It is currently Sat Aug 20, 2016 9:05 pm

All times are UTC - 6 hours




Post new topic Reply to topic  [ 15 posts ] 
Author Message
 Post subject: Reduce choke
PostPosted: Sat Jan 23, 2016 3:04 am 
Offline

Joined: Mar 19, 2015
Motorcycle: Rebel 250
Rebel: 250
Country: USA
State/Province: FL
City: Pompano
Reply with quote
I find that the choke dumps too much fuel in the bike.
Is there a way I can change the jet (if it has any), to have less fuel dump in the engine via the choke, and more evaporation (smaller droplets)?


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Sat Jan 23, 2016 4:48 am 
Offline
Forum Moderator

Joined: Sep 9, 2004
Motorcycle: Suzuki Gsf1250
Rebel: 450
Country: Canada
State/Province: NB
City: Rusagonis
Reply with quote
The nice thing about the enricher circuit is that is sort of infinitely adjustable. Just move the lever to the point where you are getting a reasonable idle and leave it there for a bit til the engine speed increases, then reduce it a bit, and so on.
brent

_________________
"If you think there's a solution, you're part of the problem" G.Carlin


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Sat Jan 23, 2016 6:39 am 
Offline
Forum Moderator

Joined: Feb 23, 2009
Motorcycle: Rebel 250 plus a few others
Rebel: 250
Country: Canada
State/Province: NB
City: Fredericton
Reply with quote
The enrichener is a starting device that is used for a few seconds to get started easily and to maintain a rich mixture for initial warmup. It is not intended to ever provide optimal combustion conditions on a sustained basis. During warmup, the enrichener circuit must be gradually closed as the carburetor's ability to vaporize fuel properly increases rapidly. There is no "tuning" necessary since the enrichener is designed to deliberately produce an overly rich mixture on a temporary basis.

_________________
2004 Honda Rebel 250
2003 BMW K1200GT
2004 BMW R1200GS
1996 Ducati 900SS
1973 Norton 850 Interstate


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Mon Jan 25, 2016 4:17 pm 
Offline

Joined: Mar 19, 2015
Motorcycle: Rebel 250
Rebel: 250
Country: USA
State/Province: FL
City: Pompano
Reply with quote
On my Rebel, the first 15-20% of the lever does nothing to enrich the mixture.
Then, at 20% or beyond, it dumps a bunchload of fuel in there, and the exhaust smells like fuel.
From 20-25% of the lever it adds fuel, makes RPM skyrocket to 3k RPM idle.
25-100% of the lever doesn't do much of any change to RPM.

So the choke at the moment acts more like a switch than a gradual turning on/off...


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Mon Jan 25, 2016 4:30 pm 
Offline
Forum Moderator

Joined: Feb 23, 2009
Motorcycle: Rebel 250 plus a few others
Rebel: 250
Country: Canada
State/Province: NB
City: Fredericton
Reply with quote
And yet the lever simply moves the brass plug in response to movement of the lever. If it's too rich when the engine starts, simply reduce choke until the engine starts to stumble and then stop reducing. Why is this even an issue for you?

_________________
2004 Honda Rebel 250
2003 BMW K1200GT
2004 BMW R1200GS
1996 Ducati 900SS
1973 Norton 850 Interstate


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Tue Jan 26, 2016 7:21 am 
Offline

Joined: Mar 19, 2015
Motorcycle: Rebel 250
Rebel: 250
Country: USA
State/Province: FL
City: Pompano
Reply with quote
Because read what I wrote above.
It's not going smooth, and dumps too much fuel. It doesn't go gradual.
It's from nothing, to too much fuel.


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Tue Jan 26, 2016 8:19 am 
Offline
Forum Moderator

Joined: Sep 17, 2003
Motorcycle: 5 Shadows, 3 Rebels
Rebel: 250
Country: U.S.S.A.
State/Province: NV
City: Las VLX-as
Reply with quote
MeeLee wrote:
On my Rebel, the first 15-20% of the lever does nothing to enrich the mixture.
Then, at 20% or beyond, it dumps a bunchload of fuel in there, and the exhaust smells like fuel.
From 20-25% of the lever it adds fuel, makes RPM skyrocket to 3k RPM idle.
25-100% of the lever doesn't do much of any change to RPM.


