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My Bolens' Story And A Carb Problem


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#1 JamesC OFFLINE  

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Posted July 05, 2013 - 02:11 PM

First, I’d like to say thanks to everyone on these forums.  I’ve learned a lot about my Bolens 1256-02 as well as others.

Second, some history behind my Bolens:
My grandfather purchased this tractor and attachments brand new in 1970 or 1971.  For nearly 30 years, he used this tractor for tilling his large garden every spring, cutting the grass in his front and back yards every summer (until the flail mower was ‘killed’ by my father), collecting tree leaves and fallen limbs in the fall, and blowing snow during the winters of Colorado Springs.  When I was big enough to hang on, I would ride around on the rear fenders while he was driving.  When I got big enough to drive it, I was in the seat and behind the wheel.  I grew up with this old girl.  When Grandpa passed, my father took her to his house and used in the winters for blowing snow.  She sat under a tarp most of the rest of the year. 

A few years ago, my father decided to move out of his home in the country and into an apartment in the city.  Those items that he did not want to take with him or could not take with him were split between my sister and brother-in-law and myself, sold, or taken for scrap.  I wouldn’t let the old girl go to scrap or get sold.  And I couldn’t trust my sister and brother-in-law with her.  So, I loaded her up and brought her south.

Her new home is much dryer and warmer.  She doesn’t have to move snow any more, and there’s no grass for her to cut (yet).  I have a small flower garden that we use the tiller on once a year, and I use her to pull the utility trailer around for some of the yard work.  Beyond that, she has an easy life right now.

My wife and I hope to move back to Colorado someday, so I’m keeping the snow blower for that.  I’d like to find a deck mower someday.  But for now, no need.

Here’s an issue I’m currently having – while she was with my father, something happened, and I don’t think the carb is set correctly.  When I got her down here to New Mexico, I replaced the air filter and rebuild the Zenith 68 series carburetor.  However, in order to keep her running smooth while working with her, I have to have the choke pull closed.  This tells me the carb is set too lean.  Using the instructions with the carb rebuild, I initially set the main jet to 1-1/4 out from seat.  I also set the main idle 1 out from seat.  She runs smooth at idle with no load.  But as soon as I pull the throttle open enough to start working, she stalls out.  But if I pull the choke closed, she fires right back up works just as she used to.

Our altitude in New Mexico is approximately 5500ft.  Any input as to proper card adjustments for this altitude would be greatly appreciated.

 

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#2 boyscout862 OFFLINE  

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Posted July 05, 2013 - 02:38 PM

Welcome to GTT. That is a good looking Bolens and the story is great. It sounds like your main high speed jet isn't letting enough fuel in. Download and chech the manual from our "Manuals Section". Good Luck, Rick

 

BTW check out the brouchures on the old Bolens. There are dozens of attachments for them, but they are getting harder to find.


Edited by boyscout862, July 05, 2013 - 02:41 PM.

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#3 JamesC OFFLINE  

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Posted July 05, 2013 - 03:56 PM

Welcome to GTT. That is a good looking Bolens and the story is great. It sounds like your main high speed jet isn't letting enough fuel in. Download and chech the manual from our "Manuals Section". Good Luck, Rick

 

BTW check out the brouchures on the old Bolens. There are dozens of attachments for them, but they are getting harder to find.

Thanks, Rick.  I'll take a look.  And thanks for the welcome.


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#4 Bruce Dorsi ONLINE  

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Posted July 05, 2013 - 05:51 PM

Some possible causes come to mind:

 

1) Main needle (high-speed adjuster) needs to be opened more.  .....Try unscrewing it 1/2 turn at a time to see if problem improves, gets worse, or stays the same.

 

2) Float level in carb set too low.

 

3) Weak ignition.  .....This may sound implausible, but a lean mixture is harder to ignite than a rich mixture.  .....Therefore, if the ignition is not up to par, choking will sometimes compensate for weak spark.

 

4) Leaking intake gaskets and/or warped flange.


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#5 superaben OFFLINE  

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Posted July 05, 2013 - 06:04 PM

Welcome to the forum! Bruce seems to have you figured out so far.  The only thing I'll add is to check compression.  Bad compression can mean bad vacuum which means it is harder for the engine to get fuel. 

 

Ben W.


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#6 crittersf1 OFFLINE  

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Posted July 05, 2013 - 11:52 PM

:welcometogttalk:


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#7 KennyP ONLINE  

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Posted July 06, 2013 - 05:41 AM

Welcome to the forum! Glad you got to save the tractor!


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#8 JamesC OFFLINE  

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Posted July 06, 2013 - 07:45 AM

Some possible causes come to mind:

 

1) Main needle (high-speed adjuster) needs to be opened more.  .....Try unscrewing it 1/2 turn at a time to see if problem improves, gets worse, or stays the same.

 

2) Float level in carb set too low.

 

3) Weak ignition.  .....This may sound implausible, but a lean mixture is harder to ignite than a rich mixture.  .....Therefore, if the ignition is not up to par, choking will sometimes compensate for weak spark.

 

4) Leaking intake gaskets and/or warped flange.

Thanks, Bruce!  I'll take a look at those.






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