which carb is better
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1st Gear
Joined: May 2012
Posts: 5
Likes: 0
From: paradise, california
which carb is better
i have a keihin carb with accelerator pump, it seems to be flooding my 1965 xlch with too much gas as well as the overflow pissing fuel. i have taken the carb down to local motorcycle shop and every time i re install it , same issue. I have an s&s carb type b without accelerator pump. does anyone know which carb would be better for my ironhead. Thanks hughmungas69@yahoo.com
Here's some links to info that may be helpful ...
Best Carb for an IronHead
http://xlforum.net/vbportal/forums/s...d.php?t=659533
Cleaning a Carb
http://xlforum.net/vbportal/forums/s...d.php?t=185361
Setting The Pilot Screw on Your IronHead
http://xlforum.net/vbportal/forums/s...ad.php?t=71361
All you need to do to fix the Keihin carb that you have is to set the float level. Post pics of the carb to help ID it and i'll see if i can post some instructions.
Best Carb for an IronHead
http://xlforum.net/vbportal/forums/s...d.php?t=659533
Cleaning a Carb
http://xlforum.net/vbportal/forums/s...d.php?t=185361
Setting The Pilot Screw on Your IronHead
http://xlforum.net/vbportal/forums/s...ad.php?t=71361
All you need to do to fix the Keihin carb that you have is to set the float level. Post pics of the carb to help ID it and i'll see if i can post some instructions.
Advanced
Joined: Apr 2012
Posts: 72
Likes: 0
From: Paris, KY
Dave
Not really. The most easy starting carb is the Mikuni VM38-9. This one is highly recommended especially for kick start bikes. The Keihins are not very efficient - they have to be set rich for the bike to run well; but they are the original carbs for L1976-on. A lot of guys seem to prefer the S&S carb but i have never tried them myself - you have to know them to get the right one [Shorty, Super, B, E, whatever].
Explaining my previous post a little more ...
The Keihin butterfly carbs [L76 to 85-on] have only two jets, the main and the slow. The main is effective at WOT [wide open throttle]; the slow covers everything else - idle, 1/4 throttle, 1/2 throttle, 3/4 throttle. So there is no way to individually tune it for these.
The 79 to 85 FSM has an excellent section detailing the operation of these carbs, with color coded diagrams. These show the idle port, the idle transfer ports [all controled by the slow jet] and the midrange port which is independent. None of these is tunable other than by changing thew slow jet.
The CV used on later models [1989-on, with the accelerator pump] is a much more efficient design. This is a very popular upgrade. But it is not a simple bolt-on; you need a new air cleaner, and there may be other problems to overcome - but lots of guys do it.
Usually available on eBay for less than $100.
The Keihin butterfly carbs [L76 to 85-on] have only two jets, the main and the slow. The main is effective at WOT [wide open throttle]; the slow covers everything else - idle, 1/4 throttle, 1/2 throttle, 3/4 throttle. So there is no way to individually tune it for these.
The 79 to 85 FSM has an excellent section detailing the operation of these carbs, with color coded diagrams. These show the idle port, the idle transfer ports [all controled by the slow jet] and the midrange port which is independent. None of these is tunable other than by changing thew slow jet.
The CV used on later models [1989-on, with the accelerator pump] is a much more efficient design. This is a very popular upgrade. But it is not a simple bolt-on; you need a new air cleaner, and there may be other problems to overcome - but lots of guys do it.
Usually available on eBay for less than $100.
Intermediate
Joined: May 2012
Posts: 27
Likes: 0
From: GA
Tore apart my Bendix (Zenith) carb last week and I've been soaking everything in the parts washer for a couple of days. The rebuild kit has come in and I spoke with a Zenith rep today who e-mailed some service tips and reassembly instructions. I would probably have upgraded to a Keeihin or a Mikuni but wanted to keep everything as close to original as possible. However, that brings me to a question .....
Question for Mick (and others) - My IH is an '81 but had the Bendix carb on it. Do you know if that carb could have still been ordered as original equipment in 1981 or am I looking at a replacement to what was original.
Question for Mick (and others) - My IH is an '81 but had the Bendix carb on it. Do you know if that carb could have still been ordered as original equipment in 1981 or am I looking at a replacement to what was original.
Trending Topics
Original for 1981 was a Keihin 34mm butterfly carb, ID = B83F. This is shown in the factory parts catalog 99451-85A.
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