Hello to all + Anyone using the JRC/Keihin Single Carb?

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mcampy

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Greetings everyone,

First, I'd like to say hi to everyone; I've searched around this forum for some time now and have gained some great bits of info while slowly putting a 74 MkIIA back on the road. Once the broken con rod was addressed, I was stoked to hear it roar back to life for the first time since I was in 2nd grade (1982). Now, that the excitement has died down a bit, I need to tend to the details, such as replacing the crap 932 carbs that are currently fitted. I only say that they're crap because one has a stuck slide screw (but it spins!) and the other only has one screw holding the top cap on. I can get a used pair of 932s locally for $100... or get the single 32mm JCR/Keihin kit from Walridge for <$200. I'm leaning towards the PKW, but curious to see what you guys think.

Has anybody done this?

BTW, I'm not planning on racing it, just want something for the backroads.

mark

louisville, KY
 
Sorry don't know about those carbs but I have just fitted a 40mm DelOrto to replace the Amal's which I suspect needed resleaving and what a differance. It now idles around 600 to700 rpm is a little ratty up to about 2000 rpm (needs tuning) and then after that she rocks.

I believe the carb is off a 900 Ducati not sure though and haven't had her out on the highway for long so I haven't really had a chance to see what the top end is like, still running her in you know?

Just wanted a carb that would be less hassle then the Amals, and for cruisng up to 80 mph with some economy, as I suspect you want as well, needs a little more tuning so time will tell I guess.
 
carbs

Any amals that are second hand will be worn in the slides and will not idle, especially if they are off a Commando.
If you use amals, buy a brand new pair from RGM with chromed slides as well (additional option). These will last better, maybe 25k miles.
I bought a set for my '73 Mk2a and used a k&n filter on them too, also from RGM
You can see a picture of this bike on the thread 'lowered commando'. Not the red bike, the black one lower down.
Generally, one amal only kits lack bollocks, or 'go', as you say over there..Don't know much about non british carbs, but talk to Matt Rambow of CNW, he uses a Klein setup, I think.
Good luck!
 
Interesting, I'm currently trying the dual Kehin copy kit from Ebay. All I can say is that it seems to run fine in the garage at this point.
I had no idea there was a single Kehin kit, I've seen a number of single Mikunis and Amals. You learn something every day.
 
The JRC "Superior" carb is not a Kehin COPY; it is, in fact, made by Kehin.

It is a low-budget quasi-flat-slide carburetor, nowhere near the FCR in performance; but at 4 for the price of one, a much better deal in that respect (the FCR isn't 4 times better, in my opinion).
 
GP,

Does it come jetted fairly close to the needs of a stock Norton? I wonder since so many carb kits seem to fall down on that point. Mind you so many bikes are a bit modified and that is always going to change jetting needs.
 
Yes, they are ordered for each application and should be close enough to get where they need to be with mix screw adjustment and needle clip position.
 
That might be another viable alternative then. I have in mind (as we all do I guess) a project restoration Commando that might have a single carb. I don't have the funds to do it now, but I'll finish up a couple more bikes and prehaps by then the economy will be a bit better.
 
Wow, Friday the 13th must be a lucky day for replies! Since my original post, I've ordered the single PWK kit and it just arrived yesterday, so hopefully I can test it out sometime soon. Waldridge was supposed to send me extra jets to test out, but it seems that they forgot. Haven't opened it up yet to take a look, but I will before it's installed.

Cheers,

mark
 
I've gone from stock Amals to single Mikuni to dual Mikuni and back to stock Amals. The single Mikuni ran well after minor rejetting and the mid-range was vicious. But it ran out of steam on the top. The dual Mikunis were the opposite. It ran like a freight train at the top but the mid-range lost out slightly. So it was back to stock Amals which run very well and are crazy hang on fast everywhere. Yes they are wear prone - needles, needle jets, and slides/sleeving - but I am not really putting on the miles like I used to so it's fine.

I'm not sure why everybody wants to throw them in the trash as soon as they get a new bike. Parts are very readily available.

Russ
 
If you saw mine, you'd either have a nice set of paperweights or throw them in the trash. But seriously, if I had a little more "norton cash," I would opt for the Amals, just for the tickler. I'm not kidding.

mark
 
I can't say I'd throw my Amals in the trash as relined they would probably do everything I need these days. At least the size and jetting is well chosen for a Norton.
I kind of enjoy experimenting with carbs and usually have pretty good results.
I think this is just another example of what amuses you. I've got to echo that I've always loved the tickler as it sure is a plus when trying to start a bike that has been sitting. My Goldwings are truly annoying on the first start of the season. With a tickler and a little luck you can start an old beast right up.
 
You tickler fans would really love my old Matchless single then. It has the very early Amal 276 carb on it and when you press the plunger the gas (petrol) pees out of it in a stream! :roll:

Russ
 
I bought the JRC kit for my Commando and after some teething problems that turned out to be ignition related I am extremely happy with the results.
Now that I have a decent coil my bike is a first kick starter idles sweetly and accelerates smoothly throughout the RPM range.
 
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