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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 21st June 2012
wayfastf150 wayfastf150 is offline
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Default Take a peek at my plugs 1250 jetting

I have about 400 miles on my 1250 conversion. I read a good baseline would be 45 pilot, 185 main, and a shim under the needle with 2.5 turns out. When I went to install the jets, I saw the PO put a dynojet kit in so I dropped the clip one position (4th notch down I believe), did the 45 pilot with 2.5 turns out and a dynojet 186. The bike was a 1200 bored .010 over, and the PO had a 45 pilot in there with a 168 main jet (dynojet number). I do have popping when I shut the throttle, so I was going to try to turn the screw out another 1/4 turn, or go to a 48 pilot. While looking for jets I found a chart which compares dynojet numbers to keihin and mikuni. According to the chart the dynojet 186 main is equivalent to a keihin 210 which seems way too fat. Is there any truth to those numbers? Someone gave me a CV to use as parts (carb body is junk) so I can get rid of the dynojet kit.


Front plug


Rear plug
Both plugs were replaced with autolites when it was rejetted
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Old 22nd June 2012
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looks just a tad rich to me
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Old 22nd June 2012
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Default Did you do a plug chop

I do one for slow, intermediate and high speed (WOT)
http://www.mopedarmy.com/wiki/Plug_chop
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Old 22nd June 2012
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I have not done my plug chops yet, I wanted to wait until I finished my break in. I have checked the plugs a few times to make sure it isn't lean.
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Old 22nd June 2012
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I ran the cvp kit and I love it!

46 pilot cvp needle (0.50 shim) and a 180 main and a lighter spring a drilled diaphram

Bike runs awesome! Really smooth and burns clean.
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  #6  
Old 22nd June 2012
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This is the chart I was looking at, does it look accurate? http://www.jetsrus.com/FAQs/FAQ_miku...ihin_sizes.htm If it is, looks like Im 9 or 10 jets too fat. Ive read the stickys on carb tuning and reading plugs, and did a lot of searches on here from what Im seeing I should be around a 45/48 pilot and 185/190 main. The bike has screaming eagle slip-ons with no cross over, stock filter, and if I remember correctly N4 cams.
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Old 22nd June 2012
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Quote:
Originally Posted by NRHS Sales View Post
looks just a tad rich to me
???? the porcelain looks white to me, I thought white meant lean, no?
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Old 22nd June 2012
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They look ok to me. notice the light black shading around the base below the threads.Thats where the jetting really shows. And why Dan said maybe a tad rich. But without individual plug chops lik EL stated, you wouldnt know which circuit to change.
Cant see in the pics how far up the strap the heat band goes. That is the point on the electrode strap where it changes color from heat. Should be about halfway up the strap. This is JMO and how I do mine...
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  #9  
Old 22nd June 2012
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Do you guys think I will be alright to do plug chops with 400 miles on the top end? If I understand it correctly when doing the mains you just have to hold it wide open clutch in and hit the kill switch, you dont have to have it rev to full throttle revs correct?
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Old 22nd June 2012
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Sorry no answers for you but there is GREAT info here so I need to subscribe...
Thanks guys!
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