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Yamaha xj900p 2008

This is a discussion on Yamaha xj900p 2008 within the Project Builds forums, part of the Caferacer.net Forums category; :| you really need to start working on what you have and not on what you wish you had. Buttress what you have without altering ...

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Thread: Yamaha xj900p 2008

  1. #51
    Senior Member TrialsRider's Avatar
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    :| you really need to start working on what you have and not on what you wish you had.
    Buttress what you have without altering the mounting points and dimensions in the least, the sub frame does nothing except give you somewhere to sit your ass and originally yours was also designed to carry a passenger. Beyond that it carries lights to make the thing street legal at night and a rear fender <- which believe it of not is a vital part of a motorcycle, if it wasn't there would not be fenders on a trials bike.

    + ... that crankcase breather pod filter is a total stupid idea. Don't copy yet another stupid idea.
    Learn what has to go in and out of that breather vent and put something on there that will work.



    I kind of figured out where you live by your user name,
    your roads suck just as bad as the roads here suck, we just have a lot more of them.
    Last edited by TrialsRider; 05-08-2019 at 06:17 AM.

  2. #52
    Senior Member TrialsRider's Avatar
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    Sidenote on replacing the rear shock, if your shock is working leave it. There are 4 critical aspects to a rear suspension coil-over shock: spring rate, compression dampening, rebound dampening and spring preload. "stiffer" is what somebody who doesn't know any better thinks is an upgrade, a true upgrade would provide you with adjustment over all of those aspects if your current shock and spring does not already accommodate those.
    ... plus your bike was designed to carry 2-up and you are making it into a solo bike, your spring rate is going to be plenty high enough unless you are a really heavy person.

  3. #53
    Senior Member TrialsRider's Avatar
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    Quote Originally Posted by kumailrashid View Post
    ... Can i remove it and put a support from the top of the shock mount to the top bar
    Don't cut more off and think triangulation. The triangle is a very strong shape and is repeated throughout your original frame. Replace triangle shaped supports with similarly triangle shaped supports and it won't fall to pieces like a stack of cards. The loads from your rear suspension, you and all the weight is headed for the steering head bearing and support. That is the most highly stressed part on the frame.

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  5. #54
    Junior Member kumailrashid's Avatar
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    If i move the top mount of the shock forward to the main frame there wont be a need of the existing sub frame which like u said was designed for carrying two, storage boxes and a whole load. by reducing the dog bone i can get the shock to raise n move forward( like using a raising kit) The shock is good n i dont want to replace it. Lol the pod filter on the crankcase came from the previous owner not my doing

  6. #55
    Junior Member kumailrashid's Avatar
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    Damn this has been a crazy up and down but i think i finally got it. The top mount of the shock sits in a U bar which the front is mounted to the Main Frame and the back to the Bottom bar of the Sub-Frame.

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    After a lot of thought and every ones in put i decide not to move the shock at all but to install a straight longer 55cm U bar at the same angle making my new sub frame

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    After this i mocked up the side plates and bottom plate and i think im happy let me know what you think

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  7. #56
    Member Oldjeep's Avatar
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    Not understanding - what are those lower cut off bars going to tie into? The bottom of the cardboard? If you just leave them hanging in space with no support from above then they will be touching that cardboard after you hit your first big bump.

  8. #57
    Senior Member brad black's Avatar
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    i think he's going to cut them off and put a vertical piece on top of the shock mount to the frame work above.

    as i understand it anyway.

  9. #58
    Junior Member kumailrashid's Avatar
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    I am going to totally remove the lower bar and and mount the shock in the new C channel i am going to install making my new lower bar. i am not using any of the extisting sub-frame. i am making a whole new subframe
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  10. #59
    Junior Member MotoTeknic's Avatar
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    i think thats a better idea, also search youtube people might have done some of the guess work for you.

  11. #60
    Junior Member kumailrashid's Avatar
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    Quick Update we have a new subframe

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    You can see now the C channel that is my new bottom and mount for the shock
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