Jump to content
jim1980cj5

Problems when i throttle up

Recommended Posts

jim1980cj5

I have a late 70s c165 wheel horse  it idles fine but when i throttle it up runs like crap

Share this post


Link to post
Share on other sites
 
gwest_ca

Single cylinder Kohler or B&S twin cylinder?

 

Garry

Share this post


Link to post
Share on other sites
 
KC9KAS

@jim1980cj5 :text-welcomeconfetti: to :rs:

Share this post


Link to post
Share on other sites
 
953 nut

:WRS:  Could be caused by a few things. It could be as simple as a plugged fuel filter or loose carb. mounting bolts or bad spark plugs. Have you cleaned and rebuilt the carburetor? Some gains can be made on dirty fuel systems by adding some "SeaFoam Gas Treatment and spraying SeaFoam Carburetor Cleaner into the air inlet while the engine is running at mid throttle. Another consideration might be to readjust the high speed needle on the carb. Let us know what you have tried and what the results were.

Share this post


Link to post
Share on other sites
 
jim1980cj5

Single cylinder kohler 

Did with both new and old carb

New points condenser and coil

Share this post


Link to post
Share on other sites
 
953 nut

If you have a good strong spark and know that you have good fuel flow to the carb. then you may want to remove the head and remove any carbon accumulation and make sure there isn't some carbon preventing the valves from closing completely.

 

Hope this helps.

Share this post


Link to post
Share on other sites
 
Ed Kennell
11 hours ago, 953 nut said:

If you have a good strong spark and know that you have good fuel flow to the carb. then you may want to remove the head and remove any carbon accumulation and make sure there isn't some carbon preventing the valves from closing completely.

 

Hope this helps.

Dick is right on.    Make sure you have good spark at the plug.     I know you tried a new carb, but are you sure you have a good fuel supply to the carb?  Pull the line off at the carb and see if you have a strong supply when you crank the engine.  Make sure you pump into a container.        If it runs better when you squirt fuel directly into the carb, it indicates you still have a fuel delivery problem.  Possibilities are clogged tank cap vent hole, clogged screen in tank, dirty fuel filter, soft restricted fuel lines, bad fuel pump, air leaking in at carb mounting flange or around throttle shaft.

I agree with Dick,  You must have good spark and a good fuel supply. If so, then look for a compression problem ie valves not functioning properly. I would Check clearances first then pull the head and check seating.

  • Like 2

Share this post


Link to post
Share on other sites
 
shadyady

I had same problem changed my carb points coil plug turns out to be faulty condenser easily overlooked mine runs spot on now was a swine to find.

  • Like 1

Share this post


Link to post
Share on other sites
 
jim1980cj5

Thanks for the help going to start eliminating the possible problems this weekend

  • Like 1

Share this post


Link to post
Share on other sites
 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...