Carb Adjustments

[gamorg02]

Update. I pulled my diaphrams last night and all my eclips are one the 4TH notch from blunt end. Also last time i messsed with them, im not even sure how this happened, the back two carbs when i pulled off the covers the little washers that are supposed to be under the little springs under the big plastic screw, were laying in the cover. Both carbs. I dont know wtf happened there. so i put each clip on the 3rd notch from end (leaving two open notches to blunt end) and took it out and man it ran like ****. i came back pulled one of the carbs and noticed i had the spacer with the tit on it upside down. i put it right and left them all at 3rd clip. order went : spaceer with tit towards carb, then eclip, then washer, then small spring then big plastic screw.

this morning running at apprx. 2700 to 4000 rpms the bike ran flat. and kinda surged a bit. if i held it at each rpm it just blatttt ran flat. im gonna move them back to the 4th clip but what is this telling me? that I need to go up one size on my main jets? Im trying to relieve my poor fuel mileage problem.

hmm okay. well a bigger jet def isn't gonna help your poor mileage.

does WOT work well? or is it only stumbling while holding at each RPM/ does this happen above 5.5/6k rpms?


u need to describe the 'flat' feeling more.

lean, is surging, like it wants to go just can't. it stumbles n whatnot.

rich, is harder to explain, to me it feels wet/flat. like there just isn't more power its flat.

 

[Redbone]

I just asked them for a $1.99 bag of little washers and the kid grabbed them right away.

You're running stock set-up Brian?

Thanks for the info guys, I'll pickup a bag next time I'm near the RS.
Yes I am, but I think I have found my answer to upgrading to a jetted carb. I was able to secure a set of carbs that already had Sean's kit installed. I will report back when I get it set up on Redbone. :thumbs up: :thumbs up:

 

[dannymax]

Yeah, but I think I have found the answer to upgrading to a jetted carb. I was able to secure a set of carbs that already had Sean's kit installed. I will report back when I get it set up on Redbone. :thumbs up: :thumbs up:

WHOA...good deal!! Can't wait to hear how it goes! :eusa_dance:

I had to let a similar opportunity go by cause Omama wouldn't cut loose any 'bail-out/monkey money', the ********!!! :damn angry:

Been most bummed ever since!! :sad2:

 

[gamorg02]

redbone, with the modified airbox? u may still have to fiddle a bit.... just an FYI...

 

[Redbone]

I know it won't be just a bolt on affair, but the carbs are coming off a bike that is jetted for the same altitude so I should at least have a head start with the jetting. I have been keeping notes and will call on our resident experts when I get tripped up.

 

[gamorg02]

I know it won't be just a bolt on affair, but the carbs are coming off a bike that is jetted for the same altitude so I should at least have a head start with the jetting. I have been keeping notes and will call on our resident experts when I get tripped up.

they know more, but let me know if i can help at all.




BIGMO, let us know how u make out.

 

[BIGMO]

hmm okay. well a bigger jet def isn't gonna help your poor mileage.

does WOT work well? or is it only stumbling while holding at each RPM/ does this happen above 5.5/6k rpms?


u need to describe the 'flat' feeling more.

lean, is surging, like it wants to go just can't. it stumbles n whatnot.

rich, is harder to explain, to me it feels wet/flat. like there just isn't more power its flat.

When I hold the throttle at a steady rpm anywhere between 2700-4500rpms it looses power a bit and surges. like as you are describing a lean condition. since i dropped the needles one clip to the 3rd spot fropm end, i can see where that would be true. I am going to put the clips back to the 4th spot from end to make sure that fixes my surging problem. But that still doesnt help me with my mileage. When i said up one size on the main i figured that way i could lean it out with the needles, like putting them on the 1st or 2nd spot from the blunt end. Im just graspin at straws, just guessing. Im looking for ideas.
Ill let you guys know if moving to the 4th spot from end clears up my surging.

 

[gamorg02]

cruise, among other things is some needle in that range. not so much the 2.5k to 3.5k but the 3 - 5k definitely (i think, but it depends). get your surging figured out first, if ur surging (lean) thats not where your mileage issue should be coming from, since the engine isn't getting enough gas in its mixture anyways.

what about 4500 - 6.5k cruise? stumbling/surging or smooth?

you're floats are good eh?

do a couple WOT runs. then put the choke on so the idle speed ups maybe 500 rpms. then do a copule more WOT runs, did it get worse or better? (too lean if it gets better)

then turn the bike off for a few minutes. enough to cool it down, but short enough so its still warm, do another WOT run, did that make it better or worse? (too rich if its way better now that the engine is cooler).

do u have O2 bungs on your exhaust?

what exhaust are u running?

i'd also find out for sure what mains you're running, can u find out from mark?

 

[BIGMO]

im running the old style 4-2 UFO exhaust, Morley Muscle kit airbox stage 7 needles. Ill find the procedure for checking the floats just to be sure. they coulda got screwed up in shipping or when i was putting them on. I wasnt surging when the clips were 4 from the end, the surging started after i moved the clips 3 from the end. Say I move these back to the 4th clip and no surging, like it was before, what should a guy try next?

