Got a LS650 Savage project but have had a hard time getting it to run right It's 666cc with 10.5 to 1 but my jetting sessions is pissing the missus off lol'. When it was stock it ran smooth with a 250cc round slide but I was merely testing. After that a flatslide 40mm Mikuni on stock motor but was only good over 3000rpm. Should I continue on up with the round slides to 36mm - 38mm - 40mm? or go back to the 40mm Flat slider https://www.facebook.com/photo?fbid=407440227181774&set=a.111829973409469 what do you guys think never had trouble like this with car's.
kingfisher21,
Jan 27, 8:19pm
40mm is pretty big for a 666cc single, a 36mm round or flat slide will do the job. I think standard is 40mm buts thats a CV carb, way different to a normal pull cable carb.
Yeap stock is the BS40 C.V Mikuni. I guess I'm asking which one has a better spray mist? Flat or Round slide the ports are smooth as.
absolute_detail,
Jan 27, 9:00pm
I ran a keihin fcr 41mm carb on my xr600. Cheap to buy and a million different jets for them
hotelcarpet,
Jan 27, 9:38pm
hahaha Jets yeah that's the trouble, not like the cars drop on and go :)
absolute_detail,
Jan 27, 10:06pm
The fcr carb is off a motox bike so the jets are very easy to change
hotelcarpet,
Jan 28, 4:18pm
How come the needle must be different # 6FJ6 Vs 6DP1
36mm VM carb needle #6FJ6 needle jet #159 Q-5 slide #VM36/36-2.5 needle valve #VM34/39-3.3 air jet #BS30/97 2.0
38mm VM carb needle #6DP1 needle jet #166 Q-2 slide #VM/38-2.5 needle valve #VM34/39-3.3 air jet #BS30/97 0.5
trouser,
Jan 28, 5:13pm
Because it regulates a bigger jet. It will also have a different profile.
hotelcarpet,
Jan 28, 5:38pm
Very minutely tuned aren't they for a 2mm variation. weve decided to sell the bike with a down draught pipe it looks ugly but has calibrated the rest of the bike watch my profile for up coming listing guys be around 5K the bikes certified and will come with a woF and abit of rego.
kazbanz,
Jan 29, 9:57am
Personally I subscribe to the theory. "if it ain't broke don't fix it." So go back to the factory carb, factory settings and use that as your start point. I assume the mains are cheap enough and the needle has multi groove. -or easily stacked with washers. That said it would seem that its a lot more than just a big bore kit that's been done. How is the carb breathing? How restrictive is the exhaust ?
hotelcarpet,
Jan 30, 6:37pm
as above its away just extended the inlet pipe to down draft but didnt like the look of it.
kazbanz,
Jan 31, 2:06pm
So biggish single No backpressure and no air filter.? I would still be going back to factory carb/factory settings as my start point. At least eliminate that variable from the calculation. I suspect its going to be running lean as heck like that and you will need one main size bigger to get it to begin to run right.
hotelcarpet,
Sep 20, 2:58am
as above its away just extended the inlet pipe to down draft but didnt like the look of it used an old car carb.
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