06 Beta REV 250 - Page 2

thegraydog · 11-16-2012, 06:05 PM

Okay, I will go see what carb it is.
Not to be defensive, but just to set the baseline: Joe ain't just the neighbor. Colorado enduro champ in, oh, probably the sixties. Our best local mechanic for a quarter century. And his son Pat, also a national treasure, had the same Beta until a couple months ago.

So any incongruities in this discussion are mine. I'm having one conversation with the bikes, another with Joe, and another with you-all. And I'm a carpenter, not a motorhead. Thanks for the encouragement.

You'd get along great with Joe.

Mikuni.

lineaway · 11-16-2012, 06:21 PM

Quote:

Originally Posted by thegraydog

Okay, I will go see what carb it is.
Not to be defensive, but just to set the baseline: Joe ain't just the neighbor. Colorado enduro champ in, oh, probably the sixties. Our best local mechanic for a quarter century. And his son Pat, also a national treasure, had the same Beta until a couple months ago.

So any incongruities in this discussion are mine. I'm having one conversation with the bikes, another with Joe, and another with you-all. And I'm a carpenter, not a motorhead. Thanks for the encouragement.

You'd get along great with Joe.

Mikuni.

I understand why Joe jets the way he does. I have worked with and know plenty of great mechanics, some national champs of many forms of motorcycling. I also know what works in a Beta.

So if it was his bike, how did he fix the carb from over flowing? It was always a problem so wodering if you are starved for fuel also?

thegraydog · 11-16-2012, 06:36 PM

Mmmm, I'm aware that Betas parked at any angle piss fuel. You gotta fix?

(Corxn: Pat had an identical Beta, bought the same day same shop, but not this bike....)

So. I have this Beta, messing with it for education. What should I look at next? I think it is now a healthy bike; your post #10 makes a ton of sense.

You want to put your hands on it? I'll be coming over to San Y sometime this winter...

lineaway · 11-16-2012, 06:54 PM

http://www.trialscentral.com/forums/...3-mikuni-carb/
Knock yourself out, this has been going on for years. Seriously you need a 135 and a 30 pilot for the jetting. If you make it over, I`ll give you my 2 cents!

thegraydog · 11-16-2012, 07:15 PM

Oddly, this bike has always started first kick, even after months -- like a Honda vegematic.

Okay, I'm gonna get the jets, and I'm gonna come see you.

BTW, good to hear (Garrett?) got the fire. There is a steep spot in the learning curve, or fitness curve, that is pretty fun to ride or watch. Ah, youth.

DrKayak · 11-16-2012, 08:40 PM

I stopped my Beta from leaking fuel by puting a fuel filter on it. It has only started that leading when on the kickstand a very few times since adding the fuel filter. When it does I turn off the gas and run it dry then turn the gas back on and no leak. I think that carb is is very sensitive to dirt getting in the float needle.

Mine came with 27.5/145 jetting. Going to a 30 pilot made a huge difference in the way it runs. I live at 2,000ft and our club has property at 6,000ft. I think it runs great at both altitudes. Never even had the plug out of it. Best behaved 2T I have ever owned.

Never considered dropping the main to 135. Would that be too lean at 2,000ft?

lineaway · 11-17-2012, 04:52 AM

Yes, a 135 would be too lean at 2000ft. We are talking riding around 7000. You might get by with a 140, but it will be close depending on your bike and how you do the air filter.

BikePilot · 11-20-2012, 08:49 AM

Often at high altitude it helps to cut the head to increase compression to get cylinder pressure back up to about where it'd be at sea level.

laser17 · 11-20-2012, 09:07 AM

I know you said you machined some weight off the flywheel - but did you ever check for the optional FWW under the clutch basket? Some of the 250's had these mounted in seemingly random years. May explain the super slow revs. I think they added an additional couple of lbs!

thegraydog · 11-20-2012, 07:33 PM

Laser, I'm off to see my gurus tomorrow. I will present this conundrum....

lineaway · 11-20-2012, 07:53 PM

I can`t wait till I get to ride this Beta Dog!

P.S. I have not heard of anyone taking that much weight off a modern bike, since they now use plastic in the crank itself!

