just finished almost nirve switchblade (my version)

Discussion in 'Photos & Bicycle Builds' started by foyeburger, Jan 15, 2007.

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  1. foyeburger

    foyeburger Guest

    took for second test ride so far so good went with the smaller rear tire but have since read blazes post so may go with fatter tire later ( had to get in the wind since ratfink bike broke apart still working on that to went with a gas tank instead of trying to use the top tube for a tank it just doesnt look like it would hold a lot of gas besides i like these little tanks anyway to late for the bike of the month maybe next month haha! on my trip to starbucks the sheriff pulls up they go in get a cup of coffee come back out stare at my bike for like 30 seconds turns to me and says tricked out bike dude and off they went cool any way enjoy the photos i only have a phone camera so pics could be better so far my only issue is the vibration in the pedals starts at about 21 or22 mph and makes me back off will work on (tinglefoot) other than that went with the engine that was in the rat fink so i didnt have to brake in a new engine larry ca[​IMG]

  2. srdavo

    srdavo Active Member

    Nov 4, 2006
    Likes Received:
    :D I LIKE IT! :D
  3. psuggmog

    psuggmog Guest

    That chrome tank looks good with your shiny forks.
  4. gone_fishin

    gone_fishin Guest

    that mount is kick*SS! you layed that engine right where it's 'sposed to be...good eye 'burger 8)

    i'm with psuggmog..nice chrome-y look, love the triple-tree :)

    anyone remember how the old car front-ends had one speed they would shake themselves to pieces on, but if ya goosed it they would smooth out again?

    me, i'm betting it's the long tube-mount...

    was wondering, what happens if ya throttle past the "resonance"?
  5. foyeburger

    foyeburger Guest

    dont know but ill take my feet off on a no car road and find out some back road somewhere and check it out right now i just took the bolt out of the motormount and am using only the muffler clamps to see if it will slow down the vibe a bit ill get back to ya larry ca
  6. tirebiter

    tirebiter Guest

    I really like the look you've got going there. You've done good :grin:

    I've got to agree with augidog tho. I think that tall mount is where your vibrations are coming from. There's just nothing to stabilize the vibrations out on the end of that tube. It looks like you've got plenty of room to mount the engine low. It might not look as good but I'll bet it would reduce your vibrations. A bigger base on the mount would help too with clamps both behind and in front of the tube. It might be worth a try to drop the engine as low as you can if all other things don't help.

    Or you could try adding to the mount you've got and double clamping both ends. Here's a crude drawing with red being the added material.

    Just throwing out ideas. :)

  7. nogoodnic42

    nogoodnic42 Guest

    Great job and a great looking bike, I'll be using as a reffrence when I do mine. I also agree with Augi, I have one bike that will shake the crap out of you at 25mph but if I open it up a little more she'll run smooth...Kelly
  8. foyeburger

    foyeburger Guest

    good ideas guys im also leaning to the mount i made the differnce in the one that was on the rat fink was it had a back part to it . this one is strange no vibration anywere not at the tank not on the seat post it rather rides quite smooth till 21 mph and the only thing that vibes is the foot pedals . i may remake the motor mount to have a backing to it to try and pull the vibe back towards the seat post me thinks ill be messing with it in a while have to go back to work next free day larry ca
  9. jaker

    jaker Guest

    anti vibration means one thing to me ... insulate direct metal to metal contact with rubber innertubes ect should help to reduce vibration.
  10. Blaze

    Blaze Guest

    About time somebody motorized another Nirve Switchblade chopper! I always thought these were the coolest bikes to put a motor on.

    I agree with Jaker on the vibration thing. Mine is mounted super low, and it's a solid mounting directly to the seat tube and the bottom tube. Vibration is exactly the same as yours. Try going 30 hahahahha! The vibration is crazy! I'm sure most of it is just the natural resonant frequency of the bike being close to the engine rpms. The best way probably really would be the inner tube idea. I just never bothered with it. I usually cruise around just under 20mph anyway, but I guess I really should just stick some inner tube in there already. I bet it would be so much smoother.

    Keep the photos coming. That bike looks bitchin! The chrome tank is sweet.
  11. foyeburger

    foyeburger Guest

    hey blaze good to hear your imput. so yours vibrates about the same huh thats good to hear so wether the engine is higher or lower doesnt seem to matter much so ill go with the metal on metal and pull the motor mount and put some innertube stuff under the mount and maybe on the motor mounts on the post and seat post see if that calms it down abit im good till about n21 22 mph regular cruzing speed but once and a while i get this iching to stomp on it when im in a safe road to do so my rat fink bike was funney it vibrated about 17 18 mph but once you got past that it was smooth sailing . same kinda motor mount i used almost but itworked till she vibrated apart on the top tube but this nirve looks alot more solid top tube anyway im calling them california choppers( the look ) these are one enginering feat to build one of these yours more cause of the sprocket and using a fattyo tire was a major accomplishment larry ca
  12. Steve

    Steve Guest

    About the rubber

    Guys, don't know if you want to hear this or not, but I put rubber between my engine and the frame, both front and rear, and it still vibrates BAD. I had ground out the curves on the mounts to install the engine on a chopper bike, gave up on it because of all the problems, so then had to fill the extra space when I installed it in the new frame. The front rubber on mine is inner tube thickness, and the rear is about 1/4" thick...a piece of puckup truck bed liner. I'm thinking the engine is just inadequately ballanced.
  13. Blaze

    Blaze Guest

    Yeah, I want to hear it. It means I don't have to pull my motor off and redo the mounts. If it isn't going to make a big difference, I'm not going to bother with it.

    Burger- I posted an article in the how-to section showing the new ugly-but-tough coaster brake arm I designed. The article is basically how to use a fatty tire. The hardest part is making the brake arm unless you know somebody who can weld. I always have to get it done at a local garage by a guy who doesn't mind working on this kind of stuff. I would get some 12 gauge spokes on order eventually. Mine would last about six months of moderate riding, then the ends at the hub would pop off. The second time I had to replace them, I used 12 gauge spokes. I had to have my spokes special made because of the odd length.
  14. foyeburger

    foyeburger Guest

    my version of nivre swichblade

  15. foyeburger

    foyeburger Guest

    finally.. got around to working on the motor mount and put a rod from the main pole up to the down tube il post a pick as soon as i can . but the good news is th pedal vibration is totally gone so i can crank it up past 21 miles and hour . yeah!!!!!!!! 1,285 miles on it so far...
  16. foyeburger

    foyeburger Guest

    big thank you to tirebiter for making that photo suggestion it worked like a charm thanks tirebiter.
  17. foyeburger

    foyeburger Guest

    used a piece of handle bar to make the brace and some muffler clamps works real gooooood!!!!

    Attached Files:

  18. MichaelSteve

    MichaelSteve Guest

    Awesome dude!
    A definate pimp machine!
  19. lhemrick

    lhemrick Guest

    I like it! and I agree with everyone else got to get both ends of that engine tired to the bile firmly. I always check the clamps on mine to make sure it stays tight.
  20. foyeburger

    foyeburger Guest

    finnally took my switchblade apart and had the motor mount bar welded to the frame and then dismatiled it and sent it to the powdercoater just got it back and will begin putting it back together soon just waiting on some parts to arrive happy trails larry ca

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