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Keep & Kill
Last Post: Crusty
Posted On: 21 Minutes Ago
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1 Week Ago
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Senior Master Custom Bike Builder
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Join Date: Jun 2008
Location: Cornelius, OR
Posts: 10,278
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He probably has the idle set wrong because it works backwards from other carbs.
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1 Week Ago
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XL FORUM TEAM MEMBER
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Join Date: May 2010
Location: Pottstown PA.
Posts: 16,320 Sportster/Buell Model: XLCH stroker Sportster/Buell Year: 1960 Sportster/Buell Model #2: 883 C Sportster/Buell Year #2: '03
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^^ thanks for re-mentioning that.i should go back and turn that screw back in a bit.
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72 1000cc barrels and XLR heads, S&S 4-1/2'' flywheels, sifton minus-minus cams, S&S super A w/ zippers thunderjet w/yost powertube, Andrews gears,and shafts, 72 oil pump, Morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
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1 Week Ago
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Senior Chief Know It All 1st Class
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Join Date: Oct 2019
Posts: 1,185 Sportster/Buell Model: 883 Evo Sportster/Buell Year: 1989
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No matter which way it turns, you're looking for the best, highest idle quality
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1 Week Ago
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XL FORUM TEAM MEMBER
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Join Date: May 2010
Location: Pottstown PA.
Posts: 16,320 Sportster/Buell Model: XLCH stroker Sportster/Buell Year: 1960 Sportster/Buell Model #2: 883 C Sportster/Buell Year #2: '03
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^^^ i had it there,and wanted to end up on a tad richer.
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1 Week Ago
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XL FORUM TEAM MEMBER
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Join Date: Jun 2009
Location: Sunshine Coast
Posts: 9,354 Sportster/Buell Model: XLB, XLCH, Sporton Sportster/Buell Year: 1962 Sportster/Buell Model #2: XLCH Sportster/Buell Year #2: 1966 Other Motorcycle Model: XLCH (Another one) Other Motorcycle Year: 1966
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Screwing things doesn't always make you richer.
You could lose your house.
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"I know only too well the evil that I propose. But my inclinations get the better of me."
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1 Week Ago
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XL FORUM TEAM MEMBER
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Join Date: Jun 2012
Posts: 592 Sportster/Buell Model: XLH Sportster/Buell Year: 1969 Other Motorcycle Model: Softail Slim Other Motorcycle Year: 2016
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I'd bet that the straight trough pipes are a factor here. In tuning the VM-9, the engine needs to be completely warmed up and , starting with the idle, you want a setting between bogging down and missing when revving. If you get hesitation when revving , you're on the lean side. Very gradually richen the idle mixture screw vvery small increments at a time. Once that it set up, take it out and see how the intermediate setting is--same deal: hesitaton means lean; bogging means rich. Then, move the clip on the needle jet in whatever direction smooths out the issue. I run VM-9's on all of my old Harleys--have for 50 years and I love them. As mentioned, te straight pipes may be the issue here.
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1 Week Ago
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XL FORUM TEAM MEMBER
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Join Date: Jun 2009
Location: Sunshine Coast
Posts: 9,354 Sportster/Buell Model: XLB, XLCH, Sporton Sportster/Buell Year: 1962 Sportster/Buell Model #2: XLCH Sportster/Buell Year #2: 1966 Other Motorcycle Model: XLCH (Another one) Other Motorcycle Year: 1966
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Quote:
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Doc 306 : I run VM-9's on all of my old Harleys--have for 50 years and I love them.
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And here's the thing. Exactly why I don't like them. It's not hard when you've spent 50 years tuning engines, all kinds of engines. But for inexperienced people they are a lot more difficult to get right. They are not as forgiving as a Super B. |
1 Week Ago
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Senior Chief Know It All 1st Class
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Join Date: Oct 2019
Posts: 1,185 Sportster/Buell Model: 883 Evo Sportster/Buell Year: 1989
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All of this assumes that he actually has a VM38-9.
Until he opens it up, he doesn't know what he has. Some of the other jetting specs will be so far off the bike cannot be ridden.
Hint: there are also VM38-1, -2, -3...
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1 Week Ago
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XL FORUM TEAM MEMBER
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Join Date: Jun 2011
Location: On a farm
Posts: 7,422 Sportster/Buell Model: XL77.2R Sportster/Buell Year: 2006
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The first two numbers are throat size and the / or - number is the flavour. VM38/21 are made for snowmobile. Might work but too many ?????
Follow manufacturer recommendation, oups, we are mostly men here and don't or never find them in the box or garbage can.
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1 Week Ago
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XL FORUM TEAM MEMBER
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Join Date: Feb 2009
Location: ny
Posts: 987 Sportster/Buell Model: sportster stroker xlch Sportster/Buell Year: 1970 Sportster/Buell Model #2: sportster xlh Sportster/Buell Year #2: 1973 Other Motorcycle Model: 99 inch sportster Other Motorcycle Year: 2003
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Quote:
Originally Posted by kitabel
All of this assumes that he actually has a VM38-9.
Until he opens it up, he doesn't know what he has. Some of the other jetting specs will be so far off the bike cannot be ridden.
Hint: there are also VM38-1, -2, -3...
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+1
Whitewalls posted a VM38-9 sold by MOTOCARB UK that has a 40 pilot jet.
Other sellers like OZ and Sudco come with a 30 pilot jet. |
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