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  1. J

    Sbp shift kit changing gears

    For higher speed you would need a smaller left side jackshaft gear - but they only have stock(17T) or a larger(23T) one available. You could replace the 36T drive chainwheel with a 40T chainwheel or alternately use the 40T in place of the 44T driven chainwheel - either way it will give you...
  2. J

    Sbp shift kit changing gears

    the 11T will give you 10% higher gearing, but if you change the cassette as well and first gear is bigger, your hill climbing ability should be the same - e.g. say if 1st changed from 30T to 33T, then it would be 10% bigger and combined with the 10% bigger 11T jackshaft gear, first gear would...
  3. J

    Sbp shift kit changing gears

    It is pretty difficult to set up with a front derailleur, it is possible but always involves compromises that I don't like such as mounting the engine higher, having the pedals wider apart, etc... You could just simply swap the chain wheels (put the 36T on the outside and the 44T on the inside)...
  4. J

    Sick Bike Parts Shift Kit - is it worth the cost?

    I also thoroughly recommend the SBP's shift kit - makes for a much more usable bike, though learning to start the engine and change the gears without jerking the freewheel or the chains is something that takes practise. I have 6 sbp shift kits and I am about to order 2 more. I have tried the...
  5. J

    Pedal crank alignment

    Okay - it's fixed! So I pulled out several more crankshafts from my spare bike collection and found one that's the same on the short side, but several mm's shorter on the long side- strangely it was installed with the short side on the chain side?? I pulled apart the cranks and installed this...
  6. J

    Pedal crank alignment

    Well I just measured the difference and it's actually closer to a quarter of an inch, and the inner chain wheel is very close indeed to the conversion kit part on that side... so I really should just ignore it! I would really love to know why this happened though... hmmmmmmm!
  7. J

    Pedal crank alignment

    This is my other bike with the crank conversion that I am trying to replicate. Yes, I know the chains are swapped - I like to do this so the derailleur chain is easy peasy to remove, the stock crank width can be retained and some other reasons too. I use 11 loose ball bearings of the correct...
  8. J

    Pedal crank alignment

    I am currently making a motorized Northern Star ATB with a jackshaft shift kit. It had a one piece crank which I am converting to a three piece unit. What has me totally baffled is that the crank on the chain wheel side is half an inch further out than the other crank???? The crankshaft is...
  9. J

    Can't find rear axles or 6v dynamo bulbs

    Working on my #7 build and can't find a .5 watt 6 volt screw in bulb for my dynamo hub powered tail light anywhere (except on ebay where they want $25 shipping!). Any one know of an online source for these? Also only one of my builds has a suitable rear axle that doesn't end up bent! (it's...
  10. J

    Dual brake lever!

    The listing was not for the setup pictured, it was for a dual brake cable that hooks up to a standard lever and then splits into two - they are available cheaper from bikeberry, but I plan to make my own dual brake lever now using the picture as a guide for how it's done.
  11. J

    Dual brake lever!

    Found this image on ebay - ha ha, brilliant! -now I can see how to make my own dual brake lever and will never need to buy a dual brake cable. :)
  12. J

    Motorized Bicycle Take a Tip...Leave a Tip

    My latest engine came with the clutch arm incorrectly orientated on the spline - once I managed to get it off it was easy to reorientate it slightly inwards of pointing directly straight back (with the cable back on and the slack adjusted out). The way it was (pointing out diagonally between...
  13. J

    carb needles!

    so there are differences in the brass tubes(needle jets) that will affect how she runs too?!! (I have been leaving the brass tube and main jet together as its easier to work with when the carbs not removed from the bike)
  14. J

    carb needles!

    the needle jet is the main jet? i assume these simple carbs don't have emulsion tubes(needle jets) like my old honda4's. I have only three types of jets - and they are indeed quite different - the #66 hex type(speed carb), the #70 round(standard carb) and larger round SBP's in various sizes. My...
  15. J

    carb needles!

    I have been struggling to get one of my china girls to run nice. It has upgraded ignition from SBP's and a speed carb with a HD sports air filter (like all my bikes) - after trying 3 different jet sizes + all five needle clip positions for most of the 3 jets, today I left the #68 jet in but...
  16. J

    Chain size chart

    I can't see tilting the engine helping at all. You have found the same frustrating chain/sprocket compatibility issue that I have struggled with big time! Ideally, if you buy an engine sprocket with more pointy teeth, it could solve your issue but you wouldn't know for sure until it arrived - a...
  17. J

    Chain size chart

    I have 420 chain on most of my 6 m/b's- the rollers have a tendancy to shatter (twice I've had 420 rollers fail!) and they look crappy and have alot of side to side play. I like the look of the 415 chain a lot more because the plates are thicker and the rollers are nice symmetrical cylinders...
  18. J

    gear shifter for clutch lever

    The falcon shifter (with the detent spring removed) that I used already had enough travel - I just found some single stand copper wire and crimped a little bit around the gear cable with pliers and then soldered it on. (Then had to cut a plastic cable end ferrule in halve lenghwise and feed the...
  19. J

    gear shifter for clutch lever

    I think thumb shifters are a viable option - I just pop in the clutch ahead of time when I can see I might have to stop (like when approaching a give way sign). I plan to eventually buy for all my bikes -that I haven't already- a dual brake lever and matching clutch lever to make them safe for...
  20. J

    gear shifter for clutch lever

    This bike has left side mounted twist grip rear derailleur gear shifting with the original left side front derailleur friction shifter hooked up to the clutch release arm (I removed and discarded the front derailleur when I fitted the shift kit). In the picture the clutch is pulled in, to...