Question about B model

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   I am seriously looking at a 40's B model that looks real good.  The issue I have is that while it idle good, as you rev up the RPM's it wants to sputter as if a coil is going bad, points bad (has been converted to a distributer from the magneto) or a carb issue.

The question I have is (1) would either of these three cause a sputtering issue; (2) any thing else that might cause it and (3) since it hasbeen converted to a distributer, how hard is it to find points, etc for it or to convert back to a magneto?

Thanks

Robby

	This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
	The Forum	Parts and Services	Unofficial Allis Store	Tractor Shows	Serial Numbers	History

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
RobbyH Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 19 Feb 2010 Location: North Alabama Points: 5	Post Options Post Reply Quote RobbyH Report Post Thanks(0) Quote Reply Topic: Question about B model Posted: 04 Mar 2010 at 10:51pm
	I am seriously looking at a 40's B model that looks real good. The issue I have is that while it idle good, as you rev up the RPM's it wants to sputter as if a coil is going bad, points bad (has been converted to a distributer from the magneto) or a carb issue. The question I have is (1) would either of these three cause a sputtering issue; (2) any thing else that might cause it and (3) since it hasbeen converted to a distributer, how hard is it to find points, etc for it or to convert back to a magneto? Thanks Robby

Sponsored Links

FRANKO Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Sep 2009 Points: 26	Post Options Post Reply Quote FRANKO Report Post Thanks(0) Quote Reply Posted: 04 Mar 2010 at 11:44pm
	Yes, what you have identified could cause sputtering or missing. I would check out in order of most likely reason first, 1. Lack of fuel. Could be a restriction from the tank into the carb, a dirty carb, or carb load jet adjusted too lean. 2. Weak spark. Could be caused by corroded points, weak condenser, or weak coil, or a low voltage to the coil. If your tractor has the later model Delco distributor, parts are readily available at an auto parts store or from vendors on this site. 3. Bad spark plugs. 4. Leaking intake valves caused by burned valves or misadjusted valve clearance. Check compression pressure in each cylinder with the spark plugs out. They should all be within 10PSI of each other. It is a good idea to check timing. That could cause a lack of power but generally will not cause sputtering. If you do all of the above you will have done a good tune-up and assuming the valves check out OK, it should run well.

Thad in AR. Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9524	Post Options Post Reply Quote Thad in AR. Report Post Thanks(0) Quote Reply Posted: 05 Mar 2010 at 6:17am
	Did they put a distributor on it or try to make a distributor out of the mag? I bought a b once that they used the mag for a dist but it wouldn't advance the timing and wouldn't rev. I put a different mag on it and it runs great.

ACJohn Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 12 Sep 2009 Location: Horseheads, NY Points: 147	Post Options Post Reply Quote ACJohn Report Post Thanks(0) Quote Reply Posted: 05 Mar 2010 at 8:50am
	The fact that is runs is key. Unless the price is an issue, if you can fix it yourself, the "fix" to the issue shouldn't cost too much unless you are buying a mag. Then you're looking at about $300 outright for a rebuilt "hot" one that will light 'er up with a 1/4 crank!!