Very nice work
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CruzinImage BS38 carburetor floats -- Review
- Thread starter TwoManyXS1Bs
- Start date
Check the modified float's new weight. It's just barely more than the sum of the individual parts.
Check for straightness with the 0.100" rod in the pivot hole.
Much better.
Measure the new inner and outer dimensions. Here, along with the previous float measurements.
Some vendors call these new floats "65mm", which may help to know what you're getting. The floatbowl width is just over 67mm. Not much room for float movement. Add to that the odd tilt/twist and non-symetrical assembly, and you can see a risk of float contact on the bowl sides.
This modified float has the float elements centered in their own portion of the float chamber, maximizing their side clearances.
Check for straightness with the 0.100" rod in the pivot hole.
Much better.
Measure the new inner and outer dimensions. Here, along with the previous float measurements.
Some vendors call these new floats "65mm", which may help to know what you're getting. The floatbowl width is just over 67mm. Not much room for float movement. Add to that the odd tilt/twist and non-symetrical assembly, and you can see a risk of float contact on the bowl sides.
This modified float has the float elements centered in their own portion of the float chamber, maximizing their side clearances.
A before and after pic. Without close inspection and measurements, they're almost indistinguishable. Can you tell which is which?
Myself, I wouldn't run one of those floats, and would have no reservations about running the other...
Myself, I wouldn't run one of those floats, and would have no reservations about running the other...
That was really great to watch you rebuild those floats 2M! That fixture you created is so nice it seems a shame to only use it once!
Maybe a little cottage industry.
Maybe a little cottage industry.
Haha, comin' at you, from the land of poo.
Dunno. Has there ever been a successful business that takes defective, overpriced counterfeits and knock-offs, and produces usable stuff?
Dunno. Has there ever been a successful business that takes defective, overpriced counterfeits and knock-offs, and produces usable stuff?
Messed it up that bad, eh? j/k
Could you tell if it's possible for the original to ever hit the side of the bowl? The clearance is so small that it makes me wonder if it isn't depending on that to limit movement to keep the needle aligned in the seat.
I've dealt with a few float problems long ago, caused by float drag on float bowl sides. Never a good thing. Defective float, or ham-handed amateurs, dunno. Replaced floats with factory new, fixed.
ALL float movement MUST be confined by the float hinge only...
ALL float movement MUST be confined by the float hinge only...
Nice work 2M - as usual.
Pete
Pete
Floatation test.
This is the tricky and messy part.
Place a drillbit in the float's hinge, set the float in a pan, drillbit supported.
Add fuel until the float just starts to rise.
Measure the exposed float body above the fuel line.
I'm getting 11mm of exposed float.
For comparison, here's a pic, taken a couple of years ago, of my OEM float, showing 13mm of exposed float.
The new, narrower CrusinImage floats set about 2mm lower in the fuel. To compensate, the original 25mm float height setting will need to be changed upward 2mm, to a 27mm float height setting, as a starting point...
This is the tricky and messy part.
Place a drillbit in the float's hinge, set the float in a pan, drillbit supported.
Add fuel until the float just starts to rise.
Measure the exposed float body above the fuel line.
I'm getting 11mm of exposed float.
For comparison, here's a pic, taken a couple of years ago, of my OEM float, showing 13mm of exposed float.
The new, narrower CrusinImage floats set about 2mm lower in the fuel. To compensate, the original 25mm float height setting will need to be changed upward 2mm, to a 27mm float height setting, as a starting point...
Well that’s interesting, I would never even have considered that.
Nicely done Steve!!
Excellent work 2M. This really points to float settings, 22mm 25mm whatever , is only a guide. Seems floats may never have been made even, the manuals suggest using tubing, (6mm), to do bowl fuel levels. The plastic tubing as a sight glass should be the final way to judge the carb bowl fuel level
Does anybody have the part number (BS-38) for the bowl drain screw with the nub for the plastic tubing to view fuel height ?? I believe it may be from Pro Motion. Thanks
tim
tim
Thanks for a great read, 2M. Folks, the bottom line is simple: real Mikuni parts are made to close tolerances, cheap repops are not, and defects are going to make a difference. You can't get something for nothing, but if you buy cheap enough you can easily get nothing for something.
I can see a lot of people bending and twisting these repo floats to try and make them work. Then after a month of that they throw them out or the bike gets set aside and in 20 years someone discovers it in some shed.
It's important to realize that unless the floats were dragging on the bowls, all this work was to improve the looks of something that you can't see. And if the work was necessary, it was done here in the most craftsman-like way, not the easiest way.
I'm not aware of a Motion Pro tool for checking the fuel level on the BS38s, but maybe they have one. I got this one from this eBay seller, it works well .....
https://www.ebay.com/itm/Carb-Float...m=273099883552&_trksid=p2047675.c100011.m1850
https://www.ebay.com/itm/Carb-Float...m=273099883552&_trksid=p2047675.c100011.m1850
