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Post by steve63 on Aug 9, 2023 12:58:22 GMT 1
Will the two different stator/rotors/cover not fit the same crank & cases and just allow a swap? I ask that as the cases look to have the same fittings spacing etc. I'd be a bit worried about reusing the crank from the blown motor when the other one looks so good and be trying to swap the stator/rotor and poss the cases over to use as much of the better engine etc Also... can you not just swap wires to make the different one work? Im going to say the left one looks 'earlier' as its more like my XT500, ie 70s, the right one looks like an LC/YPVS etc so 80s. The left one is the 'original'. I say that in inverted commas because it's had an engine swap anyway. I have put the original crank away and not looked at it since but it's definitely different on the taper than this one. I don't think the rotors will swap. There are the same number of wires on both but arranged in different blocks and different colours. I'm reluctant to start swapping wires or connecter blocks in case I ruin both. The crank in mine feels fine. My only slight concern are the marks on the top of the rod. Did it bend the rod? If it did then it's not a lot which would be easy to see. If it's a tiny bit then it's much harder to spot and I don't know how I would check it. I recently bought a surface plate, V blocks and a dial with magnetic stand so I might try rigging something up with those.
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Post by JonW on Aug 9, 2023 13:38:30 GMT 1
sounds like youre on it Steve, let us know how you go.
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Post by Tobyjugs on Aug 9, 2023 14:41:15 GMT 1
Easiest option is just to replace the con rod after such damage.(best advice) With the conrod stripped measure the distance accurratelybetween the small end and big end. Not from center to center but edge to edge. Shortest distance. Another check which sometimes works is just to draw a straight line through the conrod and visually look at it. I once was supplied a bent con rod Which I fitted and run the engine up. The combustion on that cylinder was a bit ropey. After shit loads of checks, pulling my hair out and sleepless night, I noticed the piston crown was 4mm lower than the rest at TDC. with the conrod lying on the work shop floor I could not see anything until I drew a line through the center of the con rod. Then it became very obvious.
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Post by steve63 on Aug 9, 2023 15:57:55 GMT 1
Easiest option is just to replace the con rod after such damage.(best advice) With the conrod stripped measure the distance accurratelybetween the small end and big end. Not from center to center but edge to edge. Shortest distance. Another check which sometimes works is just to draw a straight line through the conrod and visually look at it. I once was supplied a bent con rod Which I fitted and run the engine up. The combustion on that cylinder was a bit ropey. After shit loads of checks, pulling my hair out and sleepless night, I noticed the piston crown was 4mm lower than the rest at TDC. with the conrod lying on the work shop floor I could not see anything until I drew a line through the center of the con rod. Then it became very obvious. That sounds like a big con rod. Was it out of a ship? I worked on dock for a little while and saw a piston with a con rod attached and it must have been 2m tall on the dock side.
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Post by Tobyjugs on Aug 9, 2023 16:13:55 GMT 1
The Pride of York. That really was the boat that rocked. A terrible boat with a fantastic crew and great atmosphere.
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Post by steve63 on Aug 9, 2023 16:56:49 GMT 1
The Pride of York. That really was the boat that rocked. A terrible boat with a fantastic crew and great atmosphere. Ah one of the North Sea Ferries? Was that one of the ones that sailed to Zeebrugge from Hull and back? We live about 4 miles from the terminal and have been on it a few times if so. The smaller ones to Belgium were our favourites. Sadly they no longer do that sailing. We're off on the Hull to Europort one next month for a long weekend.
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Post by steve63 on Aug 9, 2023 17:55:07 GMT 1
It would seem I have been talking b@llocks. The crank seems to be exactly the same in engine 2 as the one in engine 1. I realised all the cranks for sale on eBay looked the same. Once the rotor is off it became clear. Lesson: don't jump to conclusions! So plan now is to clean this one up, fit the alternator etc. off No. 1 engine, clean and re-fit the top end, fit engine and set off straight back to Edinburgh. Might be lying about the last bit 🤔
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Post by donkeychomp on Aug 9, 2023 21:21:05 GMT 1
It would seem I have been talking b@llocks. Welcome to my world... Alex
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Post by JonW on Aug 10, 2023 0:40:31 GMT 1
great news, i couldnt quite believe Yam would have changed that design so radically so its great to know that you can do what you need with the 2nd engine. phew!
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Post by Tobyjugs on Aug 10, 2023 3:12:11 GMT 1
Yes from Hull to Zeebrugge.
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Post by steve63 on Aug 10, 2023 13:07:41 GMT 1
It would seem I have been talking b@llocks. Welcome to my world... Alex . I'm usually into checking my facts before opening my mouth but on this occasion I jumped in feet first. As the saying goes: "assume makes an ass of u and me." . Looking yesterday at the cranks for sale and then looking last night at the inside of the rotor I realised that what I was looking at was just the internal casting of the rotor, the part that goes onto the crank. Once the rotor was off it became clear.
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Post by JonW on Aug 10, 2023 13:40:19 GMT 1
Right, no excuse then not to just swap the leccy bits over and whack it in after a quick blast of 'engine restorer'... er, rattle can silver!
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Post by steve63 on Aug 11, 2023 12:09:14 GMT 1
Right, no excuse then not to just swap the leccy bits over and whack it in after a quick blast of 'engine restorer'... er, rattle can silver! I can always find an excuse . This afternoons is that it's warm and dry. I may just swap the top box back onto the VFR and go for a meaningless ride about. After all I've ridden in nothing but rain for the last 1,200 miles
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Post by donkeychomp on Aug 11, 2023 22:49:16 GMT 1
Good for you! Just remember the VFR has a smidgen more oomph than the Yamaha...
Alex
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Post by steve63 on Aug 12, 2023 18:34:21 GMT 1
Good for you! Just remember the VFR has a smidgen more oomph than the Yamaha... Alex Yeah I realised that as soon as I set off. But I soon adjusted. Went up to Seaways Cafe on the B1238. If you live anywhere around here you will probably know the road. Had a cuppa and a scone and rode back. It's nice to have the option of overtaking cars when they get in the way instead of getting stuck behind them.
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