Notices
Glow Engines Discuss RC glow engines

o s 91 4-stroke

Old 06-18-2013, 09:15 AM
  #1  
dwreel
Member
Thread Starter
 
dwreel's Avatar
 
Join Date: Dec 2003
Location: southern pines, NC
Posts: 71
Likes: 0
Received 0 Likes on 0 Posts
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
  #2  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,816
Likes: 0
Received 3 Likes on 3 Posts
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
  #3  
flybyjohn
Senior Member
My Feedback: (2)
 
Join Date: Jan 2004
Location: Helena, MT
Posts: 636
Likes: 0
Received 0 Likes on 0 Posts
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
  #4  
dwreel
Member
Thread Starter
 
dwreel's Avatar
 
Join Date: Dec 2003
Location: southern pines, NC
Posts: 71
Likes: 0
Received 0 Likes on 0 Posts
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
  #5  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,816
Likes: 0
Received 3 Likes on 3 Posts
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
  #6  
dwreel
Member
Thread Starter
 
dwreel's Avatar
 
Join Date: Dec 2003
Location: southern pines, NC
Posts: 71
Likes: 0
Received 0 Likes on 0 Posts
Default RE: o s 91 4-stroke

yes, glow plug does light up.
Old 06-19-2013, 05:36 PM
  #7  
nellsey
Member
 
Join Date: Sep 2006
Location: Reading, UNITED KINGDOM
Posts: 47
Likes: 0
Received 0 Likes on 0 Posts
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
  #8  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,816
Likes: 0
Received 3 Likes on 3 Posts
Default RE: o s 91 4-stroke

Hi!
Do you have an electric starter?
Old 06-20-2013, 11:28 AM
  #9  
dwreel
Member
Thread Starter
 
dwreel's Avatar
 
Join Date: Dec 2003
Location: southern pines, NC
Posts: 71
Likes: 0
Received 0 Likes on 0 Posts
Default RE: o s 91 4-stroke

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

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.