SOHC.co.uk Forums > CB350/400

Is it a FRAME UP

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rigwit:
Well, you all know from my first pics of stripping the bike there was a bit of the, "Hole" demon in mudguard/seat bracket well steamed off the frame and cut the infill panel  started to clean pipework welds for migging in panel and lo and behold what did i see.well the left suspension mount/gusset is completely gone  got frame back home n decided to investigate with the old dremmel.  the insides of the main frame tubes has completely been eaten away so need to be replaced. works  mig is uselass  .my semi pro home jobby is better,but have lost regulator n pipework in move. now as I'm very cynical on a job i would give out  to do and not see what was done because of the new gusset....I'm seriously thinking on buying a portapack outfit and setting up a yearly account with BOC  and doing it myself. then I'd know the job was done correctly  and properly  also there would be lots of panels and brackets new gussets  etc  to attach to frame - so would be used a lot. then I'm thinking if Ive got a gas torch why not make the swingarm myself with the machining done by my friendly firm, ( a bit more about them later) so then I'm thinking  get a level stand, i mean a true level stand  be like looking at an oblong table  with box section around it and angle welded inside  a true piece of marine ply put in with the centre cut out oblong so a 400-4 sump would go in but the main crankcases would be supported, buy some T54 tubing and make a new frame for it like the old ducati ladder frame.. this would involve  new tank made etc etc  but I'm toying with it only thing i haven't got  is the facilities i used to have  as Ive made frames at work for others but thats going back to late 70,s early 80,s   no pipe bender no lath no milling machine no facing machine  so all that would have to be done -out of -house so to speak  or get some boiler plate and make side jigs and heat form tubesmyself...  well thats the bad news  about my friendly machine shop. took some parts in to be machined up and some brass or sintered bronze top hat bushes turned up, and heat pressed in to worn clutch shaft operating cup  then reamed out once heat pressed in and an alloy  kickstart plug made and threaded into clutch cover caseing.  also picked up a 99% full motor to use as a mock up while all my cases go for checking/peening/blasted/primed then satin blacked,  so decisions decisions i need a fatter wallet  methinks  :)

matthewmosse:
Sounds like quite a job you have to sort that frame, I know of a company local(ish) to me who build really nice frames for classic bikes, I know they do cb500 ones and even cb250 ones, pretty sure they even had a honda 250cc 4 cylinder? thing a year or so back. I belive their customers race their bikes so if you decide to opt for a one off frame without the hassle of building one, might be of interest. On my 500, I had to re make a portion of the rear frame and repair a few bits, wouldn't by itself be cost effective as boc accounts so expensive but it's also useful on the farm

rigwit:

--- Quote from: matthewmosse on July 13, 2010, 08:20:02 PM ---Sounds like quite a job you have to sort that frame, I know of a company local(ish) to me who build really nice frames for classic bikes, I know they do cb500 ones and even cb250 ones, pretty sure they even had a honda 250cc 4 cylinder? thing a year or so back. I belive their customers race their bikes so if you decide to opt for a one off frame without the hassle of building one, might be of interest. On my 500, I had to re make a portion of the rear frame and repair a few bits, wouldn't by itself be cost effective as boc accounts so expensive but it's also useful on the farm

--- End quote ---
  would it be jwmotorcycles..?

matthewmosse:
you already know them then?

rigwit:
Seen there site from a search bit aways from not so sunny yorkshire. so  dumbhead  here forgot about, Sponden in derbys  lot nearer  so gonna give em a ring and see what can be done............

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