Td-20 won't run right

B

big_fisher

Cadet
Joined
Jun 17, 2006
Messages
18
I need some help.i got this td-20 johnson from the late 40s but it will only run for ten seconds or less i went through the carbs and cleaned the pionts but it still will only run for 10 secs. i use champion J8c spark plugs and run 24:1 oil,gas and i have a tn-28 to will the parts be compatible with the td-20 i am very very new at this so please keep it simple
 
SpinnerBait_Nut

SpinnerBait_Nut

Honorary Moderator Emeritus
Joined
Aug 25, 2002
Messages
17,651
Re: Td-20 won't run right

Welcome to iboats Fishing_boy.<br />Let's get this to the Johnson/Evinrude forum for answers.
 
P

Paul Moir

Admiral
Joined
Nov 5, 2002
Messages
6,847
Re: Td-20 won't run right

10 seconds sounds like a fuel delivery problem. How's the flow from the tank? What kind of shape was the float in? <br />TN-28 is like a TD except it has the shifting lower unit I believe.
 
B

big_fisher

Cadet
Joined
Jun 17, 2006
Messages
18
Re: Td-20 won't run right

the fuel flow is good i cleaned it out and so is the float but is gas suppose to come out the top of the carb
 
P

Paul Moir

Admiral
Joined
Nov 5, 2002
Messages
6,847
Re: Td-20 won't run right

No. Either the float is sinking or the float valve is leaking.
 
P

Paul Moir

Admiral
Joined
Nov 5, 2002
Messages
6,847
Re: Td-20 won't run right

Pull the float, toss it in some gas and see if it's nice and buoyant. If it isn't, there's a Merc float you can hack into shape rather easily. If it's the valve leaking, I would probably try something like lapping compound to refit it. Tricky business there though.
 
P

Paul Moir

Admiral
Joined
Nov 5, 2002
Messages
6,847
Re: Td-20 won't run right

If the float is floating sufficiently to close the float valve, then the float valve itself must be leaking. It's a very simple system much like a toilet tank float, where the cavity the float fits in is the toilet tank. You've got an overflowing toilet tank right?<br /><br />I would go after the float valve and it's seat then. You should be able to blow in through the fuel line and stop it by lifting the float valve.<br /><br />Send me an email at paul.moir@gmail.com I've got some additional info on that carb that might be helpful to you.
 
P

Paul Moir

Admiral
Joined
Nov 5, 2002
Messages
6,847
Re: Td-20 won't run right

Well, if the carb is overflowing it's got to be one or the other. My guess is the float isn't buoyant enough. Do you have a cork around you can carve into a similar shape?
 
B

big_fisher

Cadet
Joined
Jun 17, 2006
Messages
18
Re: Td-20 won't run right

hay thanx it worked now my motor even runs nicely. This has been a fun time and thanx again
 
You must log in or register to reply here.
Top