BAK Re-jet Update

3930 Views 51 Replies 11 Participants Last post by tranz, May 31, 2007

Retro Rich

Discussion Starter · Feb 9, 2007

Ok, don't get too excited on the title of this thread BAK lovers. Just as an FYI, wanted to let you guys out there watching for a post on my experimentation with jetting that it will probably be at least another couple of weeks. I had to cancel my order with Rage Performance yesterday--almost 3 weeks and they still couldn't get my 200 MJ shipped out. Talked to the guys at FactoryPro today (BTW, liked them over the phone--hopefully they're f/u and service is good--I'll keep you posted on that as well). They're Keihin mains are 1/2 the price of Rage's according to the guy on the phone today. Anyway, I'm having a 198, 200 and 205 sent to me and should have them in the next week and installed somethime in the next 2 weeks and find my right set-up.

I'll post BAK (hahahaha--that's just too damn corny) when I have found the right set-up on mine to give you guys something to go off of.

RR

21 - 40 of 52 Posts

Scar

· #21 · Feb 25, 2007

Retro Rich said:
Ok, got the 205 Keihin Main installed, 58 pilot back in there and also installed Cyberhick's A/F screw this morning. Put it all back together, can't road test it right now since it's pouring rain here and not looking to let up anytime soon. Fired it up though and throttle reaction through the revs seems to be good--just what the BAK wanted....more fuel!

I'll post back again once I road test it.

How many turns on the 58??
How high is the needle in the 205?

Been talking with BigT about some settings also.. should be interesting to see where this ends up... wish I was there with you guys making these changes.. maybe next "fall" I will be doing a major "tune excursion"?

barttoday

· #22 · Feb 25, 2007

Scar, what do you mean about "turns" on the slow jet?? Does it adjust kind of like the a/f screw?? Doe the main jet adjust like that too?? Just curious. My BAK is thirsty too!!

Scar

· #23 · Feb 25, 2007

barttoday said:
Scar, what do you mean about "turns" on the slow jet?? Does it adjust kind of like the a/f screw?? Doe the main jet adjust like that too?? Just curious. My BAK is thirsty too!!

Bart: You caught the "old school" terms sneaking out on me... the "slow jet" is the "pilot jet" samo, samo... A/F screw controls flow through that orifice..

Also called "slow speed circuit"..

Mainjet terms would be "mainjet", "high speed jet", "main circuit", "high speed circuit".. etc.

There's a few other terms thrown around now and then depending on the part of the country and the age of the person talking about it... basically you are dealing with two circuits here.. high speed and slow speed.. you can figure out which one they are talking about by what they are saying (if they "know" what they are talking about of course

)...

Yea, so I am talking about turns on the A/F screw.. Rich knows what I'm talking about.. a "lazy shorthand" is what I was using there.. the A/F screw is understood.. the actual "jet" is fully seated and not really "touched" itself after install.. that would require dropping the float bowl and you don't "twist" the jets in and out "x" number of turns/threads to make adjustments... I guess I forgot I was on the "main board" and was just asking Rich where his settings are taking a lot for granted... which I can do with Rich because he knows what I am talking about and what he is doing..

Sorry if there was some confusion there... hahahaha... nope, don't turn the "jets" in and out.

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barttoday

· #24 · Feb 25, 2007

OHHHHHHHHHHHHH!!! Now it all makes sense to me!!!! Two circuits!! It's like a bolt of lightening struck my brain!!

Scar

· #25 · Feb 25, 2007

barttoday said:
OHHHHHHHHHHHHH!!! Now it all makes sense to me!!!! Two circuits!! It's like a bolt of lightening struck my brain!!

Bingo yea... two circuits, one has "more control" at the low end and the other has "more control" at the top end, but they are BOTH always in play and working/supplying fuel... that is what it is all about... tuning the "circuits" and fine tuning the transition between the two... -->> another way of looking at it.

Retro Rich

Discussion Starter · #26 · Feb 25, 2007

Hey Scar,

I'm at 2&1/2 for starters with the 58; runs fine, but you know how you can't really tell until you drive it under load. The way the BAK pulls air, it would probably be safe going to a 60 or 62 with less turns on the A/F but I want to get that main right before I start toying with the pilot again. Have you ever found anyone on the web that has allen head slider tube cap screws and float bowl screws? I hate the POS phillips heads they put on this carb, they're so inclined to start stripping.

