Hello folks,
I have fitted my new AMAL 930's to my t140v 1977 after a top end rebuild, so still running in.
Timing is fixed (thanks to all for the help).
So, back to the Amals. They are brand new, with a main jet 200, needle 106 on the middle clip and pilot bush valve 3. According to the manual, the standard main jet should be smaller at 190.
Here's how she runs.
Start and idle - fine.
1/8 speed, slowtake off - fine
18 - 1/4 speed, hesitate, then slow acceleration
1/4 - 1/2, lumpy and horrible - like its on running on one cylinder
1/2 to full, will not rev to full, lumpy and horrible - like its on running on one cylinder.
Everything gets worse as she warms up/gets hot.
Plugs are sooty.
Will dropping the size of the main jet to 190 or 180 make that much of a difference?
Any other things I should try?
Cheers,
Richo
I have fitted my new AMAL 930's to my t140v 1977 after a top end rebuild, so still running in.
Timing is fixed (thanks to all for the help).
So, back to the Amals. They are brand new, with a main jet 200, needle 106 on the middle clip and pilot bush valve 3. According to the manual, the standard main jet should be smaller at 190.
Here's how she runs.
Start and idle - fine.
1/8 speed, slowtake off - fine
18 - 1/4 speed, hesitate, then slow acceleration
1/4 - 1/2, lumpy and horrible - like its on running on one cylinder
1/2 to full, will not rev to full, lumpy and horrible - like its on running on one cylinder.
Everything gets worse as she warms up/gets hot.
Plugs are sooty.
Will dropping the size of the main jet to 190 or 180 make that much of a difference?
Any other things I should try?
Cheers,
Richo