If "25-100% of the lever doesn't do much of any change to RPM" means the RPM drops back down, then you have a problem.

If "25-100% of the lever doesn't do much of any change to RPM" means it stays at the aforementioned "skyrocketed 3K RPM idle" then it is acting like a normal Rebel choke.

_________________
"Ride Safe, Chop Safer"
Dismantling, sawzalling, and rattle canning does not make a bobber. That's called an "ANCHOR".
Image
http://shadow-shack.20m.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Wed Jan 27, 2016 8:12 pm 
Offline

Joined: Mar 19, 2015
Motorcycle: Rebel 250
Rebel: 250
Country: USA
State/Province: FL
City: Pompano
Reply with quote
Yeah, pretty much stays on high rpm. If I close the fuel valve it gradually goes up to about 6k rpm, then it stalls.


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Thu Jan 28, 2016 3:02 am 
Offline
Forum Moderator

Joined: Sep 17, 2003
Motorcycle: 5 Shadows, 3 Rebels
Rebel: 250
Country: U.S.S.A.
State/Province: NV
City: Las VLX-as
Reply with quote
What do you mean by "close the fuel valve", is that the petcock?

_________________
"Ride Safe, Chop Safer"
Dismantling, sawzalling, and rattle canning does not make a bobber. That's called an "ANCHOR".
Image
http://shadow-shack.20m.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Thu Jan 28, 2016 11:23 pm 
Offline

Joined: Oct 24, 2008
Motorcycle: 2009 Honda Rebel 250
Rebel: 250
Country: USA
State/Province: TX
City: Dallas
Reply with quote
Mine has always been a little quirky. When the engine is cold, I can use the enricher to keep the idle at a good range to warm up, but gradual adjustment of the enricher kills it every time. I have to rev a little bit, and slide the adjustment quickly. It's always been that way since the bike was new, and I have simply adapted.

_________________
Image

Loud ties save lives


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Mon Feb 01, 2016 8:01 am 
Offline

Joined: Mar 19, 2015
Motorcycle: Rebel 250
Rebel: 250
Country: USA
State/Province: FL
City: Pompano
Reply with quote
I wonder if it's connected to the pinched choke cable issue mentioned on some threads (where the bike would stall when turning the handlebars all the way to the right...)?


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Mon Feb 01, 2016 8:05 am 
Offline
Forum Moderator

Joined: Sep 9, 2004
Motorcycle: Suzuki Gsf1250
Rebel: 450
Country: Canada
State/Province: NB
City: Rusagonis
Reply with quote
Well, there's one way to find out......

_________________
"If you think there's a solution, you're part of the problem" G.Carlin


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Mon Feb 01, 2016 6:37 pm 
Offline

Joined: Oct 24, 2008
Motorcycle: 2009 Honda Rebel 250
Rebel: 250
Country: USA
State/Province: TX
City: Dallas
Reply with quote
MeeLee wrote:
I wonder if it's connected to the pinched choke cable issue mentioned on some threads (where the bike would stall when turning the handlebars all the way to the right...)?




That's easy enough to check.

_________________
Image

Loud ties save lives


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Tue Feb 02, 2016 7:28 am 
Offline

Joined: Mar 19, 2015
Motorcycle: Rebel 250
Rebel: 250
Country: USA
State/Province: FL
City: Pompano
Reply with quote
I've only read about it, and don't know where to check...


Top
 Profile  
Reply with quote  
 Post subject: Re: Reduce choke
PostPosted: Tue Feb 02, 2016 8:36 am 
Offline
Forum Moderator

Joined: Feb 23, 2009
Motorcycle: Rebel 250 plus a few others
Rebel: 250
Country: Canada
State/Province: NB
City: Fredericton
Reply with quote
Well cable routing is very complex.. best left to the professionals.. :D

_________________
2004 Honda Rebel 250
2003 BMW K1200GT
2004 BMW R1200GS
1996 Ducati 900SS
1973 Norton 850 Interstate


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 15 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: