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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Norvin out of Dominator 88
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<blockquote data-quote="Pushrod Twin" data-source="post: 112574" data-attributes="member: 340"><p>Congratulations Greg, welcome to a life of misery. Now strip the crank itself, you cant afford to pretend it is good. There is no bearing ring in the factory standard conrods, the rollers run on the hardened rod like a Jap two stroke. When they are heat treated the largest mass of material is the confluence of the rod shank & BE bore. It is the slowest to cool. If Luigi didnt get the heating & quenching absolutely perfect, they are soft in the area of greatest bearing load, most of them are doomed to fail. I know we all hear stories of 100,000 Km & even mile, Bevel Ducatis, we hear those stories because they are exceptional for Bevels, most of them die well before that mileage. </p><p>Then look at the gear shafts where the rollers run on the shafts, there is a high likelihood that the bearings have pitted the shafts & the bores of the gears. If they havent, you have got lucky. I have considered the possibility of replacing the rollers with hard, aluminium bronze bushes, floating, 1/2 thou clearance inside & out, with oil scrolls turned into them. It's a bodge we used on Morris Mini & 1100 Crab gearboxes back in the day with success. </p><p>Because the 900SS is such a high value bike it's worth restoring, then you have options, polish it & put in the lounge, or move it on & make it someone else's problem. The electrics are the least of your issues. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p>Better to buy a 750 or 860 GT and fit a Vincent motor into it, then you can have a relaible classic special.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="Pushrod Twin, post: 112574, member: 340"] Congratulations Greg, welcome to a life of misery. Now strip the crank itself, you cant afford to pretend it is good. There is no bearing ring in the factory standard conrods, the rollers run on the hardened rod like a Jap two stroke. When they are heat treated the largest mass of material is the confluence of the rod shank & BE bore. It is the slowest to cool. If Luigi didnt get the heating & quenching absolutely perfect, they are soft in the area of greatest bearing load, most of them are doomed to fail. I know we all hear stories of 100,000 Km & even mile, Bevel Ducatis, we hear those stories because they are exceptional for Bevels, most of them die well before that mileage. Then look at the gear shafts where the rollers run on the shafts, there is a high likelihood that the bearings have pitted the shafts & the bores of the gears. If they havent, you have got lucky. I have considered the possibility of replacing the rollers with hard, aluminium bronze bushes, floating, 1/2 thou clearance inside & out, with oil scrolls turned into them. It's a bodge we used on Morris Mini & 1100 Crab gearboxes back in the day with success. Because the 900SS is such a high value bike it's worth restoring, then you have options, polish it & put in the lounge, or move it on & make it someone else's problem. The electrics are the least of your issues. :( Better to buy a 750 or 860 GT and fit a Vincent motor into it, then you can have a relaible classic special.:D [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Norvin out of Dominator 88
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