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!

wheel horse toubles


ALMOST's Avatar
Visiting Guest

Posts: n/a

06-10-06, 07:13 PM   #1  
ALMOST
wheel horse toubles

11 hp b&s runs great cold , has just a little liimp , but when it warms up it starts back fireing and poping , pulled head and checked valves , seems ok , head gasket and head and block look ok , carb seems to be fine , only thing havent checked is points and coil , and fly wheel key , this is a old riding wheel horse , have no information manual on this thing , thanks in advance

 
Sponsored Links
marbobj's Avatar
Member

Join Date: May 2006
Posts: 3,658
IA

06-10-06, 08:01 PM   #2  
Bob

The other parts you're working towards could cause that. When you checked the valves did you check the rise and fall of them with the head off? A compression check would help you eliminate possiblities.

If you replace the coil take note of whether you need an external resistor or internal resistor type. The latter would have the resistor built in. To cross the two applications would burn out your new coil quickly. Take in your old one and double check what you get.

Hope this helps

 
ALMOST's Avatar
Visiting Guest

Posts: n/a

06-10-06, 08:06 PM   #3  
ALMOST
marbob

this mower runs strong when cold , when heated it starts poping and back fireing , yes did turn crank and watched valves open and close , but did'nt do a compession check , why would it run good cold and not when it is warm

 
marbobj's Avatar
Member

Join Date: May 2006
Posts: 3,658
IA

06-10-06, 08:21 PM   #4  
Bob

When a coil is failing it typically acts up when it gets hot. They have oil in them to hold the internal temperature down, but when they go bad the windings short out and the resulting heat is more than the oil can dissipate.

It's similar to a battery that works when it's cool, you drive the car a while, shut it off and the battery is dead. The plates in the battery have expanded and contacted a shorting agent.

In the case of the points, if they're burned the contact is poor and heats the more it is used.

In all cases the hotter something gets the more resistance it has to electrical flow and the poorer its performance will be.

Hope this helps

 
ALMOST's Avatar
Visiting Guest

Posts: n/a

06-12-06, 07:16 PM   #5  
ALMOST
marbobj

thanks for the heads up on your post , you nailed it , my son changed out thhe coil and points tonite off a old bs engine someone gave him , and it runs great from what i hear ,

 
Search this Thread