BR46 Posted September 9, 2020 Share #1 Posted September 9, 2020 I think I found out what was making the little knocking noise in the sidecar motor. 1 Link to comment Share on other sites More sharing options...
donkpow Posted September 9, 2020 Share #2 Posted September 9, 2020 2 2 Link to comment Share on other sites More sharing options...
Parr8hed Posted September 9, 2020 Share #3 Posted September 9, 2020 Is that a bent connecting rod in the top pic? the piston and valve both seem incredibly unhappy. Sleeve OK? Can you just rebuild the bottom end with a new piston and rod? Link to comment Share on other sites More sharing options...
Further Posted September 9, 2020 Share #4 Posted September 9, 2020 Is the bottom salvageable ? Any idea why ? Link to comment Share on other sites More sharing options...
Popular Post groupw Posted September 9, 2020 Popular Post Share #5 Posted September 9, 2020 Some steel wool, Marvel Mystery Oil and a 10mm socket and all will be good. 4 1 Link to comment Share on other sites More sharing options...
Scrapr ★ Posted September 9, 2020 Share #6 Posted September 9, 2020 I'd try buffing it out first 2 Link to comment Share on other sites More sharing options...
BR46 Posted September 9, 2020 Author Share #7 Posted September 9, 2020 52 minutes ago, Parr8hed said: Is that a bent connecting rod in the top pic? the piston and valve both seem incredibly unhappy. Sleeve OK? Can you just rebuild the bottom end with a new piston and rod? That is a bent connecting rod. The sleeve is junk. I will be able to save the high performance camshaft. Maybe the cylinder head as for the crankshaft it will be cheaper to build a new one. The crankshaft is pressed together and I weld them together when I get them setup and trued. I can save the transmission but there's nothing special about that. I'm going to pickup a different motor and start over. 1 Link to comment Share on other sites More sharing options...
Ralphie ★ Posted September 9, 2020 Share #8 Posted September 9, 2020 Ouch! Why did you do that? Link to comment Share on other sites More sharing options...
jsharr ★ Posted September 9, 2020 Share #9 Posted September 9, 2020 Link to comment Share on other sites More sharing options...
Bikeguy Posted September 9, 2020 Share #10 Posted September 9, 2020 Holy shit.. that must have been a loud knocking noise. With the bottom of the piston missing.. I suppose it just broke apart, and slammed up into the valves. The connection rod and crankshaft just never stopped... I was guessing you just had to know what happened. You can sleep now. Link to comment Share on other sites More sharing options...
sheep_herder ★ Posted September 9, 2020 Share #11 Posted September 9, 2020 4 hours ago, jsharr said: That is just the way he looked, when we saw him in South Dakota in the late 60s. 2 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 9, 2020 Share #12 Posted September 9, 2020 Going fast costs money. How fast do you want to go? So what do you think happened? Seized gudgeon? 1 Link to comment Share on other sites More sharing options...
BR46 Posted September 9, 2020 Author Share #13 Posted September 9, 2020 43 minutes ago, maddmaxx said: Going fast costs money. How fast do you want to go? So what do you think happened? Seized gudgeon? The connecting rods are stock and under normal operating conditions are fine but this motor spends most of it life around 8,000 RPMs. So we are looking into see if the oil holes for the wrist pins need to be modified. The other piston looks good but the wrist pin connecting rod has a lot of slop and is blue from heat. I'm thinking that the piston that broke had the wrist pin seize. 2 Link to comment Share on other sites More sharing options...
Popular Post Airehead Posted September 9, 2020 Popular Post Share #14 Posted September 9, 2020 9 hours ago, groupw said: Some steel wool, Marvel Mystery Oil and a 10mm socket and all will be good. Marvel Mystery Snake Oil can fix anything. 3 1 2 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 9, 2020 Share #15 Posted September 9, 2020 gudgeon was used expressly for Ralph's enjoyment. 1 1 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 9, 2020 Share #16 Posted September 9, 2020 1 minute ago, Airehead said: Marvel Mystery Snake Oil can fix anything. It's good stuff, but it can't fix a broken lampshade. 1 Link to comment Share on other sites More sharing options...
Parr8hed Posted September 9, 2020 Share #17 Posted September 9, 2020 9 hours ago, BR46 said: That is a bent connecting rod. The sleeve is junk. I will be able to save the high performance camshaft. Maybe the cylinder head as for the crankshaft it will be cheaper to build a new one. The crankshaft is pressed together and I weld them together when I get them setup and trued. I can save the transmission but there's nothing special about that. I'm going to pickup a different motor and start over. If you’re getting a different motor might as well add a few cylinders. Link to comment Share on other sites More sharing options...
Popular Post Rattlecan ★ Posted September 9, 2020 Popular Post Share #18 Posted September 9, 2020 4 1 1 Link to comment Share on other sites More sharing options...
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