 Mixture thumbscrew?
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Joined: May 2006
Posts: 1,025
Learned Hand
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OP
Learned Hand
Joined: May 2006
Posts: 1,025 |
Was I dreaming or did I see one of these Mixture thumbscrews somewhere? My search continues....
Anyone have input on using it? (if it wasn't a dream)
06BA,-AI,NoBfls,K&NPods,TBS,155/45,2 3/4Out,SidGapPlgs,Wirsnbrs
NawImPrityFknFarFrmOkMan
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Re: Mixture thumbscrew?
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Joined: May 2006
Posts: 1,025
Learned Hand
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OP
Learned Hand
Joined: May 2006
Posts: 1,025 |
http://www.bonnevilleamerica.com/forums/...part=1&vc=1
Looks like a big mess. Has anyone figured it out since? Or forget about it?
Ahhhh it wasn't a dream.. Or is it????? puff puff
Last edited by Reido113; 08/10/2006 8:36 AM.
06BA,-AI,NoBfls,K&NPods,TBS,155/45,2 3/4Out,SidGapPlgs,Wirsnbrs
NawImPrityFknFarFrmOkMan
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Re: Mixture thumbscrew?
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Joined: Jul 2006
Posts: 15
Complete Newb
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Complete Newb
Joined: Jul 2006
Posts: 15 |
I havent tried the thumbscrew but I havent read anything good about it either. What I did was get a d-shaped end from motionpro: http://www.motionpro.com/motorcycle/tools/90_degree_1-4_hex_driver/ It has a d-shape on one side and a quarter inch allen hex on the other side so I just used(I think) an extra quarter inch quarter inch socket(yes I meant to say that twice) that I had laying around. The d-shaped piece also has a ball bearing in it so it wont slip out of your socket. Now I have my tool that cost less than $7 and took no time to make. And it works great.
2006 Speedy (Red) with: TB pipes, AI and snorkle removed, 130 main, K&N filter
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Re: Mixture thumbscrew?
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Joined: Jul 2005
Posts: 1,378
Learned Hand
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Learned Hand
Joined: Jul 2005
Posts: 1,378 |
Same here......never read anything good bout em, but many have said they caused problems. Apparently the taper is not the same as the stock ones. At least one person posted that he put his stock ones back in after having problems. i'd pass if i were you, especially considering that once your bike is dialed in you'll not need to touch them for a long time. I slotted mine, the took a serewdriver bit and pounded a volume knob from an audio dvice onto the end. It's now just about as easy as a thumbwheel would be because it's just like having a thumbwheel ! Only difference is you have to slip it in, but hey.......that just makes it an even more pleasurable experience. 
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Re: Mixture thumbscrew?
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Joined: May 2006
Posts: 1,025
Learned Hand
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OP
Learned Hand
Joined: May 2006
Posts: 1,025 |
I will be passing on it. It is just a burning hand bear trying to get that left one adjusted. Ride 10 miles, burn hand, ride 10, burn. When will it end? I just can't get rid of a nasty backfire I'm getting. I've had the screws just about everywhere but to no avail. I have a post about that in misc. (just in case) http://www.bonnevilleamerica.com/forums/...p;page=0#134924
06BA,-AI,NoBfls,K&NPods,TBS,155/45,2 3/4Out,SidGapPlgs,Wirsnbrs
NawImPrityFknFarFrmOkMan
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Re: Mixture thumbscrew?
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Joined: Aug 2005
Posts: 2,525
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,525 |
I remember reading somewhere that a member was not happy with them because they had a tendency to vibrate loose or at least change there setting 
Erwin
05 America
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Re: Mixture thumbscrew?
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Joined: Jan 2005
Posts: 18,825
"Lighten up, Francis."
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"Lighten up, Francis."
Joined: Jan 2005
Posts: 18,825 |
My bike is running fine with thumbscrews from Bellacorse.com. However, for $40, I'd just keep the stock ones and bodge up some sort of cut-down screwdriver.
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Re: Mixture thumbscrew?
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Joined: Jul 2005
Posts: 1,378
Learned Hand
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Learned Hand
Joined: Jul 2005
Posts: 1,378 |
thats what i did as i said in my last post, and i never burn my hand. A power driver but with a audio knob pounded onto the end is just like having thumbscrews once you slot the screws.
Reido113.....as to the backfires. I used to get those for a short time but jetting resolved it. I can't say which setup caused it and which relieved it, but the neddles believe it or not have had the most effect on resolving popping and backfire issues for me. I think a properly jetted bike won't pop or backfire. So it may just be that you need to get the bike jetted right. Also, maybe consider a differnt pilot since the screws aren't helping. Might just be the pilot size is too small to allow the screws enough range to rid the problem.
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Re: Mixture thumbscrew?
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Joined: Feb 2005
Posts: 601
Adjunct
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Adjunct
Joined: Feb 2005
Posts: 601 |
I have thumb screw adjusters, with none of the above-mentioned problems..
