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Discussion in 'Other Projects - Other Bikes (non 250's)' started by Gen, May 6, 2021.
What the heck is a bizzo?
Anything that works, usually, it's a vision, nameless, formless & relies on taking a dump (where the best thoughts happen), but sometimes, bizzo plans can be created in the fart sack, in the moments just before falling asleep.
This one might include a pair of Honda NT650V (or similar ) final drive bevel gears, a few thrust (tapered roller) bearings and a sprinkling of 5083 10mm alooominium plate & might live in the spot CBR250 front sprockets would normally live.
If you replaced some of the wood with steel, I bet it steel wooden handle.
Come in spinnah
@Gen - I noticed that you replaced some bearing shells
Do you have any, both big and and mains [not installed obviously] that you could measure the shell width
Did you manage to source MC19 shells locally or did you have get them from OS?
Main bearing shells 13.84 mm width (vernier measurement), I don't have any big end shells that I can measure,,
Shells come up occasionally in Oz (I have a permanent ebay search which notifies me is they come up for sale)
CMSLN usually stock them in Europe, as does wisicarcom in the UK, wemoto also, Omah at EXite may have some ?
Awesome thank you - you're one of the few magical motorcyclists that measures stuff
If only I had better eyes , back & a fountain of youth
Hey it's really appreciated - I've asked so many questions on other forums for simple measurements that go unanswered or get silly answers
If I can beg one further favour - a straight [down] on shot so that I can compare the groove width a yours are 1mm less wide than the FZR250 bearing shells, but that groove looks to be thinner
It's blowing dust today Mate, when it clears, I'll open the shed & uncover the engine and find a few, line 'em up, and if you like, mic 'em, possibly tomorrow ?
Just a photo of one with a ruler beside it would be most excellent - that width measurement is well past accurate enough
The CBR250 service manual is the equal best I've read because it gives crankshaft measurement ranges, engine case bore measurement ranges and most importantly bearing shell material thickness ranges
Whereas Yamaha only gives colours - which is leaving us guessing and trying to measure minute 4-5 micron tolerances - but I'll get there...eventually
Perfect - thank you
width will fit in FZR250 cases - tab location is similar if not identical, looks to be of similar width and the actual oil contact bearing face is close
As it turns out, I researched the bearings that I have here as it isn't marked with paint, but does have a number stamped on it D2F A
One hit that I got on google was a reference to CB350/CB400 bearing shells - so same OEM supplier for my FZR250 bearing as the Honda CB350 bearing
Someone got up before the spoggies again today,,,
Good stuff Gen. But what is the problem you are trying to solve? I might have missed an earlier post. Have the case halves moved a bit with the welding process?
Keep up the good work.
I am really looking forward to hearing this beauty run.
That thing is begging for fuel injection, simple intake runners to a central plenum and single throttle body. But carbs are cool
One of the journals had a gouge/highspot in it
I was worried about crankcase distortion due to welding heat also, but lucky for me, I have a boilermaker mate, who actually thinks,,,he worked around the cases bit by bit, to minimize any distortion, the only problem was that the cases from 2 engines were married, they moved .007" closer together (between crank centers)
Be very careful buying **** from a wrecker, a previous owner / abuser seemed to enjoy dropping heavy parts onto machined surfaces, and,,,,doing bolts up until the threads stripped
I hear you. I've looked over a few FZR250 engines in the process of making my project and it's horrifying what has been done here and there. Especially considering what little jewels these engines are. Of course they are practically worthless now so not many people are willing to spend time or money on them, except us loonies.