albyzee Posted August 20, 2018 Author Share #26 Posted August 20, 2018 WOW!! I'll bet if you can get your little finger down into the crankshaft hole a little ways, you will feel some threads. From looking at the bolt that is supposed to be there, there is a distance from the head to the threads. I would find an oem bolt and torque it to spec before continuing. Good job on the pictures. Probably saved your engine! I thank you for all the info you have given me. I would have never known there was a bolt that goes into that hole. OK I get it now a bolt goes there and its hollow. Thank you Thank you Thank you. Link to comment Share on other sites More sharing options...
Du-Rron Posted August 21, 2018 Share #27 Posted August 21, 2018 I thank you for all the info you have given me. I would have never known there was a bolt that goes into that hole. OK I get it now a bolt goes there and its hollow. Thank you Thank you Thank you. Glad to help out. I would still get with your dealer and Yamaha Customer Service to at least get a free bolt, washer, and cover gasket out of the deal. Maybe even installed by the dealer with some kind of extended factory warranty. Really Yamaha? No bolt from the factory?!?!? Link to comment Share on other sites More sharing options...
RedRider Posted August 21, 2018 Share #28 Posted August 21, 2018 (edited) This is very curious. There is no way the bolt couldn't have been there at some time. Torquing that bolt on is what forces the flywheel up onto the tapered shaft. The flats on the flywheel center allow you to hold the flywheel/crank when you tighten the center bolt. That bolt gets tightened to about 140 ftlbs (just pulled this off the top of my head, don't hold me to the number). If that bolt backed out, there's no place for it to go without destroying the stator. Very odd. There also appears to be some light corrosion on the flywheel and on the housing. I see here this could have occurred since you've had the engine open for a while. This is a wet area and everything should be very clean. Really looking forward to hearing what the dealer says about this. RR Edited August 21, 2018 by RedRider Link to comment Share on other sites More sharing options...
albyzee Posted August 21, 2018 Author Share #29 Posted August 21, 2018 This is very curious. There is no way the bolt couldn't have been there at some time. Torquing that bolt on is what forces the flywheel up onto the tapered shaft. The flats on the flywheel center allow you to hold the flywheel/crank when you tighten the center bolt. That bolt gets tightened to about 140 ftlbs (just pulled this off the top of my head, don't hold me to the number). If that bolt backed out, there's no place for it to go without destroying the stator. Very odd. There also appears to be some light corrosion on the flywheel and on the housing. I see here this could have occurred since you've had the engine open for a while. This is a wet area and everything should be very clean. Really looking forward to hearing what the dealer says about this. RR The dealer is faraway from me so I don't think ill be going there soon. Yes there is some rust due to it being opened for so long. I will clean that up best I can. I just took the cover off took nothing else off. My pictures are exactly the way it was. It was not there. If if did loosen and fell off it would be under the bike where Im working on it. It is nowhere to be found. I ordered the bolt and washer interesting its on back order. Makes me think how many other people need this. So I have to wait 7-10 days it has to come in from Japan. I'll keep you posted. I thank you for all your help you may have saved my life. Link to comment Share on other sites More sharing options...
wrscomncents Posted August 21, 2018 Share #30 Posted August 21, 2018 The dealer is faraway from me so I don't think ill be going there soon. Yes there is some rust due to it being opened for so long. I will clean that up best I can. I just took the cover off took nothing else off. My pictures are exactly the way it was. It was not there. If if did loosen and fell off it would be under the bike where Im working on it. It is nowhere to be found. I ordered the bolt and washer interesting its on back order. Makes me think how many other people need this. So I have to wait 7-10 days it has to come in from Japan. I'll keep you posted. I thank you for all your help you may have saved my life. Just curious where you found the part number on the bolt. It's strange because the manual shows the bolt but I can't find it on the parts list. It shows the pin and washer but not the bolt. Link to comment Share on other sites More sharing options...
Marcarl Posted August 21, 2018 Share #31 Posted August 21, 2018 Just curious where you found the part number on the bolt. It's strange because the manual shows the bolt but I can't find it on the parts list. It shows the pin and washer but not the bolt. Bolt, Flange 90105-12005-00 $6.23 Can be found under >crankshaft, piston Link to comment Share on other sites More sharing options...
wrscomncents Posted August 21, 2018 Share #32 Posted August 21, 2018 Bolt, Flange 90105-12005-00 $6.23 Can be found under >crankshaft, piston Okay I see it on the crankshaft page. Surprised it isn't listed with the pin. I don't need it just couldn't figure out where it was on the parts list. Thanks Link to comment Share on other sites More sharing options...
Flyinfool Posted August 21, 2018 Share #33 Posted August 21, 2018 Take another look all the way around the flywheel inside and outside for the bolt and/or washer to be sure they are not stuck to a magnet out of sight. Link to comment Share on other sites More sharing options...
albyzee Posted August 22, 2018 Author Share #34 Posted August 22, 2018 Just curious where you found the part number on the bolt. It's strange because the manual shows the bolt but I can't find it on the parts list. It shows the pin and washer but not the bolt. I got it off the Hammonton Yamaha dealer web site from the schematics they have. (Atlantic City Cycle Center) It's in the crankcase section. Link to comment Share on other sites More sharing options...
BlueSky Posted August 22, 2018 Share #35 Posted August 22, 2018 On partzilla.com, I found it on the crankshaft piston diagram. Link to comment Share on other sites More sharing options...
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