front freewheel crankbearing needs constant adjustment

Discussion in 'Frame Mounted Engines' started by craisin, Nov 27, 2009.

  1. craisin

    craisin Member

    So Ive put the freewheel and extended crank and shaped pedal shafts on.
    Then I wanted to ride with no motor on to a friends place to modify my brakes.
    The first time I attempted the 5 mile pedal I had a blow out in the back tire.
    So I push the bike home and fix the tire.
    I notice the crank needs adjusting so soon
    The next time I attempt the trip a couple of miles into the trip the crank bearings have gone all floppy again
    So anyone else had problems.
    Does it get worse with the power of the engine???
     

  2. Ghost0

    Ghost0 Guest

    Are you sure you installed them correctly? They are left and right hand threads. If you put them on backwards they will continually loosen up from pedaling. What kind of bottom bracket? Cartridge, cup and cone, one piece?
     
  3. craisin

    craisin Member

    No its not the pedals Ghost
    I bought a shifter kit with my chinese 2 stroke and there was longer shaft with square tapers to replace the shorter original shaft

    It runs on caged balls and its those that need the adjustment
     
  4. Ghost0

    Ghost0 Guest

    I know, that is what I am talking about. My guess is that you have installed the cups on the wrong side. Swap them so that as you pedal it will be tightening them up instead of loosening them.
     
  5. craisin

    craisin Member

    sorry Ghost youve lost me
    So I pulled the shaft out and on the side furtherest from the chainwheel the cage had broken up so Ive cleaned out all the shrapnel and put new bearings in

    I put a different cone in the side that broke up

    I am 60 years old and I started playing around with bikes from 10 years old

    Bike havent changed much and I cant see how anybody could do what you guessed I did Mr Ghost :jester:what you been smoking boy
     
  6. Ghost0

    Ghost0 Guest

    Most importantly you found the problem. There are conversion kits out there that allow you to swap the left and right hand threads on the bottom bracket so that is why I asked what kind of BB you had. As you know most 3 piece bottom brackets have threads in the bottom bracket tube which would make it impossible to swap the left and right. But the conversion adapters can be put in to the tube either way which could cause someone to install the cups backwards.
     
  7. craisin

    craisin Member

    yeah right Ghost I see
    Do your conversions space the bearing out?
    I bought my engine and shift kit from Motrax a local New Zealand engine supplier.
    Sometimes a mate would say I have what yourve been smokin I would say Im high on life
    Anyway I started with a mountain bike but thanks to this forum I noticed broken frames and the mtb frame was overspec for mounts
    So Im using a bike with 28 inch wheels well ive put a 26 inch wheel on the back Ive cut the outside knobs off the outside of the rear tire with a serated knife:idea:corners better than my mtb for sure
    I think I may have to shorten my peddle shafts or stop peddling over this big tree root down the back
     
  8. craisin

    craisin Member

    well Ghost I see from SBs website what you mean
    We have 2 mtbs that have those plastic jobs that need that tool to remove them a Scott and a made in USA Raleigh which is mostly alloy frame

    Anyway cant save every old bike
     
  9. Pablo

    Pablo Motored Bikes Sponsor

    I'm sorry to say that is not a Sick Bike Parts kit, SBP has no connection or association with Motrax. Can't say what that guy uses for parts, but he is not using anything from Sick Bike Parts that we know of. We will try our best to help you out, no problem, just wondering if he sent you to our site for help, did he claim it to be a Sick Bike Parts Shifter Kit, etc? Not trying to put the load on you or anything, again we are here to help. Indeed photos would be great. Thanks.
     
    Last edited: Nov 28, 2009
  10. Ghost0

    Ghost0 Guest

    Our conversion kits do not widen the bearing spacing. However what some don't know is that the bottom bracket bearing spacing on steel frames is 68 mm and it is 73 mm on most aluminum frames. This may be part of the problem. We sell a spindle made for aluminum frames with the 73 mm bearing spacing.

    As Pablo pointed out you are the first member here to my knowledge that has the Motrax knock off of our kit. Would love see photo of your install.
     
  11. craisin

    craisin Member

    Well you sick guys take it easy on me :jester: A mate and I were this guy on you tube Graig?? pimping out his Chris Hill motored sick shift kitted mtb
    And my mate said I want one
    So I found Motrax and my friend actually bought the motor and kit for me and one for himself.
    I got shouted cause my friend want me to do the research
    Anyway the instructions were sketchy and you couldnt call the whole deal sound engineering or precise.
    Anyway I dont really need your guys advice to get this going
    And sorry for you guys if you think anybody from Motrax told me to get on your case about Quality of their product.:jester:
    The guy from Motrax made it sound like it was a multiple choice assembly procedure and if I develop a better proceedure he is keen to see.
    My friend used their proceedure which has the chain from the Jackshaft on the inside chain wheel. = makes the lower gears impossible to engage,
    So to be precise you guys have links to your Website in your posts in my Thread .
    PM me as I am not sure of what your implying.
    I may be leaving this forum soon and Ive lost the keeness to post pics
    Get well soon:whistling:
     
  12. craisin

    craisin Member

    Sorry for the confusion Guys
    I do have Photos on my phone but at present dont have a bluetooth or infared device to put them on my PC
     
  13. craisin

    craisin Member

    :rolleyes7:well I just sit the motor in the frame and check pedal clearances and theres heaps:idea:
    So put the next size down in length shaft that i have still heaps of clearance.
    So i roll the shaft that came with my kit on a flat surface:whistling:not very straight
     
  14. craisin

    craisin Member

    so the next shorter shaft is in there now and I checked clearance on the motor theres still heaps
    there is one shorter shaft but the bearing spacing too narrow for my liking
    Sweet
     
  15. craisin

    craisin Member

    finally got a memory for my cam phone bought a data cable that didnt work
    kiwi bikes
     

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