting fuel in the engine like I mentioned? Did you use new fuel and a new plug? Did you check if the ring was stuck? Is the glow driver working? Cleaning the piston is not going to change if the engine starts or not.Chris
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05-23-2011 02:18 PM  8 years ago
T 3d

rrApprentice

Boston Mass

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OS
When I get he from work I will try that put fuel in the glow hole but if it works does that mean I got to do that every time to start it and if the piston was stuck I assume the starter couldn't turn the motor over
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05-23-2011 02:32 PM  8 years ago
airdodger

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Johnston USA

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Putting fuel in the chamber is just to check to see if it is a fuel issue. The engine should turn freely without the plug installed, if not you need to take it apart and find the problem.Chris
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05-23-2011 02:50 PM  8 years ago
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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Kind of basic but you should start there, make sure fuel is running to the engine, throttle curve is OK, muffler unplugged, and glow is working.Team Synergy, Rail blades, Team Scorpion, V-Team
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05-24-2011 03:32 AM  8 years ago
T 3d

rrApprentice

Boston Mass

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Os
The fuel in the glow plug hole didn't work but it's up and running know . Not sure which remedy work but it started up today well thanks boys for the help
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05-24-2011 11:48 AM  8 years ago
airdodger

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Johnston USA

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The fuel may have freed the ring up.Chris
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05-25-2011 03:22 PM  8 years ago
MartyH

rrProfessor

USA

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+1 for fuel in the plug hole. I bet it unstuck the ring.
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