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Message started by Scottwerty on 10/28/06 at 19:00:44

Title: White spacer- Going full space??
Post by Scottwerty on 10/28/06 at 19:00:44

Ok heres the scoop I have a dyna muff 19" straight shot style with no baff. went to rejet for it and Bike shop only had 2 main jets in the savages range 147.5 & 157.5 so i opted for the 157.5 and installed with a Full white spacer after a 2/3 spacer left me a hard start and black smoke. Is this okay to do knowing that my jet is probably too big with a space mod? Currently stock pilot, 157.5 main, Full spacer, with K&N with no smoke.

Title: Re: White spacer- Going full space??
Post by barry68v10 on 10/28/06 at 19:20:11

How is your low RPM throttle response and mid-range power?

Title: Re: White spacer- Going full space??
Post by steelwolf on 10/28/06 at 21:35:31

Lancer could probably tell you better but that main seems to be way too big. I am running a straight hollow pipe as well but only a 1/2 spacer and a #55 pilot and a 152.5 main. Better wait on a response from a better source first though.

Title: Re: White spacer- Going full space??
Post by lancer on 10/28/06 at 22:11:15

The #157.5 is VERY LIKELY TOOOOOO BIG. The main jet being too big will make it run rich for sure but will not hurt it like a sever lean condition can do. Try to get a #152.5 and #155 MJ to put in it.
With the stock pilot jet still in it, what is the # of turns out for the pilot air adjusting screw?
Any backfiring?

Title: Re: White spacer- Going full space??
Post by Scottwerty on 10/29/06 at 07:14:56

Pilot is 2 3/4 out a couple pops after slapping the throttle a couple of times does have some black smoke in the mid range. I will be putting a 55 pilot and a 152.5 in her. my main question is this how important is it to reduce the white space? with bigger jetting is it really a big deal?

Title: Re: White spacer- Going full space??Ihave a
Post by luken on 10/29/06 at 08:24:23

Im at 155 and 55. It has been running great but lots of smoke. I put on the sportster muff but didnt to the neck anlge peice so the brake lever on the rear is black from the exhaust. Not good, the brake calbe rubs against the sprty too, will be fixing that soon though. I have been thinking of going back to 152.5 because my air screw has no noticable affect when I turn it.

Title: Re: White spacer- Going full space??
Post by azjay on 10/30/06 at 05:28:46

Scottwerty wrote:

that is why i ran 2/3 spacer when i first jetted up to #155, when i jetted to #152.5 i went 1/2 spacer. i suggest, you put in that phat jet, and leave the spacer alone, and see what you get. tuning carbs is not an exact science, what works for me in the southern desert @ -47ft, is not the same that will work for someone at the coast or in the rockies @ +8000ft
the pilot is affected by the pilot jet, completely seperate fuel circuit.

Title: Re: White spacer- Going full space??Ihave a
Post by lancer on 10/30/06 at 06:09:22

luken wrote:

Your main jet #152.5) has no connection with the pilot air screw adjustment. When you turn it there is NOT supposed to be any affect at all. The main jet, for all practical purposes, is responsible for 3/4 - full throttle.

The needle (and it's white spacer) is responsible for the midrange ... 1/4 - 3/4 throttle. If the midrange is running lean then file the white spacer to richen the mixture. If the midrange is running rich then use washerson the needle to lean the mixture.

The pilot jet is responsible for idle - 1/4 throttle. The pilot air screw is used to adjust (fine tune) the pilot circuit. When adjusting the pilot air screw the rule is that the adjustment should be between 1 and 3 turns out from the fully seated position. Ideally, if you have the best size pilot jet installed then the engine should run best at 1.5 turns out. Notice I said IDEALLY.
When doing the adjustments, if the engine runs best at less than 1 turn out then you need a smaller pilot jet. If it runs best at more than 2 turns out then you need a larger pilot jet. The goal is to get the best size pilot jet so that when you finish the fine tunig and the engine is purring, the setting will be between 1 & 2 turns out.

Backfiring when rolling off the throttle is primarily caused be a lean pilot circuit and/or an air leak in the exhaust system.

Changes in altitude, temperature, humidity and barometric pressure all affect a carbureted engine. If the changes are significant then rejetting may be necessary, depending on how much time will be spent in that condition. Some carbs automatically adjust the mixture for changing conditions ... the Edelbrock does that to some extent. The dial-a-jet can also do that to some extent.

Title: Re: White spacer- Going full space??
Post by Scottwerty on 10/30/06 at 13:55:26

Wow!! Thanks Lancer, Thats pretty much answers everything i will encounter trying to tame the beast.

Title: Re: White spacer- Going full space??
Post by lancer on 10/30/06 at 18:10:49

Happy to be of service. ;)