SOHC.co.uk Forums > CB650
CB650 "Parts Bin Special"
matthewmosse:
Looking good, and an interesting thread, right up my street, keeping to a budget and making a good workable machine from odds and sods. Great result though a bit shiny (I prefer rust on my bikes) does look like it will be very sweet when finished.
andy120t:
Thanks for the comments!
..no MOT yesterday..exhaust isn't yet silenced / sealed - bought a silencer but now need to find a collar to fit it with as the diameter is a couple of mm more than my header pipe.
Sealed the engine - tried anealing the copper washer in the oven but couldn't get the temp. high enough...they have to get to 6/700 degrees to turn red. Anyway, I hand-filed a bolt to the exact length of the hole in then engine and that gave me enough grip to seal using the existing washer. Very pleased that there'll be no helicoiling for now.
Drilled & fitted the numberplate & stuck a reflector on. Plate is legal, back-end of th ebike is skinny with a very skinny tyre so it all looks faintly ridiculous. Will need to source a smaller version for other occasions.
Chain & sprockets on & aligned using the spacers I had in place already so pleased with that.
Two final probs. Fuel tap seems to be missing a brass pipe (where the fuel line mounts). It has a single one and a thredaded hole for a second. Petrol is coming out of both which is a bit of a pain. Any ideas where I can source a spare for this?..Anyone have a spare one lying around?
Engine won't run fully. I still had the plug leads on the wrong cylinders so after a few huge backfires I reviewed the wiring diagram and finally got this right. Now it runs on full choke only but dies the moment I touch th throttle..not sure if this is a grubby carb problem or related to me using CV/diapraghm carbs rather than mechanical ones...Will do some online research on this, but any thoughts on this please let me know.
.....So, no MOT yet!
K2-K6:
The carbs should be able to run that motor, some are even using bike CV carbs on car engines for example so they should be able to be configured to get it going. and I'd guess at the original demands being not that far off what you need to at least get some half sensible response from it.
Assume they are all in good order i.e. clean clear and minty with good diaphram sealing?
Fuel pipe, can you use anythng from a car spares shop as they sometimes have copper of varying sizes available.
andy120t:
My worry was that there might be a need to have a vacuum pipe linked to the fuel tank. However, the carbs are filling with fuel and as I understand it the vacuum element of the carb. is primarily related to raising / lowering the needle; rather than drawing fuel down.
So, with the 'bike running the carbs should work. Since they aren't, I'm assuming that the jets may be blocked so need to give them a good flush through with carb cleaner as a first step.
K2-K6:
Usually the vacuum pipe to the fuel tank is only to turn the fuel supply on and off by using a small diaphram operated valve inside the tap.
If the tap hasn't got this then it should just be gravity flow when it's switched on.
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