11-16-2012, 08:40 PM	#21
DrKayak Retro Rider Joined: Mar 2010 Location: Shingle Springs CA Oddometer: 534	I stopped my Beta from leaking fuel by puting a fuel filter on it. It has only started that leading when on the kickstand a very few times since adding the fuel filter. When it does I turn off the gas and run it dry then turn the gas back on and no leak. I think that carb is is very sensitive to dirt getting in the float needle. Mine came with 27.5/145 jetting. Going to a 30 pilot made a huge difference in the way it runs. I live at 2,000ft and our club has property at 6,000ft. I think it runs great at both altitudes. Never even had the plug out of it. Best behaved 2T I have ever owned. Never considered dropping the main to 135. Would that be too lean at 2,000ft? __________________ 06 950 Adventure 96 Beta Techno 07 450 EXC 04 FZ1

11-20-2012, 08:49 AM	#23
BikePilot Beastly Adventurer Joined: Jul 2005 Location: Tampa Oddometer: 10,901	Often at high altitude it helps to cut the head to increase compression to get cylinder pressure back up to about where it'd be at sea level. __________________ '09 Buell XB12XT, TL1000S, H1F, M620, CR250R, DR250SE, XR650R, Cota 315R Summer 2009 Ride Report http://advrider.com/forums/showthrea...1509c&t=507038 Summer 2008 RR. http://www.advrider.com/forums/showthread.php?t=367703

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11-16-2012, 06:05 PM	#16
thegraydog ^OP 2 wheels X 6 ways Joined: Aug 2004 Location: the Coconino Oddometer: 419	Okay, I will go see what carb it is. Not to be defensive, but just to set the baseline: Joe ain't just the neighbor. Colorado enduro champ in, oh, probably the sixties. Our best local mechanic for a quarter century. And his son Pat, also a national treasure, had the same Beta until a couple months ago. So any incongruities in this discussion are mine. I'm having one conversation with the bikes, another with Joe, and another with you-all. And I'm a carpenter, not a motorhead. Thanks for the encouragement. You'd get along great with Joe. Mikuni.

11-16-2012, 06:36 PM	#18
thegraydog ^OP 2 wheels X 6 ways Joined: Aug 2004 Location: the Coconino Oddometer: 419	Mmmm, I'm aware that Betas parked at any angle piss fuel. You gotta fix? (Corxn: Pat had an identical Beta, bought the same day same shop, but not this bike....) So. I have this Beta, messing with it for education. What should I look at next? I think it is now a healthy bike; your post #10 makes a ton of sense. You want to put your hands on it? I'll be coming over to San Y sometime this winter...

11-16-2012, 06:54 PM	#19
lineaway Studly Adventurer Joined: Oct 2011 Location: nm Oddometer: 763	http://www.trialscentral.com/forums/...3-mikuni-carb/ Knock yourself out, this has been going on for years. Seriously you need a 135 and a 30 pilot for the jetting. If you make it over, I`ll give you my 2 cents!

11-16-2012, 07:15 PM	#20
thegraydog ^OP 2 wheels X 6 ways Joined: Aug 2004 Location: the Coconino Oddometer: 419	Oddly, this bike has always started first kick, even after months -- like a Honda vegematic. Okay, I'm gonna get the jets, and I'm gonna come see you. BTW, good to hear (Garrett?) got the fire. There is a steep spot in the learning curve, or fitness curve, that is pretty fun to ride or watch. Ah, youth.

11-17-2012, 04:52 AM	#22
lineaway Studly Adventurer Joined: Oct 2011 Location: nm Oddometer: 763	Yes, a 135 would be too lean at 2000ft. We are talking riding around 7000. You might get by with a 140, but it will be close depending on your bike and how you do the air filter.

11-20-2012, 09:07 AM	#24
laser17 Gnarly Adventurer Joined: Mar 2008 Location: Boston,Massachusetts Oddometer: 240	I know you said you machined some weight off the flywheel - but did you ever check for the optional FWW under the clutch basket? Some of the 250's had these mounted in seemingly random years. May explain the super slow revs. I think they added an additional couple of lbs!

11-20-2012, 07:33 PM	#25
thegraydog ^OP 2 wheels X 6 ways Joined: Aug 2004 Location: the Coconino Oddometer: 419	Laser, I'm off to see my gurus tomorrow. I will present this conundrum....

11-20-2012, 07:53 PM	#26
lineaway Studly Adventurer Joined: Oct 2011 Location: nm Oddometer: 763	I can`t wait till I get to ride this Beta Dog! P.S. I have not heard of anyone taking that much weight off a modern bike, since they now use plastic in the crank itself!