|
|
Post by 2strokd on May 23, 2011 16:56:29 GMT -5
Looking forward to that :popcorn: ! Ide love to get Skeedr on one. I was told by a well known pro tuner that ide have to have 15HP to be running the ET,s i do with the weight my scoot and i are at right now. Someday...someday  |
|
|
|
Post by lshigham on May 23, 2011 17:09:57 GMT -5
I'll take some pics, there's at least 15 of us going  |
|
|
|
Post by lshigham on May 24, 2011 13:28:00 GMT -5
Had a delivery today  |
|
|
|
Post by lshigham on May 28, 2011 16:03:24 GMT -5
Fraid the runner is no-more  End of last week the back wheel locked up, took the CVT cover off to find  After putting the belt back round the correct way (haven't a clue how it managed to flip) it wouldn't start. Took top end off to find:      :banghead: :swear: :rant: :censored: :bfg: We think it's recoverable with a diamond hone, as the nicasil underneath is intact. If not, it's £100 for a re-plate. To make matters worse, the vari side crank bearing failed at the same time! Andy (PedParts owner) said he'd rebuild it cheap and get the cyl sorted on his trade account with Langcourt if I dropped the scoot and engine down with the engine split. It's all boxed up, my father will drop it down Monday. Should be around a week depending on how long the cyl takes |
|
|
|
Post by thiess87 on May 28, 2011 20:39:11 GMT -5
god damn luke sry man how the hell did ur belt flip over :stars: :stars: :stars: |
|
|
|
Post by drawkward on May 28, 2011 21:37:55 GMT -5
Wow man. Sorry to see that. Maybe it wasn't a coincidence that the vari side crank bearing failed at the same time? Could a seized bearing cause that?
|
|
|
|
Post by stepthrutuner on May 28, 2011 22:13:39 GMT -5
The classic four corner seize. Hipo cylinders with a lot of open port space on the walls of the cylinder have more trouble transferring heat away from the piston since the rings spend less time in contact with the cylinder walls. Sometimes skimming a clearance band (0.06 - 0.1 mm deep) in the ring land area (approx. 3 - 4 mm below the bottom ring land to the top of the piston) is helpful in preventing seizures.
|
|
|
|
Post by lshigham on May 29, 2011 3:18:00 GMT -5
god damn luke sry man how the hell did ur belt flip over  I think, as Josh suggested, the belt flipping was related to the crank bearing going, creating some kind of side loading in the vari. |
|
|
|
Post by lshigham on May 29, 2011 3:22:48 GMT -5
The classic four corner seize. Hipo cylinders with a lot of open port space on the walls of the cylinder have more trouble transferring heat away from the piston since the rings spend less time in contact with the cylinder walls. Sometimes skimming a clearance band (0.06 - 0.1 mm deep) in the ring land area (approx. 3 - 4 mm below the bottom ring land to the top of the piston) is helpful in preventing seizures. I think it was because the piston had been rocking in the bore due to the crank bearings going, creating extra friction. It was running perfectly, as it had been for a week or so, before this lot all happened at the same time. I'll ask Andy about the clearance band idea, they've got a lathe |
|
|
|
Post by drawkward on May 29, 2011 23:05:03 GMT -5
The clearance band does sound like an interesting idea. Definitely something I would look into if I had a port config like that!! I was just noticing that cylinder has got quite a few spots that take most of the friction in between those massive ports.
|
|
|
|
Post by marshinman on May 30, 2011 5:50:22 GMT -5
What do the rings and piston look like?
Did you mic the rings to see if they are still within the wear limit?
The last time I saw that type of cylinder wear was due to a bad wrist pin and bearing.
|
|
|
|
Post by lshigham on May 30, 2011 6:37:51 GMT -5
The piston's siezed in the same way, 4 corner. Ring gap was within spec when it was put together a few days prior.
Dropped the bike off a few hours ago.
Andy want's go start with a known good cylinder (i.e a stock S6 racing), and then when I've had it running for a few weeks I can start to make changes, such as to a ported S6 racing. That also creates the opportunity to do a back to back, ported vs. unported.
|
|
|
|
Post by lshigham on Jun 3, 2011 15:18:40 GMT -5
Spoke to Andy today, he says the crank was perfectly aligned, even after the treatment it's received. The runabout is 4 thousandth's of an inch, within factory tolerances. The bottom end has been rebuild, I'm sending him my S6 Sport Pro pipe so he can do a back to back with a R1200. It'll be done with a blocked variator to demonstrate how the R1200 takes power from the low end and put's it up top. That way, I can see the difference before choosing which exhaust to use ;D Andy also knows exactly what to expect from a Sport Pro/S6 racing combination, so any problems can easily be identified. I plan be runnering again next weekend, can't wait as the weather here is great |
|
|
|
Post by lshigham on Jun 3, 2011 15:44:19 GMT -5
Oh, and I think we've solved the mystery of the failed crank bearings. The bearings I've been using are polymer caged SKF's. The problem is that the polymer melts at 120*c, so I've been deforming the cage when heating up the inner race to get the crank in. Melted cage = bearings rattling around = failed bearings |
|
|
|
Post by 190mech on Jun 3, 2011 20:38:06 GMT -5
Like we say down south;"A graduate from the school of hard knocks".Bet you'll never use plastic cage bearings again!!
|
|
