Jimmy Regan Posted August 21, 2014 Report Share Posted August 21, 2014 Elevation: 1500 ft Temp: 60 to 80 Mods Engine: vitos 397cc 4 mil long rod Head: pro design cool head. 22cc domes Exhaust: Toomey t5s Intake: no airbox lid. K&n filter w/outerwear. Tdr intake w/internal crossover tube. Carbs: 34mm Keihin PJs Electrical: 3° advance timing plate I'm currently rebuilding my motor. Going from stock bore to 66mm. Stock mikuni carbs to 34mm pjs. Also adding the cool head, tdr intake and advance timing plate. I haven't dealt with keihin carbs before and I would like some input on where I should start jetting wise. Quote Link to comment Share on other sites More sharing options...
rubberneck Posted August 21, 2014 Report Share Posted August 21, 2014 CEL needles in the middle, somewhere around a 158 main and a 48 pilot should get you close enought to fine tune Quote Link to comment Share on other sites More sharing options...
Jimmy Regan Posted August 21, 2014 Author Report Share Posted August 21, 2014 Alright thanks. Also have Boyesen reeds. If that will make much of a difference. Quote Link to comment Share on other sites More sharing options...
rubberneck Posted August 21, 2014 Report Share Posted August 21, 2014 not really that combo will get you close may need to move needle around a bit. just check your plugs. my 4 mil with PJs and T5s ran 160s at sea level and was a bit fat Quote Link to comment Share on other sites More sharing options...
Jimmy Regan Posted August 21, 2014 Author Report Share Posted August 21, 2014 Alright will do. Thanks for the help. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted August 22, 2014 Report Share Posted August 22, 2014 Idle..... Screw both choke knobs clockwise so that they are all they way in. Use paint pen, white out, tape, or something to put a mark on both knobs so you can keep track of where they are rotation wise. Not turn them both 7-7 1/2 turns out. Should idle nice. Quote Link to comment Share on other sites More sharing options...
Jimmy Regan Posted August 26, 2014 Author Report Share Posted August 26, 2014 Have the carbs apart. Throwing in a 160 main to be safe. And I'm noticing the slow jet is bigger than 48. Looked it up and stock is 55. Don't really wanna go down sizes do ik? Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted August 26, 2014 Report Share Posted August 26, 2014 See if you can get it to idle ok with the 55 with the idle set per above spec. Can always work down if it's just two slobbery feelin'. Quote Link to comment Share on other sites More sharing options...
Jimmy Regan Posted August 27, 2014 Author Report Share Posted August 27, 2014 Well that's what I'm trying to figure out. I just would have figured you'd wanna go bigger. These carbs are new to me tho. Well my whole motor pretty much will be. I'm still learning. Quote Link to comment Share on other sites More sharing options...
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