Which carb ?

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Anonymous

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I have a 72 Roadster, it is running OK on the road but it misfires on the right cylinder on idle, by the looks of it due to richness. When I come home from riding, it idles at 1500-2000 revs.

Both carbs seem quite old and I want to get a new pair instead of fiddling with the old ones. But then the question arises - do I go for the standard Mk I Amals or the Mk II ? what makes the Mk II`s so much better that it justifies the extra cost (App 150 USD) ? I am not a road racer, I value reliability above performance - it is more than fast enough for me as it is.

Regards, Thore
 

Jerry Doe

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MK11 carbs

I switched to a pair of 34mm MK11's a couple of years ago. I purchased the choke cable adapter, and you have to get the MK11 inlet hoses with different clamp up manifolds. I drilled and welded 2 stubs in the manifolds closest to the head, so I could attach a balance tube.

I run a K&N air filter with mine, and have removed the standard air filter back plate.

I jetted them with the same jets as amal suggest for MK1 carbs. Bike idles perfectly all the time, and top end is great. I am very happy with perfomance and fuel consumption :wink: !

I've heard the Kehin setup might be the way to go if you want to go the whole way and spend a little more. Only reason I did not is I could not afford Kehin, did not want to take the traditional look away, and did not want to spend ages setting them up-

If you like I will post a photo of my setup here- let me know.

Jerry
 

Anonymous

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Thanks for the reply, I would like to see the photos you`ve got. Do you think the bike runs better with the twin 34 mm Mk II`s than the old Mk I`s ? I guess yours is an 850 ? Mine is a 750 and 30 or 32 mm should do fine. I want to keep it looking original so a Keihin/Mikuni switch is not an option for me.

Regards, Thore
 

Jerry Doe

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Carbs

I have hidden my bike somewhere as I'm just about to head down to New Zealand for 3 weeks.

I checked and do not have any clear photos depicting what I described. As soon as I get back I will take some close ups for you and post here, or email to you.

Hope thats not too long?
Jerry
 

Jerry Doe

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Mk 11 Carbs

Sorry for the delay, here is a photo of the MK11 Amal's on my bike as promised. I now have the cable for the chokes instead of the lever.

Which carb ?
 

Anonymous

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K&N

Hey, Jerry - what is the K&N part number for that filter? I run a pair of 32mm MK2 carbs but they are so close together I didn't think I could find an off-the-shelf filter so I made one. I like my arrangement because the filter is very large (requires cutting the oil tank for clearance) but I'd like to know what that one of yours is. BTW, that is a really clean bike!
 
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