 

[gamorg02]

go back to how your needles were.

check ur wet levels first. if they're close, we can work with it, but if they are wayyyy off then u'll have to tear into them. if mark did 'em, i wouldn't be worreid tho, unless someone played rugby or football with the box via shipping.

then, try your main jet tests i was talking about from above...

do a couple WOT runs. then put the choke on so the idle speed ups maybe 500 rpms. then do a copule more WOT runs, did it get worse or better? (too lean if it gets better)

then turn the bike off for a few minutes. enough to cool it down, but short enough so its still warm, do another WOT run, did that make it better or worse? (too rich if its way better now that the engine is cooler).

i'd also find out for sure what mains you're running, can u find out from mark?

 

[BIGMO]

OK changed the clips back to the 4th notch. Did another carbsync right on the money. took it out for 60 miles or so. Runs really well like before. Slight copugh, stumble, i mean ever so slight at around 3 grand. if the needles dont really effect the mileage then cant I put a radio shack spacer in there to clean up the stumble? its so small i may not mess with it but wth it only takes 45minutes to adjust the needles. Before I did all this I got exactly 70 miles before the light came on for reserve, this is all in town riding at 3,ooo rpm apprx. 35 mph. thats 23 mpg! its gotta get better. Ill check float levels next time im working on it and let you guys know.

 

[gamorg02]

u have anywhere u can get some a/f readings from?

 

[RagingMain]

Sorry I havent taken the time to read all three pages so forgive me if this has already been covered.
Do you have the stock springs or shorter ones???
If they are stock and your stumble is at 3k a shim isnt going to do any good. The needles dont start to open until 4k and above. On my bike they dont even start to open until 4200-4500 depending on my throttle postion. I can see this on my A/F meter.
If they are the shorter springs then yes a shim should help.
Cheers

 

[gamorg02]

doesn't it depend on throttle position for the 3k stumble? if you are at WOT, it might be slight needle, but if you are crusing, light accel, thats probably not needles. could be a/f mixture?

 

[RagingMain]

doesn't it depend on throttle position for the 3k stumble? if you are at WOT, it might be slight needle, but if you are crusing, light accel, thats probably not needles. could be a/f mixture?

Yes, exactly.

 

[gamorg02]

Yes, exactly.

sounds like i'm learning. now we're digging where there's fireballs.

 

[BIGMO]

OK its been raining a ton lately (9" 2 days) and I hadnt gotten to ride for a while. I went back and adjusted the needles back to 4th clips from blunt end. as stated above. I got to thinking that its really hard to tell what mileage im getting by driving around town, stop and go etc.. So i filled it up and took the kids on 20 miles rides. 3 kids 20 miles got me to 60 miles. Then i rode around town the rest of the tank. This morning coming to work the reserve light came on at 98 miles. Whoo HOooooo. Im not sure if it was something i had put in wrong last time i adjusted the needles, remember i found two washers in my caps. Or what the deal was but it is apparently fixed. I still am going to put a shim in to see if that cleans up that 3000 rpm stumble. but it doenst really effect it that much and may be hard for others to feel it but im on it daily so i may screw with the washer space jsut to try it. Now if I can figure out how these guys are getting 38 miless to the gallon. lol.

 

[gamorg02]

OK its been raining a ton lately (9" 2 days) and I hadnt gotten to ride for a while. I went back and adjusted the needles back to 4th clips from blunt end. as stated above. I got to thinking that its really hard to tell what mileage im getting by driving around town, stop and go etc.. So i filled it up and took the kids on 20 miles rides. 3 kids 20 miles got me to 60 miles. Then i rode around town the rest of the tank. This morning coming to work the reserve light came on at 98 miles. Whoo HOooooo. Im not sure if it was something i had put in wrong last time i adjusted the needles, remember i found two washers in my caps. Or what the deal was but it is apparently fixed. I still am going to put a shim in to see if that cleans up that 3000 rpm stumble. but it doenst really effect it that much and may be hard for others to feel it but im on it daily so i may screw with the washer space jsut to try it. Now if I can figure out how these guys are getting 38 miless to the gallon. lol.

the shim may or may not help ya out. not sure. how long are your springs? i'll compare them to mine and we'll find out if they're stock or stg7 springs.

sounds like mileage is right about where mine is/

i forget as well.

do a few different runs..

cruise/slight accel/medium accel/ heavy accel/WOT.

which is the 3k stumble worse @? and its def a lean stumble, right?

 

[BIGMO]

Il check spring length next time im in them and let you know. Id like to know myself. Thats the only problem with buying a Vmax with all the goodies already installed. You dont know the particulars of what was installed.

I dont even know what to call it. it seems like the lean condition when i was at 3 clips but much much less. and its just for a bit. It happens when I hold it at 35 mph 3,000 rpms cruising. I doubt anyone not vmax familiar would notice it too much but i can. If i am throttling up slow medium or WOT its not there at all, least that i can notice.
Right now its running pretty damn good so i may jsut leave well enoguh alone and just ride. but if i get a nice day and nothing to do ill shim it once and try it. wtf its only time and 1.99$ for washers. lol.

Thanks for all the advice. Appreciate it. In the end i think my problem was the needle assemblys were not put back in correct last time i adjusted the needles. two washers wernt even in the assmebly they werein my covers and i think one of the nipples was facing the wrong way under the eclip. It all seems good now. Boost ON!

 

[gamorg02]

yea those nipple clips will throw things off

if u only feel it at cruise, the shim (probably) wont' help, but its possible... u may want to pop ur a/f screws out 1/4 - 1/2 turn each, see if that helps. i don't like messing with mine tho, b/c i can never get 'em back without a gauge

only way to know for sure tho is to get an a/f meter on them at different rpm's/throttle positions.