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o s 91 4-stroke

Old 06-18-2013, 09:15 AM
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Default o s 91 4-stroke

I can't get the engine to start, not even "pop". It's broken-in and about 3 12oz tanks of fuel run thru it. Last time I changed props the thrust washer came off with the prop. The woodruff key also came off and I didn't notice it. After several attempts to start the engineI I realized the key was missing. Sent off for a new key and installed it. Now it won't start. I think I'm missing something here. Could there be a timing issue ? This is my first 4 stroke so I'm somewhat in the dark with trouble shooting.
Sure would appreciate any help sent my way.
The starting battery is good and I installed a new "F" glow plug. Fuel runs fine in my .46 ST.
dick.
Old 06-18-2013, 10:01 AM
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Default RE: o s 91 4-stroke

Hi!
Have you checked that ¨the glow plug really works?
It should glow with a white orange shine!

Does fuel reach the carb??

What fuel do you use ?? At least 5% nitro is required!

13x8, 14x6 or 15x4 Prop should be used!
Old 06-18-2013, 11:12 AM
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Default RE: o s 91 4-stroke

Mine likes to start fairly wet (with a good prime). If it ran prior to loosing the woodruff key and it isn't now and nothing was done to it inbetween then it sounds like glow plug or fuel.

I prime mine good and then with the glow plug ignitor connected, I turn over the prop (with a good hold on it so it doesn't pop on me) by hand until I get it to bump on the comp. stroke, then back it one turn and flip it backwards and it usually fires up. Sometimes it takes a bit of turning by hand to get it to bump.
Old 06-18-2013, 03:19 PM
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Default RE: o s 91 4-stroke

glow plug is good, fuel is 10%, fuel comes out of muffler. I have been thinking about removing the valve cover and check there, but hesitate.

dick.
Old 06-19-2013, 09:43 AM
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Default RE: o s 91 4-stroke

Hi!
If you haven't tampered with the cam timing before why think it has changed suddenly? -It cannot! The tappet gap is easy to check!
It should be between 0,04 -0,1mm or more precisely, a 0,04mm steel shim should pass under but a 0,1mm should not.
Are you sure the plug works? Have you checked that it glows? If the engine gets fuel,air and glow...it cannot say no to work!
Old 06-19-2013, 09:56 AM
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Default RE: o s 91 4-stroke

yes, glow plug does light up.
Old 06-19-2013, 05:36 PM
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Default RE: o s 91 4-stroke

Try another plug and glow ignighter first.
Is there much compression?
Old 06-20-2013, 08:51 AM
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Default RE: o s 91 4-stroke

Hi!
Do you have an electric starter?
Old 06-20-2013, 11:28 AM
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Default RE: o s 91 4-stroke

Yes, I do have an electric starter and use it all the time.

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