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Message started by odvelasc on 05/15/09 at 18:38:50

Title: Fire and pop out the back end
Post by odvelasc on 05/15/09 at 18:38:50

So, I am definitely running lean, just not sure on what circuit. I am running a VM carb, dial a jet, a 15 pilot bled with a number 40 drill, and a 140 main jet. I get a nice flame out the exhaust when I rev at idle, a loud pop on shutdown, and snap crackle when changing gears. No leaks in the muff, and tried the air screw but no go. I cant go more rich
with the dial a jet as the engine bogs down. Please dont tell me that I have to go back into my carb and rejet to a more rich main. I am oh so tired of that. :( I have a feeling that I need a more rich main jet countered with a lean setting on the dial a jet.

Title: Re: Fire and pop out the back end
Post by verslagen1 on 05/15/09 at 18:46:45

But the dial a jet is supposed to fix that, ain't it?

To me (no exp w/dial a jet) sounds like you gotta problem with the dial a jet. One setting up and it bogs out? Does it have some sort of metering jet? I'd lean that out.

Title: Re: Fire and pop out the back end
Post by odvelasc on 05/15/09 at 19:49:19

No metering jet. I think that I have to find the right jetting and then dial the dial a jet for altitude and temp. I know that some have had to find the right jetting for best performance with the dial a jet.

Title: Re: Fire and pop out the back end
Post by dr1445 on 05/16/09 at 06:03:59

leaner on the needle clip by one? i have no experience with the dial jet since i have moved on to pumper carbs to eliminate that balancing act between rich and lean. also you might need a bigger pilot, how many tuns out is your fuel screw?

Title: Re: Fire and pop out the back end
Post by seviersavage on 05/16/09 at 06:18:43

That main seems pretty lean to me. I'm at 160, and I went to the richest setting on my dial a jet because at WOT it needed more. Now I'm good at any throttle opening. The dial a jet really is only starting to come into play at the begining and is fully involved as you approach WOT. But of course only under load. 140 just seems a little to lean.
Hey at least the jets are easy to change, just spin the carb around in the boot and drop the bowl. Your gonna love a supertrapp by the way.
Seviersavage

Title: Re: Fire and pop out the back end
Post by odvelasc on 05/16/09 at 11:03:42

3635202B262037322C29292C242836450 wrote:

Title: Re: Fire and pop out the back end
Post by Rocco on 05/16/09 at 11:18:20

screw it, make the flames bigger, buy marshmallows....and people won't tailgate!! hahahaaaa :D

Title: Re: Fire and pop out the back end
Post by marshall13 on 05/16/09 at 11:24:38

5F5446555C514353300 wrote:

[quote author=3635202B262037322C29292C242836450 link=1242437930/0#4 date=1242479923]That main seems pretty lean to me. I'm at 160, and I went to the richest setting on my dial a jet because at WOT it needed more. Now I'm good at any throttle opening. The dial a jet really is only starting to come into play at the begining and is fully involved as you approach WOT. But of course only under load. 140 just seems a little to lean.
Hey at least the jets are easy to change, just spin the carb around in the boot and drop the bowl. Your gonna love a supertrapp by the way.
Seviersavage

I dont know how I feel about the megaphone look but it is unique, and will add power. Yeah I figured I was a little lean. I just changed my needle position but it is raining today so I cant test. I will see how my ride to work goes tomorrow. Hey SS, I am only a few hundred above sea level, so I dont need to be as rich as you are. Or do I need to be more on the rich side because the air is denser down here lol?
[/quote]
lower richer, higher leaner.... more humid leaner, less richer... hotter air temp leaner, colder richer.... more o2 density, richer... less o2 density, leaner....

Title: Re: Fire and pop out the back end
Post by odvelasc on 05/16/09 at 12:40:47

7A7665647F767B7B2624170 wrote:

[quote author=5F5446555C514353300 link=1242437930/0#5 date=1242497022][quote author=3635202B262037322C29292C242836450 link=1242437930/0#4 date=1242479923]That main seems pretty lean to me. I'm at 160, and I went to the richest setting on my dial a jet because at WOT it needed more. Now I'm good at any throttle opening. The dial a jet really is only starting to come into play at the begining and is fully involved as you approach WOT. But of course only under load. 140 just seems a little to lean.
Hey at least the jets are easy to change, just spin the carb around in the boot and drop the bowl. Your gonna love a supertrapp by the way.
Seviersavage

Title: Re: Fire and pop out the back end
Post by marshall13 on 05/16/09 at 12:44:44

262D3F2C25283A2A490 wrote:

[quote author=7A7665647F767B7B2624170 link=1242437930/0#7 date=1242498278][quote author=5F5446555C514353300 link=1242437930/0#5 date=1242497022][quote author=3635202B262037322C29292C242836450 link=1242437930/0#4 date=1242479923]That main seems pretty lean to me. I'm at 160, and I went to the richest setting on my dial a jet because at WOT it needed more. Now I'm good at any throttle opening. The dial a jet really is only starting to come into play at the begining and is fully involved as you approach WOT. But of course only under load. 140 just seems a little to lean.
Hey at least the jets are easy to change, just spin the carb around in the boot and drop the bowl. Your gonna love a supertrapp by the way.
Seviersavage