Scar

· #27 · Feb 25, 2007

Retro Rich said:
Hey Scar,

I'm at 2&1/2 for starters with the 58; runs fine, but you know how you can't really tell until you drive it under load. The way the BAK pulls air, it would probably be safe going to a 60 or 62 with less turns on the A/F but I want to get that main right before I start toying with the pilot again. Have you ever found anyone on the web that has allen head slider tube cap screws and float bowl screws? I hate the POS phillips heads they put on this carb, they're so inclined to start stripping.

I get the allen head screws in SS down at the local "Do It" place... they have a good selection.. works good in carbs.

Yea, BigT was starting with the same setup/adjustments and his was running also... I think I've talked him into going to a higher needle height with the 205 and 2 1/2 turns with the 55 pilot jet until the main circuit gets dialed totally dead on.. then and only then go to a larger pilot jet.. think the 55 will be the way to go tho if enough time is taken to get the main circuit right.. most performance/fuel mileage also... we shall see... that is how we do it on the multi carb bikes.. usually leave the stock pilot in there and work on the main circuit pretty hard.. we be talking some big HP bikes here.

== Wish ya had one of those skinny FP needles... I'll be messing with those also... more fuel through same sized jet...

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Retro Rich

Discussion Starter · #28 · Feb 25, 2007

Just got back on, forgot to tell you I'm starting off with stock needle height/unshimmed to see what it does. With the 55 pilot, I felt it's too lean since I was a hair past 2&3/4 turns on the A/F. I had the 58 in there before with the DJ needle and 210 DJ main, put everything back stock and shimmed the needle and ran it that way until today since I didn't like the DJ kit at all. I almost left the needle shimmed up while I was in there, but want to see how it does with stock needle height. I almost ordered past the 205 Keihin main, just very hard to tell how it's gonna react until I get out there and test it really good on the road.

Scar

· #29 · Feb 25, 2007

Retro Rich said:
Just got back on, forgot to tell you I'm starting off with stock needle height/unshimmed to see what it does. With the 55 pilot, I felt it's too lean since I was a hair past 2&3/4 turns on the A/F. I had the 58 in there before with the DJ needle and 210 DJ main, put everything back stock and shimmed the needle and ran it that way until today since I didn't like the DJ kit at all. I almost left the needle shimmed up while I was in there, but want to see how it does with stock needle height. I almost ordered past the 205 Keihin main, just very hard to tell how it's gonna react until I get out there and test it really good on the road.

Yea.. BigT had his running with the stock needle (205 main), 58 pilot with 2 1/2 turns and one shim under the needle... I am thinking more fuel through the main... higher needle maybe even skinnier or going to a 210 (OMG!!!).. and using the 55 slow jet...

Reason you had to got with the 58 was because the 210 was too small (like a 393/198)... main circuit first!.. bigger, bigger, bigger... more fuel... once you get to 3 shims and 2 1/2 turns on the 55 pilot if it is still lean then time for a larger mainjet.. wow!!!.. anyway... gotta get in there and work on taxes right now.. will check in later to see how ya are doing... keep it up, looking good :cheers:

Charlie D

· #30 · Feb 25, 2007

I just went to lowes and got some allen bolts
m4 x .70 x 12 mm long they could be a little longer but they seem to be long enough and they tightened up ok.

Not stainless just the black oxide coating.

Pack of 2 was 80 cents

Scar

· #31 · Feb 26, 2007

Come on Rich.. I know ya got them parts in there.. how is it going?? I gotta leave for AZ in a day or two.

Retro Rich

Discussion Starter · #32 · Feb 27, 2007

Sorry man, didn't get home from work until a couple of hours ago and didn't have any time to get on it today. I'm going to try and get out after work in the next couple of nights...I know, I'm just a big let-down

.

Friggin' work is killing me this week! Aaarrrrgh!

Green Ghost

· #33 · Feb 27, 2007

Vacation

Retro Rich said:
Sorry man, didn't get home from work until a couple of hours ago and didn't have any time to get on it today. I'm going to try and get out after work in the next couple of nights...I know, I'm just a big let-down .

Friggin' work is killing me this week! Aaarrrrgh!

Yeah, that's what you get when you take a vacation. Just twice as much to do when you get back. GG

Scar

· #34 · Feb 27, 2007

Retro Rich said:
Sorry man, didn't get home from work until a couple of hours ago and didn't have any time to get on it today. I'm going to try and get out after work in the next couple of nights...I know, I'm just a big let-down .

Friggin' work is killing me this week! Aaarrrrgh!

