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  1. #1
    Junior Member
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    Nov 2009
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    san antonio, tx
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    69' Bonaza mini chopper - new to forum!

    hello fella's and fillet's.

    This is a bit long but "WE" are excited about this project and as excited that there is a community like OMB that share "OUR" enthusiasm. A few questions are inline! All suggestions and advice are appreciated.

    Funny story. I had a pressure washer with a 5.5 OHV Tec. and the pump went out after one season and very few hours. I looked into a rebuilt kit and it looked time consuming and not worth the effort. I looked in to a new pump and it was nearly as much as a new unit so I bought a new unit (different brand pump of course).

    So, while looking for something to mount my idle 5.5 hp horz shaft on, I found a 1969 Bonanza mini chopper on craigslist. The funny part of the story is, with 1.3 million people in San Antonio, Tx, my uncle was the one listing the bike. The bad thing about that is, I felt bad and didn't want to low ball him. I paid $100 for the rolling chassis w new tires pictured in the attachement. I don't think that's a bad deal. My 7 and 9 yr old are excited (perhaps not as much as me).

    After pulling the plastic gas tank and muffler off of the motor, I nearly got it to fit in the frame. I will have to get a new air filter to replace the big boxed filter. It's tight but it looks great in there! I'm hoping after I get a new airfilter, I can get the mounts to line up. I need to get a carb kit too. The float bowl and float look clean but something is sticking and fuel starts pouring out of the carb after about a minute of idle.

    Anyone ever put an OHV on one of these? The triangulated frame makes it difficult but I'm almost sure I can work it in there. I only understand the basic concepts of the internal combustion but not so much the different between a flat head and OHV. Does one have more torque, RPM, anything?

    The wheel sprocket is on the right side. I wanted to find a new jack shaft and mount the motor w the engine shaft on the left and pull start on the right. But the little aluminum box on the top of the head labeled "OHV" hits the frame so I may have to mount it opposite (it's okay - one of my kids is left handed). Can the rear wheel be reversed or the sprocket mounted on the opposite side to utilize the jackshaft?

    Any cons (besides fitment) of using the OHV?

    Last question. Any way to confirm the date on this thing? I can't find any markings.

    Glad I found you! Hope to hear from you! I think I have a little jewel and "WE" are excited to get it on the road!
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  2. #2
    Senior Member tomsprops's Avatar
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    Jan 2008
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    LaLaLand
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    1,914
    That's a great find . The Bonanza guy's go Banana's over these Choppers .What ever you do to make your engine fit don't cut any thing on the frame . Or the same guy's will really go BANANA'S ! The Tec OHV is that a Powersport engine ? I think those might be a lil taller than the honda clone engines you can get from Harbor frieght .
    That Chopper came with a Tec flathead engine which would be a great way to restore it . But the OHV engines put out a lot more power for the $$.
    Look over at minidoodle.com to see what it looked like originally . Enjoy

  3. #3
    WOW awesome find

  4. #4
    Senior Member
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    Sep 2009
    Location
    Michigan
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    268
    I had some issues on my Bonanza (non chopper) with running a 5.0 Honda GC motor and I made some 1/2" plates that moved the motor 1" farther forward (and 1/2" higher) and everything cleared, Maybe see if you could slide the motor forward to gain more clearance.

    LK

  5. #5
    Randy's Avatar
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    Jul 2008
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    Mechanicsburg, Pa
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    5,068
    Welcome, thats a great bike And you took full advantage of your uncle. Take your time with your new bike. It's special.

  6. #6
    Banned
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    Oct 2006
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    Rockford, IL.
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    Quote Originally Posted by ScooterTrash View Post
    The wheel sprocket is on the right side. I wanted to find a new jack shaft and mount the motor w the engine shaft on the left and pull start on the right. But the little aluminum box on the top of the head labeled "OHV" hits the frame so I may have to mount it opposite (it's okay - one of my kids is left handed). Can the rear wheel be reversed or the sprocket mounted on the opposite side to utilize the jackshaft?
    Am I missing something? Are you saying that you will turn the engine around? Are you looking for reverse only? LOL.

  7. #7
    Member
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    Oct 2009
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    Roseboro NC
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    Killer deal for a $100

  8. #8
    Senior Member marksteinhilber's Avatar
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    Jul 2008
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    Orange County California
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    227

    Awesome! Do it right!

    What a great project to work on with your son! I'm doing the same with a second one, but I'm putting it together with the Tecumseh HS40 4 hp engine that most of them came with. But the newer OHV's run and start pretty nice, and you use what you've got cause everyone wants to get riding! Looks like you have a very complete roller. Here's some pics of mine that I've had since 1970...helps to see how they were set up, what was used for throttle and clutch cover, etc... I think mine shown might be a year older than yours because it came without the jackshaft setup and is a 1969 model. I also have one like yours with a jackshaft that I'm working on for my boy.

    As others have said, the engine drive shaft will have to be on the left unless you want to run in reverse, or have some expensive gear train to reverse the shaft rotation at the jackshaft...The top of the chain is always moving forward to move the bike forward, regardless of whether the wheel sprocket is on the left or right.
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  9. #9
    Junior Member
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    Nov 2009
    Location
    san antonio, tx
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    6

    I deserved that!

    I deserved that! In fun, I made a fool of one of my co-workers. I'm a programmer but a guy over in the help desk area, sent an email to a user asking her if she needed her network hub replaced that burned out. I "replied all" to the email and publicly let him know that she couldn't answer the email w/o the hub so go replace it and ask her again! Who said there's no such think as Karma? I'm glad he didn't see me hop on my new mini bike and ride it around the block in reverse! Shaft on left! LOL Got it!

    I will not cut the frame. I will manage 'squeezing' her in there w/o any frame mods. I may take alwhite's advice and make a conversion plate to slide the motor forward but I'll have to wait until I replace the airfilter first and see if that does the trick. The mounts line up so close.

    I lied about the engine. It's actually a 5 hp OVH Tecumseh Enduro. Not 5.5. The shaft is tapered. Hopefully that means I have more options on the clutch.

    It has a rather "delicate" looking throttle assembly on it now. It looks like the same one that northern offers for a little less than $11. I'll probably pick a few of those assemblies and extra left hand grips up til the kids get used to the rake! Northern also offers two different jackshaft assemblies. I wonder if either will work out of the box..? anyone know? Northerns jackshaft assemblies

    Not looking for an original machine. The boys and I wanna ride it. Perhaps when they're out of the house and I'm too old, I'll got that route.

    Thanks for the words. Not sure why the unc sold it. He advertised it for $100. Said he paid $60 for the frame and picked up the tires for $20 each. Said he just wanted his money back.

    Great soot mark! I may steal your idea of orange (or is that an original color?). high Visibility. I've seen it on the web somewhere while querying BONANZA mini chopper
    Last edited by ScooterTrash; 11-12-2009 at 05:24 PM.

  10. #10
    Senior Member
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    Sep 2009
    Location
    Michigan
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    I think with that tapered shat you will have a lot less options for a clutch. (not sure but I usually see straight shaft stuff) - Not sure how much room you have but you might be able to run the clutch on the jackshaft.

    LK

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