Bucket Blues

[Sketchy_Racer]

it should say on the side??

[Sketchy_Racer]

or do what speedpro says

[Ivan]

or how about run no oil at all


weight reduction

[gav]

Hey Steve K, how's that gearbox coming along? Got it sorted?

[steve k]

hopefully will have a diagnosis by the end of the week. Still heaps of other stuff to do on the motor. in fact might head out to the shed tonite and get a bit more done.

I have the original 5 speeder but really do not want to conceed and put that in.

will let you all know what the out come is.

cheers

[steve k]

Managed to make some headway on the gearbox thanks to f5 dave. after looking at all components it is looking like the selector forks are not the correct ones. Both gear clusters and shimming look correct and where pretty sure the selector drum is correct.

So its back to the chap I got the gearbox off to see if we can track down the correct selectors.

nothing like incorrect parts to put a dent in ya current bout of motivation to finish the project aye.

[gav]

Nasty! I've just had a complete MB5 bottom end turn up, it even seems to select six gears as well. After I bought it, had a sudden thought that maybe someone had already swapped it out and fitted a four speed back into the 50, but hopefully should be sweet. But I'm leaving it to an expert to fit, aye DP, cheers mate!

[steve k]

Nasty! I've just had a complete MB5 bottom end turn up, it even seems to select six gears as well. After I bought it, had a sudden thought that maybe someone had already swapped it out and fitted a four speed back into the 50, but hopefully should be sweet. But I'm leaving it to an expert to fit, aye DP, cheers mate!

Is a bit nasty. Have had a chat to the guy I got it off and he is having a look to see if he can find the correct forks.

in the meantime anyone out there got a spare set of selector forks for a mb5. could always use a cr80 gear box but that wouldnt be in the spirit of bucket racing now would it

[steve k]

Well theres been a major breakthrough with the gearbox. selector forks have been sourced and tested and i now have a functioning 6 speed box. :spudflip:

Big thanks to Peter at Total Motorcycles for sorting out the problem. Also big thanks to f5 dave for helping out to diagnose the prob.

Will have the head and barrel back from the shop this week so wont be long now till start up. Mind you I have been saying that for about the last year. Well motivated now to get the project finish.

will post picies once it is all done.

[dangerous]

Good shit Steve, now get it running and get some race k's up... then regester for the MOTOequip Battle of the Buckets and join Skunk in traveling down and race all day.

BOB thread/ http://www.kiwibiker.co.nz/forums/sh...ad.php?t=29094

[F5 Dave]

Glad to hear it. Rule 1 is once enthusiasm is flowing run with it. If it starts flagging then get the bike running & finish things to the way you want them later.

[steve k]

Barrell and head have now returned from the machine shop so I should really get my a into g and finish the bloody thing. will most likely not be ready for the next bucket meet but will try.

[speedpro]

Assemble it all up using old gaskets and measure squish clearance. I use a bit of thin solder double-doubled and twisted. I poke it down the plug hole with the piston down. With a bit of a bend in it you can get it to go over to the side of the bore. If you now turn the crank gently till the pistons taps the solder and then rock it back and forth till it finally turns right over TDC the solder will be flattened to the squish clearance. Pull it out and measure it with calipers. Be careful as the squish could be cut on a different angle to the piston crown and the squish will therefore vary from inside to outside. Once you've done it once, snip the used bit of solder off and do it again at a different point round the bore. Do it at 4 places minimum, especially if you have the squish down round .7mm. If you've machined for a lot of compression, or even if you haven't, you have to check the compression. I'm lucky enough to have a couple of syringes which makes it easy. The method I use is to get the piston very close to TDC. Mount the motor in the vice with the plug hole on top. Use the syringe to measure in some oil. I use fork oil. Rock the crank just back and forth a tiny bit. Keep squeezing in a little bit more then rocking the crank till the oil is 2 threads up the plug hole. The amount you've measured in is the combustion chamber volume. I use calipers to measure the amount of movement of the syringe plunger. With the bore of the syringe it's easy to work out the volume per cm or movement. Then you add the chamber volume to the measured swept volume and then divide that by the chamber volume to get the compression ratio. Anything round 12-13 is OK, 14 is good, and 15 is pushing it. You need to measure the chamber volume at least twice. If your measurements vary then do it a third time. You have to take the head off and clean it between measurements.

It can be a pain in the arse but can be the differance between a good motor and a VERY good motor, or one that chernobles and one that doesn't.