Drat! Crack in Gearbox Between Main and Lay on Drive Side

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Re: Drat! Crack in Gearbox Between Main and Lay on Drive Si

Ok DOX thanks for the ballpark mileage to consider on renewing tranny renewables but even more so on the evidence that even an exploded lay bearing did not crack your 'cleavage'. I've gotten about 10K on current factory Combat, and ~500 miles ago noticed clutch wobble when opening up for a lack of charging problem that turned out to be loose stator nuts. My last fling on Trixie a couple weeks ago, spinning rocks on 2S power band response for 5 miles then running rear flat at 80-90 for a few miles, is my last ride till whole drive train renewables gone through before needing to replace the assumed lasting 'non-renewable' shafts and cases and dog faces. I admit that last few 1000 miles with new tires that helped stifle THE Hinge, i've spent more time in lower gears at hi rpm power loads, knowing very well what I was using up sooner than later, but ah the memories are priceless. I don't know if my cracking logic is correct but can't think of better explanation with your and mine and others crack or crackless reports while reading between the lines of how long they ran w/o looking in till too late.

Webshots has been sold and restricted photo access otherwise this is where I'd post the 7th day of pre-Peel drag strip launch at like 6000 rpm clutch drop that folded the rear tire up to take the normal 45' wheelie launch to vertical and crash on me but no crack in tranny just spun races in the wallowed out bores. The photo is a featured item in man cave of owner of the wheelied barred 1200 over cammed Sportster I leaped out ahead of past the X-mass tree lights. Not many load their factory Combats like that, so what's that imply in causation of crack?
 
Re: Drat! Crack in Gearbox Between Main and Lay on Drive Si

DOXFORD said:
works out I did gearbox roughly every 10 years or 30 -35 thousand miles since owned from 1978. The bike is a 69 about 3 years after purchase the gearbox layshaft bearing let go {exploded} which also resulted in damage to 1st layshaft gear so had to replace this too. After that I have opened up and checked all components about every 10 years. I always replace both bearings and any suspected slopy bushings at this time. When the layshaft bearing went the kick lever spun around and slammed into the back of my foot trust me it hurts so this prompted me to open gearbox and do some periodic preventive maintenance. aside from the initial lay shaft bearing failure I have not had any troubles with bearings, shafts, gears, or bushings in the transmisson gearbox. Bearings and bushings are low cost items as compared to gears and shafts.
Dox

Not a bad practice. What I learned the hard way was after any carnage type failure to check the layshaft and main shaft for straightness. I had a recurring problem which I finally traced to a bent main shaft and lay shaft that resulted from an intital catastrophic failure of second gear (thanks to a foolish operator (moi), in conjunction with a Barnett Clutch and Drouin Supercharger).
 
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