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500-4 scrapheap challenge

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Nurse Julie:
Just measured CB500, ruler in same place is 5 inches. Slightly difficult to measure as this bike has front mudguard on.

Colonial-Clive (yindi):
Hi, from front bolt to tyre is 6", from no 2&3 pipes 5" so you should have enough room, or you could rake the neck a tad..  ;)

matthewmosse:
I like what you are doing, I have a cb125 twin engine and Ns125r frame that are a similar idea, the frame had previous really dodgy welding on the monoshock mounting, given it was known to be tuned to accelerate like a banshee and do 110mph there was no way I wanted to put it back to standard format, so I got a replacement frame and v5c and intend the ns125r to become a ns125f, no big deal, cheap learner machine, might be fun. The old ns125r frame will be strengthened and twin shocked and get superdream wheels that failed to get sold at 99p on eBay. The rest of the running gear will be stuff that came in job lots or was given by various mates clearing garage space. Kids and getting laid off have slowed progress on bikes to a virtual halt as starting up in  self employment and the stresses on a marriage that career rollercoasters and kids bring do not leave a lot of shed time, but one day the project will come back to the front, like you, I find it good to head out to the shed and solve the problems involved in a 'custom' project to clear my head, though there are a few such projects in my shed, mini dumpers made from industrial grass cutters also fill that role and look to potentially earn a few pennies, plus damn handy things for my handy man jobs, save a lot of pushing wheelbarrows. 
Looks like you are hopefully about there on clearance. Weight wise my first 550 came in a job lot with several cb250s, I remember the engines were close or weight and width when I loaded them in the van. Might make a fun bike. If the clearance is too tight a tad more rake to the frame with careful welding, slab yokes to kick things foreward or leading link forks might make it both more interesting and involving and more unique. Equally a smaller diameter wheel and longer forks might increase clearance. ( trail bike forks?.)

haynes66:
thank you all for your input. i put another spare set of forks on which have no springs in, so the thing sits at full travel and it looks like it might be ok. i will be looking out for a 400n front end as the forks are a tad thicker and has twin discs but that is down the line a bit yet. new engine mountings are next on the agenda and i'm still unsure about downtubes.  i was thinking i would need to run tubes under the engine but having seen a few racing 400s, the frame seems to be stable enough to use the engine as a stressed member. i'll need some professional advice on that one, i think.

Bryanj:
lots of bikes used the engine as a stressed member and it was not unknown to build a "Trifield" a 500 triumph twin in an enfield 250 frame using dural plates

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