Ran yesterday...Wont run today
Moderator: Rob Voska
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- Vintage Karting items owned: margay concept
Ran yesterday...Wont run today
I went out to start my cart this evening, It started up then fouled the plug and died. The carb was also flooding. Yesterday I started it, adjusted the idle/low speed needle, let it warm up,and took off down the road. This was the first time in 25-30 years that the engine had been started. It has all new parts in the carb, The arm that controls the needle is adjusted flush w/ the top of the carb body. Oh yeah...Its a Mc 91b1 with a bdc 14 carb. Any thoughts?
Thanks
Eric
Thanks
Eric
- steveohara
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1965 Dart Gran Prix twin Mc100s
1963 Bug Scorpion ESll Mc45
Re: Ran yesterday...Wont run today
First thought..... yep, it's a McCulloch, nothing unusual
Second thought.... you need to provide more info..... what is the popoff pressure? Where are the jets set? Did the duck bill swell up or is it still the same size as when you installed it? Did you pull the plug to see if it is wet? How did you kill the motor when you ran it the first time? If you choked it to shut it off you may have flooded the motor with fuel. Will the carb draw fuel when you crank it over? If it pulls fuel up the line when cranking, does it stay there when you stop or does the fuel run back down the line filling the line with air?
Answers to these questions will help in identifying the problem.
Regards,
Steve O'Hara
Second thought.... you need to provide more info..... what is the popoff pressure? Where are the jets set? Did the duck bill swell up or is it still the same size as when you installed it? Did you pull the plug to see if it is wet? How did you kill the motor when you ran it the first time? If you choked it to shut it off you may have flooded the motor with fuel. Will the carb draw fuel when you crank it over? If it pulls fuel up the line when cranking, does it stay there when you stop or does the fuel run back down the line filling the line with air?
Answers to these questions will help in identifying the problem.
Regards,
Steve O'Hara
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Re: Ran yesterday...Wont run today
pop off pressure---dont know
low side ---just past 3/4 turn
high side---just under 1 turn
duck bill is a new elder rubber duck bill (will it swell that quick?)
Plug was wet
Pulled the plug to kill it
Had to cover the throat of the carb to get fuel up the line and to the carb..once it was there it stayed...no air
It also had fuel sitting in the carb throat...Plug was soaked
thanks
Eric haynie
low side ---just past 3/4 turn
high side---just under 1 turn
duck bill is a new elder rubber duck bill (will it swell that quick?)
Plug was wet
Pulled the plug to kill it
Had to cover the throat of the carb to get fuel up the line and to the carb..once it was there it stayed...no air
It also had fuel sitting in the carb throat...Plug was soaked
thanks
Eric haynie
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- Joined: Sat Oct 27, 2007 9:33 pm
- Vintage Karting items owned: margay concept
Re: Ran yesterday...Wont run today
also I killed it and started it probley 5 times last night...started right up each time
Re: Ran yesterday...Wont run today
Do you have spark?
Do you have compression?
Lots of times I have seen these old engines fire right up but then get in a funk. Condenser goes bad, coil didn't like all the attention. Needles are stuck in the wrist pin and come out and tear up a cylinder but you would never know it until you start to dig.......
Do you have compression?
Lots of times I have seen these old engines fire right up but then get in a funk. Condenser goes bad, coil didn't like all the attention. Needles are stuck in the wrist pin and come out and tear up a cylinder but you would never know it until you start to dig.......
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Re: Ran yesterday...Wont run today
It has good spark and compression
Re: Ran yesterday...Wont run today
Same thing happened to me at TBO. Turns out it sucked a reed. These old reeds break really easy and the engine runs really bad with broken reeds.
Re: Ran yesterday...Wont run today
Oh yeah, that was after we swapped out the bad coil...
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Re: Ran yesterday...Wont run today
Ahhh... the joys of vintage karting!
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Re: Ran yesterday...Wont run today
Reeds are okay...
I took carb apart blew everything out ,reassembled, started it, It ran for maybe 10 seconds and flooded out.
Eric
I took carb apart blew everything out ,reassembled, started it, It ran for maybe 10 seconds and flooded out.
Eric