Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

troy bilt 475ss linetrimmer troubles


sulli2's Avatar
Member

Join Date: May 2009
Posts: 36
MA

06-04-09, 05:52 AM   #1  
troy bilt 475ss linetrimmer troubles

I have a line trimmer that starts, although with difficulty,but it stalls or will not go beyond idle when the throttle is pulled.I have eliminated the carb as the problem and the valves are adjusted correctly.The fly wheel key is intact and the muffler and flame trap are clear.Lastly the fuel filter is new.My question is could this be an ignition problem?does anybody know how to test the coil? does it have an ignition advance?Any thoughts would be appreciatedThank You

 
Sponsored Links
BFHFixit's Avatar
Forum Topic Moderator

Join Date: Jun 2007
Posts: 1,764
KS

06-04-09, 06:56 AM   #2  
Sounds like a fuel issue to me which is usually related to the carb. How have you eliminated the carb as the problem?

The coil either works or it doesn't, if you have spark, then the coil is working, since it will run I would say you have spark.

 
sulli2's Avatar
Member

Join Date: May 2009
Posts: 36
MA

06-04-09, 08:32 PM   #3  
troy bilt line trimmer

Thanks for the reply.When I first got this trimmer I thought all it needed was a filter,replaced same no help.then I thought either inlet screen or bad diaphram,rebiult carb and replaced manifold gaskets,no help.still felt it was a fuel problem and on closer inspection found the fuel nozzle in the throttle barrel split,thought for sure this was the problem...so new carb,no help.Also during all this I checked the exhaust for any blockage and adjusted the valves,they were off a little but no help.So at this point I was wondering about the coil.I do have auto and aircraft maint experience but am just learning these small engines any help is appreciated.Thanks again

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,573
GA

06-04-09, 09:36 PM   #4  
What kind of compression does it have?


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
sulli2's Avatar
Member

Join Date: May 2009
Posts: 36
MA

06-05-09, 08:45 AM   #5  
I,m not sure what the compression is, but I did pull the cylinder to look at the valve seats and I could not separate the eng halfs till I removed the spark plug ,so the rings seem to seal good and the ring gap was staggered .the valve seats and the valves were in good shape.Do you know what the compression should be?

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,573
GA

06-05-09, 11:22 PM   #6  
Around 90 psi.

How far are the valves opening and closing? I wonder if a cam lobe is worn down.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
sulli2's Avatar
Member

Join Date: May 2009
Posts: 36
MA

06-08-09, 05:42 AM   #7  
I've got .125 on the intake and .115 on the exhaust.

 
sulli2's Avatar
Member

Join Date: May 2009
Posts: 36
MA

06-08-09, 08:10 AM   #8  
that measure is in inches

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,573
GA

06-08-09, 09:21 PM   #9  
I'll have to look at one at the shop... I think there's one I can look at there. That doesn't seem like enough (1/8 inch and less?)


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
Search this Thread