SPB Shifr Kit trouble

Discussion in 'Frame Mounted Engines' started by Drunkskunk, Feb 23, 2010.

  1. Drunkskunk

    Drunkskunk Member

    I'm trying to install a SPB Shifter kit on an old Columbia bike.

    Unfortunatly, even with the crank they supplied, the motor won't fit between the crank arms. its just too wide

    to the left, the brace that is welded to the bracket to support the jack shaft hits the crank arm, overlapping by > 1/2 inch.
    to the right, the clutch cover is just missing the inside of the 44 tooth chain ring, but would not clear the chain if installed.
    the motor can't go any higher in the frame, as it would hit the tank frame bar, and it can't go any further forward as the jack shaft would hit the seat tube.

    This is an adult sized bike, 26" tires.

    Everything in the kit reasonably fit the motor. I satisfied that its propperly designed, but it seems that the angle iron bracket welded to the outside of the left bearing support makes the overall kit too wide to work with the crank they supplied. I had seen pictures of the kit with out that brace. I'm wondering if its a new and not fully tested revision.

    has anyone else experienced this? Have I got a bad kit, or could I have done something wildly wrong?

    My game plan for now is to take a hack saw to the angle iron, but I'm not going to try that untill the weather is warm. that gives me time to hope for alternatives.

  2. a/c man

    a/c man Member

    Are you using a 3 piece bottom bracket, or the cartridge 1 piece bottom bracket set-up? Don't cut the piece of angle off of the side plate, it reinforces the plate from bending it is a stiffener. The side plate without the stiffener
    will compromise the integrity of plate. I believe the 3 piece set-up has a wider spindle than the cartridge type. Pablo or Ghosto will fix you up I'm sure with a solution.
  3. professor

    professor Active Member

    In doing my latest bike, I needed some more width on the crank, a one piece deal. Took it out, clamped it in the vise and re-shaped it some. I did use some heat on the thick part. Came out well. Wide cranks are available too if you want.
  4. Drunkskunk

    Drunkskunk Member

    Its the 135mm wide cartridge piece that came with the kit. I could bend the crank arm on the left, but the right side would still hit the sprocket with the chain on.

    I don't think I could use a 3 piece without major modifications, since this is a conversion from a 1 piece and the bearing cups are Wide.

    So where would I get a wider crank?
  5. a/c man

    a/c man Member

    I am using the 3 piece conversion kit from Sick Bikes on my bike which used to have a one piece crank, On the left side I have 3/8" clearance from inside the crank arm to the outermost edge of the jackshaft plate angle bracket.The right side has 5/8" clearance to the clutch cover from the inside of the crank arm. Something just doesn't jive for your set up. Can you post some pics? Are you using their crank arms too ?
  6. Hawaii_Ed

    Hawaii_Ed Member

    Sounds strange. Any way you can take a picture?
  7. Ghost0

    Ghost0 Guest

    Yes please post photos so we can see what you are seeing. I am unaware of anyone that has not had the engine not fit between the cranks.
  8. Pablo

    Pablo Motored Bikes Sponsor

    Have you contacted our Technical support department?

    I too am wondering things like what engine you have and such. We've had the left stiffener for nearly two years and never had a fit problem. The supplied spindle should be plenty wide even with the engine as low as possible.

    Please post or send pictures. We'll get it figured out.
  9. AussieSteve

    AussieSteve Active Member

    If you're using a HT engine, they're all the same width.
    The combination of the supplied BB cartridge and the supplied cranks should be wide enough for all HT engines.
    Something's not quite right, here.
    I wanna see those pics too.

    You mean the big fat alloy crank arms supplied with the kit?
    They won't bend in a hurry and might crack or break first.

    ... Steve
    Last edited: Feb 24, 2010
  10. Drunkskunk

    Drunkskunk Member

    no pics right now, its half dismantled sitting in the garage while I decide what to do with the left side brace, and it turned cold again here so it will have to sit.

    what I found is the bottom crank is incompatable with my bike. It "FITS", but can't be centered to the bike. My crank journal is the oldstyle, and wider, and the kit to convert it from 1 piece to 3 piece adds 1/4" to the total width. Combine that with a seat tube thats more layed back, and a crank t5hats higher off the ground than a modern bike, and you get a motor that needs to lean back more, which means it needs to be lower to clear the top, and fights for room with the sprockets.

    End result, it don't fit.
    I'm not giving up yet, though. I'll need to find a diffrent, wider crank.
  11. Ghost0

    Ghost0 Guest

    Question, with the adapters are you using the loose ball bearing or the cartridge style? We may have a solution for you. We have some samples coming that we are going to try with the pull start set ups and think it might solve your fit issue. I still want pics though so we can do further trouble shooting.
  12. Drunkskunk

    Drunkskunk Member

    Last edited: Feb 27, 2010
  13. Ghost0

    Ghost0 Guest

    Well I see a couple things you can try to solve your problem. First, if you remove your head and turn it 180 degrees then the plug will be pointing forward. This may allow you to raise your engine. Second we have a shorter plug that will also allow you to raise your engine. This may give you enough space to get the engine high enough to clear everything. When you raise the engine it will obviously require a longer front mount but that is the easy part.
  14. Drunkskunk

    Drunkskunk Member

    Thanks for the sugestions. It would need to go up about 2 inches to clear the pedal arm, and there are just 3 inches between the motor and the bottom of the 2 top tubes. The head would clear by your sugestion, but the carb won't. I'd still be catching my pant leg on the brace.
    There's also the problem of the bearings being too narrow.
    Plus, Astheticly, the motor looks right on the bike were it is. everything else on the bike falls into place around it.

    So how wide would the crank be for the pull start option? Will it be available with the 7R, 74mm bearing spacing?
  15. Ghost0

    Ghost0 Guest

    The wider crank is only wider on the left side so it would solve the problem with the left brace but will not improve your situation on the right. The cartridge version can be spaced for the 73 mm BB. My only other suggestion is find a different frame.
  16. Drunkskunk

    Drunkskunk Member

    How much wider on the left? Most of my clearance issue is on the left. the right could be solved with a smaller sprocket, some lift, or spacers on the freewheel.
    Last edited: Feb 28, 2010
  17. Ghost0

    Ghost0 Guest

    It is about 18mm wider on the left side or about 3/4 of an inch.
  18. Ghost0

    Ghost0 Guest

    We have some samples in of the offset spindles if you want to try one.
  19. arkives1

    arkives1 Member

    SPB Shift kit trouble

    I don't know if this will help you any but I saw a longer offset intake manifold somewhere, I think it may have been Spookytooths web site. Possibly the offset manifold and it being 7" long would move your carb to the side far enough to clear the frame. Perhaps another member will know where to find the manifold. Woody
  20. Drunkskunk

    Drunkskunk Member

    Yeah, that would be perfect!
    How would I go about ordering one?