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Any local shops to get an undercut transmission?

A

acpigeon

Member
Joined
Oct 13, 2020
Location
Oakland
Moto(s)
Ducati Hypermotard
I need to get my Ninja 400 transmission undercut (IYKYK). Before sending it off to Spears or someone else, I was wondering if there were any Bay Area shops that do the service. Would also appreciate experiences that any of you can share about where you got this work done and how happy you are with the outcome.

Thanks!
 
I had a Suzuki 650G that started popping out of second gear while under throttle. I pulled the engine, split the case, and removed all the gears. I mailed them down to Vance and Hines in So Cal. I got the gears back, all the engagement dogs undercut, installed them and put the engine back in the bike the morning I was set to ride to Seca for the weekend. It all worked perfectly and I arrived at the track in time.
 
You could maybe check with Jim at Catalyst Reaction. While I haven't asked him to do this specific service, he does do a lot of engine work on bikes. I imagine he should be able to do this for you.
 
You’ve got to be kidding. First off, it’s impossible to reach all the dogs through a hole. Second, you can’t to the job with a grinder. And thirdly, the transmission would be filled with the remains of the grinding stones plus fragments of what you were able to grind.
 
ST Guy said:
You’ve got to be kidding. First off, it’s impossible to reach all the dogs through a hole. Second, you can’t to the job with a grinder. And thirdly, the transmission would be filled with the remains of the grinding stones plus fragments of what you were able to grind.
Click to expand...
Not kidding
It was more of a hatch, or casted pan (but OP's bike is likely different)
Yes you can
Rags and kerosine flush

And one more thing, tweaked the shift fork closer to the right shape

Now, I bought this bike from an ex military guy who bought it new before being deployed. It sat in his garage enough years for the air to leave the tires and the rubber to melt into the pavement. We had to yank it loose. The tires still held air and it had 10k miles on it. My girlfriend dropped me off there in Santa Cruz to get it and I rode it home.

I rode it hard in the hills and had many a street races for 15k miles before it started popping out of second. I would hold the shift lever up to keep it into gear, until that started failing. It got so bad that it would slap the dogs under any load.

After the hillbilly grinding was done, it was great for another 15k miles of abuse, until I got sideswiped on the freeway on another bike and quit riding for 7 years. Somewhere during that period, I regretfully sold my bikes.

It was fabulous while it lasted (y)
 
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Well, I think that’s a remarkable tale. And I find it amazing that it seemed to do the job.

However, I’d never recommend doing it that way.
 
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