Dream Yamaha XS650 Big Bore Build | Pt 4 Bottom End Build

Hi All,
Sorry its taken a while but here we go!

[@jiyushugi1085]

Beautiful work. So nice to be able to build engines at one's own pace. During the mid-seventies, when I was a 20-year-old 2nd-year pro and had just moved up to 750s from the 250s, I asked a well-known builder to put an engine together for me. The engine ran, but was down on power, so I started working on it myself. Upon inspecting the cases I noticed that he'd made two small holes in the oil gallery than runs through the front of the crankcase so as to allow oil to, I supposed, cool the pistons or to direct cool oil to the rods. Never had a chance to ask him about that, though. However, when Suzuki released the GSXR750 much was made about the 'piston cooling jets' that directed cooling oil to the undersides of the pistons, a practice that many others have now copied. Anyway, one more thing to ponder....

[@danryan4997]

Thank you, the whole process has been a good and challenging experience.

[@richardsouthey430]

Looking good ,some great improvements, can not to hear it running . Richard

[@danryan4997]

Hi Richard, thank you, in pt 8 I have the engine running in that video. The intro engine sound at the start of the video is the actual sound also.

[@richardsouthey430]

@@danryan4997 ok thanks, I will watch that one 👍 I have got a xs 650 flatracker .

[@danryan4997]

I just realised I didn't mention the Yambond 4 Motorsport. This is what I used to seal the crank cases.

[@jiyushugi1085]

Yamabond is great, even Honda eventually got around to copying it.

[@paulhoward1907]

Brill Dan,👌

[@danryan4997]

Thanks

[@timh1187]

Dang good job. This is quite a bit of money and time. I got a donor motor to attempt something similar. Worried about parts getting here in a timely fashion.

[@danryan4997]

Thanks Tim, originally I wasn't going to go this far with the motor but then I thought if I am going to be having the crank out I may aswell do what I can and decided to go the rephased direction with it. Yes parts can take a while...

[@winterwolf069]

Was it really as easy to do, as you made it seem?

[@danryan4997]

Yea the bottom end is far more straightforward than the top as you just need to follow assembly instructions. The top end however can be done many ways and different specs that make it much more complex.

[@robgray553]

Great video Dan, thanks for uploading. I will be following this when we start the build soon. I need that oil pump upgrade now! Lol. Is it from Heiden? And the sump?

[@robgray553]

@@danryan4997 nice, will take a look now. Need to make sure I really clean the cases out incase of blockages etc.

[@danryan4997]

Yes absolutely, make sure you know where the oil way's are. I found carb cleaner was the main thing to really get it all clean followed by warm soapy water, hose piped through and blew off / through with the airline 👍

[@robgray553]

@@danryan4997 thanks for the tips mate, will be making sure everything is cleaned. How much was the sump? Been looking on his site but no prices I can see. Have you decided colour scheme for yours yet?

[@danryan4997]

No problem Rob, around £140 for filter housing / sump. Well worth it for the screw on filter system.

[@danryan4997]

As for colour scheme... really not decided yet. The frame is ready for powder coating so need to decide soon.