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Message started by engineer on 09/25/11 at 17:46:15

Title: How thick is the stock spacer
Post by engineer on 09/25/11 at 17:46:15

Hello:

How thick is the stock white spacer in the carburetor slide for the needle. I know I have seen the dimension in this forum somewhere but I can't find it now and have forgotten the original thickness. Thanks for your help.

Title: Re: How thick is the stock spacer
Post by verslagen1 on 09/25/11 at 18:12:04

3C2A3D20382D203B4F0 wrote:

Lesson 3... Jetting a Savage... (blah, blah, blah,... it's about dang time!...)... :-?...

Now,.. for some specifics on the Savage and it's carb...

The Savage uses a round slide Mikuni BS40 carburetor...
Mikuni is a very popular carb, and jets are widely available at most bike shops and sites...
The BS40 used a large round Mikuni main jet,... and that's what you ask for at the shop...
The pilot is trickier,... best to take it in and have it matched, or find a link to the correct one on this site...

Mikuni jets are numbered in increments of 2 1/2... (ie,... 145, 147.5, 150, 152.5, 155, etc...) These are refered to as steps...
One step, is 145 to 147.5,... two steps would be 145 to 150... and so on...
Each step up, richens the fuel ratio...

The stock bike, in it's current US model configuration, has a #145 main jet, and a #52.5 pilot, with a 0.1" thick nylon spacer under the slide needle...
As it is... the stock bike is jetted slightly lean (smallish jets) for sea level, where it is emission tested for importation...
The stock jetting is pretty good for elevations in the 2500ft to 5000ft range...
On average, one step smaller in jet size every 3000ft elevation... That's a very variable rule... Temps and humidity make a difference too...
One step larger from stock for sea level, maybe two if it's a very humid location...

Here's a chart of the jetting that comes from the factory,... 95' to present 2011 is the same...
http://i600.photobucket.com/albums/tt82/serowbot/CarbSpecs.jpg

As a basic starting point for mods...
The most common mod to better breathing on the Savage, is to swap to a free flowing air filter (foam or k/n fabric), and install a Harley Shorty muffler...
With this mod, you are allowing the engine to breath in and out a little better, ... and it will in turn, want a corresponding increase in fuel delivery to match the extra air...
If your bike was jetted fairly well in stock configuration for your location,... adding these two mods will want about a two step increase in the overall jetting...
From stock,.. say, from a #145 to a #150 main,... from a #52.5 to a #55 pilot with a little more opening on the idle mix screw (1/2 to 1 turn more)... and a reduced spacer thickness on the needle slide from 0.1" to .066" or 0.50"... (you can sand the stock one down, or buy #4 nylon or brass washers to vary the thickness)...

Note#...#4 Teflon washer from Ace hardware is exactly 2/3 thickness of the stock spacer and will fit perfect. It comes in white or black. It is just what you want. One and only one. It will measure .066",... stock is .1"... that''s the standard starting point for a Harley muffler w/ free flow air filter....

An even more open pipe, or a cam with more lift, or other more extreme mods,... will require more jetting.

The basic tuning range will go from...
#125 to #160 with the main...
#47.5 to #60 with the pilot...
... and from 0.1" to no spacer at all on the needle jet...

Info on choosing a Harley muffler is available here...
Harley muffler guide... (http://suzukisavage.com/cgi-bin/YaBB.pl?num=1298689417)

I hope this info somehow clears things up, more so, than adding to the confusion..
It's not a cut and dry process... and many experts will disagree with each other...
... and I'm not an expert... but I have some experience...

So,.. now you know what I know... :-?...

Title: Re: How thick is the stock spacer
Post by Jockesavage on 09/26/11 at 01:00:14

Finaly a good explanation of the subject.
Only thing missing now is a good, (complete in one thread) guid for how the tank+carb+engine works together in the savage.
With proper explanations of what each part does. And pictures of it all.

Title: Re: How thick is the stock spacer
Post by Routy on 09/26/11 at 04:22:10

7E5B575F51675542555351340 wrote:

Huh ?
Are you sure you shouldn't get a little more specific w/ your question ?

Title: Re: How thick is the stock spacer
Post by Gyrobob on 09/26/11 at 07:55:50

43666A626C5A687F686E6C090 wrote:

The tank holds the gas. Gravity pushes gas into the carb. The carb then makes a fuel/air mixture which is burned inside the engine.

http://www.bluemelon.com/photo/42589/1750259-S1300x800.0.jpg?optimalizedperformance=true

Title: Re: How thick is the stock spacer
Post by verslagen1 on 09/26/11 at 13:27:02

122C273A373A37550 wrote:

[quote author=43666A626C5A687F686E6C090 link=1316997976/0#2 date=1317024014]Finaly a good explanation of the subject.
Only thing missing now is a good, (complete in one thread) guid for how the tank+carb+engine works together in the savage.
With proper explanations of what each part does. And pictures of it all.

Title: Re: How thick is the stock spacer
Post by Gyrobob on 09/26/11 at 13:52:24

392A3D3C232E282A217E4F0 wrote:

[quote author=122C273A373A37550 link=1316997976/0#4 date=1317048950][quote author=43666A626C5A687F686E6C090 link=1316997976/0#2 date=1317024014]Finaly a good explanation of the subject.
Only thing missing now is a good, (complete in one thread) guid for how the tank+carb+engine works together in the savage.
With proper explanations of what each part does. And pictures of it all.

The tank holds the gas. Gravity pushes gas into the carb. The carb then makes a fuel/air mixture which is burned inside the engine.

[/quote]
You forgot the petcock, stock and raptor version please.[/quote]

I carefully selected a pic from the right side of the bike, so I could sidestep that issue altogether. ;)

Title: Re: How thick is the stock spacer
Post by drums1 on 09/27/11 at 08:34:40

Quote:

I carefully selected a pic from the right side of the bike, so I could sidestep that issue altogether. ;)

But the man wants details! We don't want to be giving disinformation, or incomplete information to the newbies, now do we?

Title: Re: How thick is the stock spacer
Post by verslagen1 on 09/27/11 at 08:51:52

when you accept a job, you either do it or you don't.

Title: Re: How thick is the stock spacer
Post by Serowbot on 09/27/11 at 10:51:06

"The tank holds the gas. If you have a stock petcock, it sucks...then, gravity pushes gas into the carb. The carb then makes a fuel/air mixture which is burned inside the engine."
Better?... ;D ;D ;D...
http://www.bluemelon.com/photo/42589/1750259-S1300x800.0.jpg?optimalizedperformance=true

Title: Re: How thick is the stock spacer
Post by arteacher on 09/27/11 at 12:41:21

5E485F425A4F42592D0 wrote:

Bwahahahahahahahaha ;D

Title: Re: How thick is the stock spacer
Post by Gyrobob on 09/27/11 at 12:43:40

7365726F77626F74000 wrote:

tee hee,... :D ;) 8-) ::) :)