Yea, it's work that is screwing my sched up also.. which is why I have to go back to AZ.

BigT last time I talked to him was running one shim and the 55 pilot.. the guy who owns XXX carbs took it for a ride and thought the topend was strong, but a little fat on the lowend.. gotta screw the 55 in a little... 58 is gonna be too big..

Retro Rich

Discussion Starter · #35 · Feb 27, 2007

That's good info. Scar, thanks. I'll just have to see how it does I guess--I've always been thinking/felt the 55 was too little on this BAK, but I surely can be wrong. Mine's always had a little more "bottom end" shudder to it in the pilot circuit that I attribute to it being lean, that's why I bumped up to the 58 pilot. When I turned kept turning it out progressively on the A/F past 2&1/2, I felt it smoothed out the pilot circuit portion of the throttle. But, like I said, I could definitely be off on this. You know more about this stuff than I do...I'm more a trial and error type of guy ya know.

Scar

· #36 · Feb 27, 2007

Retro Rich said:
That's good info. Scar, thanks. I'll just have to see how it does I guess--I've always been thinking/felt the 55 was too little on this BAK, but I surely can be wrong. Mine's always had a little more "bottom end" shudder to it in the pilot circuit that I attribute to it being lean, that's why I bumped up to the 58 pilot. When I turned kept turning it out progressively on the A/F past 2&1/2, I felt it smoothed out the pilot circuit portion of the throttle. But, like I said, I could definitely be off on this. You know more about this stuff than I do...I'm more a trial and error type of guy ya know.

Yea, BigT is new at this so I'll be waiting to see what you find out... I was gonna drill out a DJ jet and make my own 205, but then I got the phone call today at lunch... will be packing tomorrow and hitting the road Wednesday.

Most of the guys I've seen running big jets and a 58 have the 58 turned down to 1 3/4 or so... that could be handled by a 55 at 2+... reason you had those problems before I believe was because of the small mainjet.. now with the 205/218 you will have more fuel everywhere.. maybe even two shims?? Find out...

I'll be checking on you until I leave and then try and get on the Internet in AZ asap... oh yea, there is a guy with a thunder hurricane on the other site that is trying to get dialed.. I told him I was leaving in another day and if he needed anything left a link to this place and told him to look for YOU :bleh::bleh::bleh: --- so I'm leaving ya with some dirty laundry :stirpot: -- I've got him headed in the right direction, but he is totally new to the tuning concept.

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barttoday

· #37 · Feb 28, 2007

Whoaaaaa!!!!

I think I have my carb dialed in pretty good for the setup I am running right now. I put in the DJ 210 main, 3 shims on the needle, 2 3/4 turns on the pilot. I left school today and turned onto a on-ramp onto the highway and like usual I let her rip in 1st. HOLY CRAP!!!! I burned out through 1st and didnt stop until I shifted into 2nd!!!!!! Never done that before, akward fishtail feeling!!! I was a dumb-a and went to put my feet out!!! HA, like that will do me any good but break both of my legs. Anyways, once I got past the initial fright, I had this big $hit eating grin from ear to ear on my face. You know, the one that says AGAIN!!!! So, I am really happy with the performance right now on my bike, but there is a little voice in the back of my head that says "you can get a little more out of it!!!!". So, I will be patiently waiting on Rich to see what he comes up with !!!!!:stirpot:

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Scar

· #38 · Feb 28, 2007

:icon_peac:icon_peac:icon_peac:icon_peac:icon_peac:icon_peac:icon_peac yea, nice when ya make it run yourself.. huh?? :cheers::cheers::cheers:

barttoday

· #39 · Feb 28, 2007

Scar said:
:icon_peac:icon_peac:icon_peac:icon_peac:icon_peac:icon_peac:icon_peac yea, nice when ya make it run yourself.. huh?? :cheers::cheers::cheers:

Yeah, it's a pretty good feeling. Had to go to Wal-Mart afterwards though and get some new tighty whities!!! hehe.........

Cant wait to get in there and get some more out of it now!!! Do they make high compression pistons for the 1300??????........:stirpot: or maybe a NOS kit???

Scar

· #40 · Feb 28, 2007

barttoday said:
Yeah, it's a pretty good feeling. Had to go to Wal-Mart afterwards though and get some new tighty whities!!! hehe.........

Cant wait to get in there and get some more out of it now!!! Do they make high compression pistons for the 1300??????........:stirpot: or maybe a NOS kit???

NOS.. yes

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