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CB650 "Parts Bin Special"

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andy120t:
Last weekend it was finally warm for a while (unlike today!) so I headed to the shed & finally I got the engine back together - if you go back to the beginning of the thread you'll see that the rusted barrels were the a problem, now I have nice shiny ones in place.

I also put enought wiring in to prove the ignition worked - and found that I have sparks across two cylinders only. Need to fault find this weekend - but it seems to be either one side of the pick-ups or the connections feeding power to that side (I think). Coils are fine and swapping connections around indicated that both CDI's were OK.  ..But it was getting cold by then so I need to recheck everything again.

Piccies to follow when I get a minute, but the end seems to be in sight (at least in terms of having a runner - cosmetics will follow that). Once she's sparking I'll feel confident to source (ie spend money on...) some carbs (the ones I have don't fit - prbably going to go with GPz600 ones having read some threads on these on the US forum) and consumables - tyres, chain, sprockets, exhaust gaskets, brake pads. Then just need to wire in the horn and brake lights and it'll be MOT time!

Other minor parts I'm short of are the lower rear engine mounting bolt, points cover and the rubber grommets that hold the sidepanels in place - so if anyone has any spares of these please let me know.

andy120t:
Last weekend it was still cold but everything sparked! So both sides of the pick-ups are working. Both CDI's, and the one coil & spark plug I've tested. Result!  I must just have been too cold to test properly the previous weekend.

I'm away this weekend so hope to have time to track down some carbs. I also need to test & wire in the starter relay & motor, but once those are all done here I'll just pop the carbs on and hopefully she'll fire up first time!

During the week I alo created a bespoke "parts-bin-special  manual" using the appropriate parts pages from various online sources, namely:
Cb550 frame & forks & swing-arm
CB400 wheels
Cb650 engine
FZR100 starter relay
GPZ400r front brakes
GPZ600r carbs

Quite please with it really! A very entertaining 'read' on the train home.

andy120t:
... I need to post some piccies; but as an interim - 'bike is now out of the cellar and I spent the bank holiday weekend putting the engine in. I tried frame over engine but with the wheels attached & long handlebars this wasn't really working, so I then lifted it in & that worked a treat. Surprisingly easy for one person althought I had to remove the rocker covers. GPZ600 brakes are on but not really working - master cylinder is from a trail bike & may be a little small for the job so I plan to swop this out & put in the standard one to check that it all works properly & to get through an MOT.

GPZ600 carbs slotted straight on and by the end of the long weekend all 4 cylinders were firing. - I had to piggyback fuel from my Triumph using a long fuel pipe so had a few concerns about the 650 going up in flames and taking my Triumph out too - however in the end it all went smoothly. Only problem is that it's not running fully on it's own, just firing,  so the plan is now to clean the plugs, juggle the choke a bit more and try again. Also, I'm currently trying to run it without exhausts so I'm not sure if putting those on would help it run.

I also wired in the brake lights & horn so I have the MOT minimum in place for electrics.

Aside from that - I need tyres; chain & sprockets; two disc bolts and a few odd nuts & bolts and a number plate. Cosmetically, it's a little untidy but I want it running and MOT'd and then I'll move on to how it looks.

One final concern is that now it's all together the chain may not line up with the 400 sprocket/wheel hub, so I need to assess that this weekend & see if it needs solving - either with spacers behind the sprocket or alternatively I may go the need a 550 wheel route. Don't want to buy tyres until I've made that decisions.

andy120t:
Managed to get quite a bit done over the last few weekend.
GPz carbs on . Original loom on the bike and plugged in. It seemed to be firing but it wasn

K2-K6:
That's come a long way andy120t, and much work to get it there.

Be interesting to see how it runs on the gpz carbs, I guess they should easily flow enough to let it make good power.

Thanks for taking the time to post for us to see as it's interesting to see something different come together, looks quite flat-trackish.

Don't know if you are aware that if you want copper washers to seal well it's best to soften them first by heating to red hot and dropping into cold water. this should give you the best chance of working with the threads you have left.

let us know how the mot pans out and also what it's like to ride.

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