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CB650 "Parts Bin Special"
andy120t:
I think I always knew that the solution to 'not starting' would be a carb strip and rebuild...I was just trying to avoid it!
I've had all the jets out and soaking in carb cleaner which loosened up most of the gunge. Amazing how rock hard and 100% blocked they all were - especially the pilot jets. Anyway, all cleaned up now- I've always understood it's a bad idea to clean the jets with wire, however the petrol in the pilot jets was rock hard...a bit of surfing told me that the wires on a wire brush would be narrorer than the narrowet pilot jet drilling/diameters - (from memory .16mm for the wire bristles vs .32mm for the tiniest pilot jet drillings....so I gently tried it out & found that the wire bristles easily fitted and helped me prod clean the gunge. By contrast, a safety pin and a needle (both of which look pretty narrow to the naked eye) were far too fat and would definitely have enlarged the holes.
Rsult of all this is that she fired up straightaway, without any choke - so a good result.
Still not MOT'd though - primarily because my fork seals (brand new and on pretty decent chrome stanchions) have leaked a river of fluid whilst standing in the shed. Given that the bike has barely moved since I put these in I can't understand why. A look at the parts diagram indicates that there may be a need for a washer between the seal and the seal circlip. I've not come across this before so am wondering if this will press it more tightly against the forks (?) However, I can't think that this would be the case so I'm currently baffled.
mick:
Hi Andy sounds like your making progress, i have used the wire out of sandwich bag ties as its very thin to clear pilot jets, don't know about the fork seals?,good luck with the rest of it ;), cheers Mick.
andy120t:
I'm considering the possibility that I've put the seals in upside down...never done this before but I was so intrigued by the amount of tissue paper stuffed in between the seal and the seal cover that I may have been distracted.....
Clearly someone couldn't stretch to the price of a new pair of seals at some stage!
Hopefuly get time to check this weekend.
andy120t:
Well - Christmas, cold and various other excitements have got in they way - but I'm finally progressing again.
- First time round it was raining and miserable and having put in new seals, they proceeded to leak.
- Second time it started sunny then, as I was stripping the forks in the garden (again) it promptly turned cold and rainy and I got soaked. Re-fitted the seals, this time one seal leaked.
- Third time, I stripped and rebuilt the leaky one in the cellar and....finally....it has sealed. Clearly the fact that I had laid in some Bandit 600 yokes to fit my 'spare' GSXR forks meant the old fork/seal combo new they were headed for the tip if they didn't work this time. (Alternatively, warm cellar and no rain trickling down my neck might have enabled me to fir them square rather than slightly wonky...never done that before though!)
Which just leaves - slightly spongy brakes and a slightly stripped fork bottom (which houses the end of the axle rather than having a nut) as potential problems before I'm properly on the road this year! Nearly there.
Tomb:
Just enjoying reading through your build thread again Andy, couldn't help notice your frame.
It looks more like a K frame to me, I ain't an expert so forgive me if I'm wrong. The way I identify them is that the F frames' rear footrest loop is kinda like an equilateral triangle, whereas the K frames' loop is more longer and flatter triangle, if you know what I'm trying to say.
--- Quote from: andy120t on September 23, 2009, 12:08:16 PM ---Frame
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