31K bored at 66,25mm fuelmixture is too rich
Moderatoren: solo, Kilroy, Stefan Philipp (M)
31K bored at 66,25mm fuelmixture is too rich
Hi i need help with jetting of mi 31K RDs.
31K cylinders bored at 66,25mm, carbon reed flanges on original reed houses, 31W carburetors (no power jet), air filter from Macro Boemer.
I try MJ 300 it was unbelievable rich it four stroking also at the half of the gas.
Then I try MJ 240 it is still too rich, but now at the 1/2 of the gas it run. At the idle it four stroking. Air screw must be opened (screwed out) cca 8 rounds (it seems crew fall out any second).
It seems I must use MJ 190-200. I have feeling something is not right )=>>.
Please can you help me?
(Choke is pushed)
31K cylinders bored at 66,25mm, carbon reed flanges on original reed houses, 31W carburetors (no power jet), air filter from Macro Boemer.
I try MJ 300 it was unbelievable rich it four stroking also at the half of the gas.
Then I try MJ 240 it is still too rich, but now at the 1/2 of the gas it run. At the idle it four stroking. Air screw must be opened (screwed out) cca 8 rounds (it seems crew fall out any second).
It seems I must use MJ 190-200. I have feeling something is not right )=>>.
Please can you help me?
(Choke is pushed)
- Holliheitzer
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Might be a good idea not to just blow some Air through the carbs, better throw them into an ultrasonic cleaner.
Especialy the Needle Jets and their air supply needs to be perfectly clean, if not your mixture will be far of to the rich side.
A high flow Filter combined with smaller than Standart Jets does not Sound like a good idea.
Do you use Mikuni Jets? Mikuni sizes refer to flow, other Brands tell the bore diameter...
greets
Florian
Especialy the Needle Jets and their air supply needs to be perfectly clean, if not your mixture will be far of to the rich side.
A high flow Filter combined with smaller than Standart Jets does not Sound like a good idea.
Do you use Mikuni Jets? Mikuni sizes refer to flow, other Brands tell the bore diameter...
greets
Florian
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MK - nice try )=>>
Vulnerability was found. It was on left pilot jet carb. Some mess was on the surface of contact. The gas was leaking around the jet, then mixture was too rich.
Now i have best feeling from MJ 300. (carb with no power jet)
Jet needle is at the second position from down. Fourth position from upper.
Now around 5000rpm with little gas it seems to be too rich.
At the what position do you recommend the Jet Needle?
Vulnerability was found. It was on left pilot jet carb. Some mess was on the surface of contact. The gas was leaking around the jet, then mixture was too rich.
Now i have best feeling from MJ 300. (carb with no power jet)
Jet needle is at the second position from down. Fourth position from upper.
Now around 5000rpm with little gas it seems to be too rich.
At the what position do you recommend the Jet Needle?