MIKE
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Re: Mixture thumbscrew?
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Joined: Jan 2005
Posts: 9,223
Big Bore
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Big Bore
Joined: Jan 2005
Posts: 9,223 |
I have them also and do not have any problems. They are definitely a finer taper but not by an extreme amount. Next time I am dinking with the carbs, I will remove them and do a comparison to the stock screws. Tuning them is in 1/16 turns instead of 1/4 turns like I used to do with the stocks pilot screws. Right now, I have ZERO decel popping. Do I muck with them a lot? No, but when I go up to the mountains, I do change them (more turned in) from where there are set to here. If I don't, the carbs pop like yota on beans!  I find them very convenient....
"Never underestimate the power of human stupidity" - Robert Heinlein
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Re: Mixture thumbscrew?
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Joined: May 2006
Posts: 1,025
Learned Hand
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OP
Learned Hand
Joined: May 2006
Posts: 1,025 |
Quote:
Reido113.....as to the backfires. I used to get those for a short time but jetting resolved it. I can't say which setup caused it and which relieved it, but the neddles believe it or not have had the most effect on resolving popping and backfire issues for me. I think a properly jetted bike won't pop or backfire. So it may just be that you need to get the bike jetted right. Also, maybe consider a differnt pilot since the screws aren't helping. Might just be the pilot size is too small to allow the screws enough range to rid the problem.
thank you. i am trying to find tbs needles and have had no luck. the dealer here need 2 weeks to get them? go figure.
06BA,-AI,NoBfls,K&NPods,TBS,155/45,2 3/4Out,SidGapPlgs,Wirsnbrs
NawImPrityFknFarFrmOkMan
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Re: Mixture thumbscrew?
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Joined: Jun 2006
Posts: 312
Adjunct
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Adjunct
Joined: Jun 2006
Posts: 312 |
Just so you'll know you saw the thumbscrew at bellacorse.com
Beautiful Black, T Bike pipes cross pipe blocked 18 tooth.
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Re: Mixture thumbscrew?
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Joined: Jan 2005
Posts: 761
3/4 Throttle
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3/4 Throttle
Joined: Jan 2005
Posts: 761 |
Just FYI - We have in the works our own mixture thumbscrews. We're going about it the proper way, which is to take the stock screws and make the new ones based on the exact measurements of those. Made SPECIFICALLY for our bikes, these will work exactly like the stock screws. I hope to have them ready in a few weeks.
-brent
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Re: Mixture thumbscrew?
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Joined: Jan 2005
Posts: 5,172
Saddle Sore
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Saddle Sore
Joined: Jan 2005
Posts: 5,172 |
Brent, and all... I did that. Had a set made same as stock. With my setup, the bike popped on decel like crazy and I couldn't "tune" it out with the thumbscrews. I installed the stock screws and had the same results - popping like crazy. I went back to the HD thumbscrews and the bike runs fine with no popping at about 1 1/4 turns out. A little rich, but not enough to worry about. '03 America Stock pilots, 130 mains, TBS needles, slides drilled, snorkels out, airbox and stock filter drilled - 1 3/4 hole, Thunderbike pipes. 
More flags
More fun!
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Re: Mixture thumbscrew?
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Joined: Jan 2005
Posts: 761
3/4 Throttle
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3/4 Throttle
Joined: Jan 2005
Posts: 761 |
Hey Grump - Yeah, I read all about your experience. We've found that a very small percentage of these bikes are impossible to adjust out the popping with the stock screws. It sounds like your bike falls into that category. We're making the screws for the vast majority where the carbs tend to react well to the stock measurements. We'll see how testing goes...
-brent
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Re: Mixture thumbscrew?
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Joined: Jan 2005
Posts: 9,223
Big Bore
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Big Bore
Joined: Jan 2005
Posts: 9,223 |
I would buy a pair in a heartbeat Brent!!
"Never underestimate the power of human stupidity" - Robert Heinlein
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Re: Mixture thumbscrew?
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Joined: Jul 2005
Posts: 124
Adjunct
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Adjunct
Joined: Jul 2005
Posts: 124 |
Quote:
I would buy a pair in a heartbeat Brent!!
Ditto that.
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Re: Mixture thumbscrew?
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Joined: Jan 2005
Posts: 2,297
Oil Expert
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Oil Expert
Joined: Jan 2005
Posts: 2,297 |
Quote:
Just FYI - We have in the works our own mixture thumbscrews. We're going about it the proper way, which is to take the stock screws and make the new ones based on the exact measurements of those. Made SPECIFICALLY for our bikes, these will work exactly like the stock screws. I hope to have them ready in a few weeks.
-brent
I am soooooo in!
In Between the Dark and the Light..
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Re: Mixture thumbscrew?
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Joined: Jan 2005
Posts: 2,416
Oil Expert
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Oil Expert
Joined: Jan 2005
Posts: 2,416 |
"Wise men speak because they have something to say, fools because they have to say something."
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