SuzukiSavage.com - WOT lean issue and silly main jet revised

jabman

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WOT lean issue and silly main jet revised
05/08/10 at 01:55:11

hello all,

as you may know i posted a while ago about a problem with my bike lean surging above 3/4 throttle despite having a 177.5 main jet Shocked

ive pulled the carb apart today for another clean by putting the nozzle of a can of carb cleaner over each passage way and making sure that the fluid blasts out of the right hole on the other side.

just to make sure everything is ok in there ive taken some pics if anybody can see anything out of the ordinary. I held the diaphragm up to a lamp and there's no holes in it.

all the jets and needle have the mikuni symbol on them so i guess there genuine

it has a 5C16 needle which according to my manual is stock for my 1993 bike

the size 70 pilot air jet is also stock

the only jets i could remove is the pilot, main and pilot air. Is this normal?

other jets and mods are im my sig

any more info just ask!!!!!

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93" savage, 177.5 main, 52.5 w/holes 3 turns out , middle circlip, 6" k&n round filter, Dyna muffler, TKAT brace

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jabman Senior Member Offline Posts: 411 England Gender:	Re: WOT lean issue and silly main jet revised Reply #1 - 05/08/10 at 07:58:08 ive still got the carb in pieces but im tempted to just put it back together and drill out a smaller jet to make even bigger one. this thing is as clean as a whistle.
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verslagen1 YaBB Moderator ModSquad Online Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: WOT lean issue and silly main jet revised Reply #2 - 05/08/10 at 08:24:44 For surging I generally see that the white spacer is usually cut down. And when it's cut down, will act like a larger jet is put in. A stack of metal washers is as good as a single one and easier to adjust.
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jabman Senior Member Offline Posts: 411 England Gender:	Re: WOT lean issue and silly main jet revised Reply #3 - 05/08/10 at 08:39:11 my white spacer is whole and the circlip is in the middle of the three slots. the midrange is PERFECT with this as is the low range this surging is only at 3/4 throttle to wide open. with that 177.5 main jet?
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verslagen1 YaBB Moderator ModSquad Online Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: WOT lean issue and silly main jet revised Reply #4 - 05/08/10 at 08:48:10 Don't know what to tell you other than that's the largest jet I've heard of in these things. And maybe you're going the wrong way What intake and exhaust mods have you done?
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jabman

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Re: WOT lean issue and silly main jet revised
Reply #5 - 05/08/10 at 08:58:37

well i have a dyna exhaust and a big big K&n air filter connected with a silicon hose to the carb.

this is really annoying me now i think a 182.5 jet and lower the needle should fix it but im going on increasingly long day rides and need some reliability, dont want something clearing up and the running super super rich. lol

it went faster when i pulled the choke out so that means lean right ?

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93" savage, 177.5 main, 52.5 w/holes 3 turns out , middle circlip, 6" k&n round filter, Dyna muffler, TKAT brace

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verslagen1 YaBB Moderator ModSquad Online Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: WOT lean issue and silly main jet revised Reply #6 - 05/08/10 at 09:22:40 i'd have to agree with you.
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jabman Senior Member Offline Posts: 411 England Gender:	Re: WOT lean issue and silly main jet revised Reply #7 - 05/08/10 at 10:06:38 i will take every tool i need to change a jet on the trip just in case
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Chief Gunner

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Re: WOT lean issue and silly main jet revised
Reply #8 - 05/08/10 at 17:48:01

JabMan,

I'd have to agree that all signs point to a lean problem.
Maybe I'm way off base, far from and expert, but is there a chance that there might be something else keeping it from getting the correct flow of fuel?
Maybe a float problem, fuel too low in the bowl and it can't keep up with the throttle demand or
Drawing a vacuum when it's trying to pull the fuel from the bowl. Engine sucking more air than it needs to burn the fuel. (choke increased the RPM)
Pinched or otherwise obstructed fuel line.

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'87 Savage, Got more invested in beer and paint then I paid for the bike. Figure that surely makes it mine!

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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28627 Tucson Az Gender:	Re: WOT lean issue and silly main jet revised Reply #9 - 05/08/10 at 17:50:03 Jets that big are compensating for an air leak somewhere... Are you down to like, 30 mpg now?....
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Routy

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Re: WOT lean issue and silly main jet revised
Reply #10 - 05/08/10 at 18:09:17

quote:
Jets that big are compensating for an air leak somewhere...
------------------------------------------------------------------
Compared to the cfpm of air being consumed at 3/4 to WOT, it would have to be a huge air leak.
Even a very small air leak would be big problem at idle.
-------------------------------------------------------------------
quote:
my white spacer is whole and the circlip is in the middle of the three slots.
------------------------------------------------------------------
Why don't I recall 3 slots on the needle ?
-------------------------------------------------------------------

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Rich
'07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055)

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verslagen1

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Re: WOT lean issue and silly main jet revised
Reply #11 - 05/08/10 at 18:54:30

Routy wrote on 05/08/10 at 18:09:17:

quote:
Jets that big are compensating for an air leak somewhere...
------------------------------------------------------------------
Compared to the cfpm of air being consumed at 3/4 to WOT, it would have to be a huge air leak.
Even a very small air leak would be big problem at idle.
-------------------------------------------------------------------

good call routy

Quote:

quote:
my white spacer is whole and the circlip is in the middle of the three slots.
------------------------------------------------------------------
Why don't I recall 3 slots on the needle ?
-------------------------------------------------------------------

early bikes had 3 slots for adjustment
that's something the epa took away from you.

yes, another good clue...
Quote:

Are you down to like, 30 mpg now?....

what's your mpg?
50 mpg would be average for mild performance bike.

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Routy Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2280 Winston Oregon Gender:	Re: WOT lean issue and silly main jet revised Reply #12 - 05/08/10 at 20:12:49 quote: early bikes had 3 slots for adjustment that's something the epa took away from you. ---------------------------------------------------------- Why them scoundrels ! Thanks Versal,......good to know.
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bill67 Serious Thumper Offline old tired Posts: 8517 genoa city wisconsin Gender:	Re: WOT lean issue and silly main jet revised Reply #13 - 05/08/10 at 20:21:21 Snowmobiles weren't CV carbs but they had 5 slots on their jet needle.
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jabman Senior Member Offline Posts: 411 England Gender:	Re: WOT lean issue and silly main jet revised Reply #14 - 05/09/10 at 00:00:46 my mpg is good i think the slide moves freely all the way up and down i have found a small exhaust leak that i will fix today!!!
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