Zoöid Third Times a Charm CB175
- Thread starter Texasstar
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Texasstar
Can't is a four letter dirty word
Thanks guys! Simo had mentioned that link before on Victoria's string. He also said we should have used the 5th gear .96:1 from a cb200 in place of of the 1:1. He was right. We were able to wind out to 12.5k no problem in 5th on Victoria. I think we could have made a few more top end MPH.
While we have Bryan's transmission apart we are pulling a cb200 and cb160 apart for comparison. We also have an xr250r tranny coming. You never know when a motorcycle feels like it wants to be a six speed.
oh and all our trannies use the same oil drain pan. LOL we may have to do some surgery though and lose 10mm off the main shaft.
Next up is solving the flappy mouth politician cam chains so the slipper cam chain tensioner is on the silver tray. Zeke has been practicing welding on cast aluminum.
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While we have Bryan's transmission apart we are pulling a cb200 and cb160 apart for comparison. We also have an xr250r tranny coming. You never know when a motorcycle feels like it wants to be a six speed.
oh and all our trannies use the same oil drain pan. LOL we may have to do some surgery though and lose 10mm off the main shaft. Next up is solving the flappy mouth politician cam chains so the slipper cam chain tensioner is on the silver tray. Zeke has been practicing welding on cast aluminum.
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Quixotay
New Member
Texasstar said:We also have an xr250r tranny coming. You never know when a motorcycle feels like it wants to be a six speed.
If your gonna go through the trouble of adding a gear (6 speed) , might as well make it a 12 speed....
http://www.motorcyclemuseum.org/asp/classics/bike.asp?id=123"flappy mouth politician cam chains".... Bwhahahhahahahha
Texasstar
Can't is a four letter dirty word
Wow that would be a blast to ride...I can imagine having a high low on my Bultaco!Q said:If your gonna go through the trouble of adding a gear (6 speed) , might as well make it a 12 speed....
"flappy mouth politician cam chains".... Bwhahahhahahahha
Texasstar
Can't is a four letter dirty word
Here is a crack in one of the cases that has been vaporhoned and then cleaned with acetone. You can see how impregnated the case was with oil when Zeke tried to TIG the top oil started oozing out of the crack inside the case. We were told you couldn't do this so we went ahead anyways.
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Texasstar
Can't is a four letter dirty word
Teazer you told us before that the transmission starts breaking down in the 176 once you get up over 30 hp. Some of the dogs are undercut and others are not. Is there a reason for this and it seems that going into second gear that the dogs have less to hold onto than the other gears??? I've noticed in the newer transmissions like in the 80s they used a needle bearing on the end of the countershaft and the mainshaft??? Is this primarily where the weaknesses lie?teazer said:
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Transmissions will start to twist and bend under load and gears start to fall out. IMHO Needle roller bearings are a huge improvement over bushes but they cost more and require a hardened surface to run on.
Undercuts help to hold the gears in mesh but the harder they grab, the harder it is to change out and into the next pair, so it's always a compromise. Most transmissions have some undercuts and some gears with straight pegs/dogs. I haven't really thought that much about which need undercuts, but I would guess that lower gears would need it more than higher gears because they transmit more torque. Second and third are used more than the others, so maybe they need it more.
Undercuts help to hold the gears in mesh but the harder they grab, the harder it is to change out and into the next pair, so it's always a compromise. Most transmissions have some undercuts and some gears with straight pegs/dogs. I haven't really thought that much about which need undercuts, but I would guess that lower gears would need it more than higher gears because they transmit more torque. Second and third are used more than the others, so maybe they need it more.
Texasstar
Can't is a four letter dirty word
That makes sense. Zeke and I will go out to the shed tonight to look at the undercuts and report back. Before the quick shifters that we have today did they ever eliminate the need for neutral off of the shifter drum? Shortening the distance and time between 1 and 2 gear changes?teazer said:
A few rare bikes had neutral below first to make it easy to find and as a consequence making the 1-2 shift fractionally faster.
What's a slowshifter? We use an air ram with momentary kill device for full throttle no clutch shifts on the 1/4 mile. So much faster... No need to back out of the throttle at all just press teh button for almost instant gear changes.
Not so suitable on a race track or the street but can't beat them for speed.
What's a slowshifter? We use an air ram with momentary kill device for full throttle no clutch shifts on the 1/4 mile. So much faster...
No need to back out of the throttle at all just press teh button for almost instant gear changes.Not so suitable on a race track or the street but can't beat them for speed.
Texasstar
Can't is a four letter dirty word
speaking of OCDR Bill Baxter wentteazer said:A few rare bikes had neutral below first to make it easy to find and as a consequence making the 1-2 shift fractionally faster.
What's a slowshifter? We use an air ram with momentary kill device for full throttle no clutch shifts on the 1/4 mile. So much faster...
Not so suitable on a race track or the street but can't beat them for speed.
7.94 @ 164 in eliminations
he was so far ahead he let off!
