Britstuff
VIP MEMBER
- Joined
- Jan 8, 2021
- Messages
- 161
Hi:
I'm thinking about treating my Commando to a pair of new Amal premier carbs. However, there appears to be a couple of different choices. Either PACK 136: main jet 260, slide 3.5 or PACK 138: main jet 200, slide 3. Which one should I get?
I'm currently running a pair of original Amals with some wear, pretty sure the main jets are 260's, not sure about the slides. The carbs are not original to the bike. I believe my engine to be fairly standard, I think the cam is stock, valves are standard size, head does not appear to have been shaved (RH10), 0.040 rebore with flat top pistons. Peashooters without baffles and no exhaust balance pipe. Lucas rita electronic ignition. I live in Vermont and have access to and try to run on Ethanol free 90 octane gas whenever possible. Earlier type air filter. I am pretty sure it is a MK II, not a MKIIa.
Seems to me that the carbs for early 850's with the larger 260 jets would be the ones to go for?
Does anyone know why there was a change for later 1974 bikes. Emissions regulations maybe?
Thank you,
Kind Regards,
James
I'm thinking about treating my Commando to a pair of new Amal premier carbs. However, there appears to be a couple of different choices. Either PACK 136: main jet 260, slide 3.5 or PACK 138: main jet 200, slide 3. Which one should I get?
I'm currently running a pair of original Amals with some wear, pretty sure the main jets are 260's, not sure about the slides. The carbs are not original to the bike. I believe my engine to be fairly standard, I think the cam is stock, valves are standard size, head does not appear to have been shaved (RH10), 0.040 rebore with flat top pistons. Peashooters without baffles and no exhaust balance pipe. Lucas rita electronic ignition. I live in Vermont and have access to and try to run on Ethanol free 90 octane gas whenever possible. Earlier type air filter. I am pretty sure it is a MK II, not a MKIIa.
Seems to me that the carbs for early 850's with the larger 260 jets would be the ones to go for?
Does anyone know why there was a change for later 1974 bikes. Emissions regulations maybe?
Thank you,
Kind Regards,
James