Author Topic: kx500sf project (Read 80549 times)

jonny500 · « **Reply #120 on:** February 16, 2011, 08:53:40 AM »

rang applebees today, and my crank is being done now and should be back very soon. dutchy, i asked about the balance factor and it is 50%, when they return the crank they are going to send a cd with pics and a vidio of how they did it. obviously this will be shared with kxriders.com

Dutch-K5 Fan · « **Reply #121 on:** February 17, 2011, 06:44:35 AM »

Hi Jonny.
Thanks for asking about the balance factor, I have found how you could balance a crank at home.
And best of al what 50% balance factor means. I'm making a rig for my crank to balance it, and will post all the info
and pic's.

Dutchie

jonny500 · « **Reply #122 on:** February 17, 2011, 06:47:03 AM »

i should have the bike running soon so will be able to give some feedback on how it runs

jonny500 · « **Reply #123 on:** February 23, 2011, 06:36:46 AM »

crank is back, piston has the port in. i have cleaned and instaled the power valves with the doordie pin flip. cases are cleaned and have a new set of bearings

Motorrad · « **Reply #124 on:** February 23, 2011, 06:45:14 AM »

Looking good... Is all the weight only taken off one crank web??
I'm curious what your ring end gap measures at.. As mine was way loose...

jonny500 · « **Reply #125 on:** February 23, 2011, 07:00:40 AM »

no there is more removed from the other web at the oposite side. i dont have any feeler gauges but my gap is less than 1mm. the piston feels really lose in the bore. this is my first 500 rebuild and my first with a forged piston. if you need me to a will get some feelers

Motorrad · « **Reply #126 on:** February 23, 2011, 07:05:33 AM »

Quote from: jonny500 on February 23, 2011, 07:00:40 AM

no there is more removed from the other web at the oposite side. i dont have any feeler gauges but my gap is less than 1mm. the piston feels really lose in the bore. this is my first 500 rebuild and my first with a forged piston. if you need me to a will get some feelers

If your gap too tight.. You will damage the motor....

jonny500 · « **Reply #127 on:** February 23, 2011, 07:40:09 AM »

just had a look at cylimer and ring gap should be 0.15-0.35 with service limit at 0.7mm. i will check it properly tomorrow

Motorrad · « **Reply #128 on:** February 23, 2011, 08:11:34 AM »

Quote from: jonny500 on February 23, 2011, 07:40:09 AM

just had a look at cylimer and ring gap should be 0.15-0.35 with service limit at 0.7mm. i will check it properly tomorrow

Be warned.. I believe the specs. The Clymer are wrong... I'm sure other motor builders on here will agree that .006" on ring gap on a 86mm bore is bad juju...
I know wiseco wants it set at .013". And some say .016". Sorry. I don't work in metric...

jonny500 · « **Reply #129 on:** February 23, 2011, 08:24:02 AM »

i have just very crudly measured it with a peice of folded up paper and a digital vernier. i make it the top end. 0.35mm or 0.014". i think i should be ok but i will be checking it properly tomorrow. thanks for the tip motorrad. i have come across mistakes in books before and they have caused me some headaches lol

DoldGuy · « **Reply #130 on:** February 23, 2011, 08:36:11 AM »

Johnny,
Make sure to chamfer the piston window also, as I had less than 4 hours on mine & could see wear marks in the new plating. Everything is looking good on your build & I am interested in your frame work as I have a chassis waiting for a transplant

DoldGuy

DaveEngineering · « **Reply #131 on:** February 23, 2011, 08:36:37 AM »

Quote from: jonny500 on February 23, 2011, 07:00:40 AM

no there is more removed from the other web at the oposite side. i dont have any feeler gauges but my gap is less than 1mm. the piston feels really lose in the bore. this is my first 500 rebuild and my first with a forged piston. if you need me to a will get some feelers

i'll bring you a set of feelers tomorrow Jon, I've got metric and Imperial.

Quote from: Motorrad on February 23, 2011, 08:11:34 AM

Be warned.. I believe the specs. The Clymer are wrong... I'm sure other motor builders on here will agree that .006" on ring gap on a 86mm bore is bad juju...
I know wiseco wants it set at .013". And some say .016". Sorry. I don't work in metric...

Dont worry, Here in England we use both.

jonny500 · « **Reply #132 on:** February 23, 2011, 08:57:19 AM »

nice 1 dave

doldguy, i will be giving the piston the once over before fitting, anything you need to know about the frame just post on here and i will help in any way i can. thanks to all

don46 · « **Reply #133 on:** February 23, 2011, 09:07:02 AM »

OK, so I must have missed something over the years, what is the doordie pin flip? Are you talking about on the KIPS flapper valve?

DoldGuy · « **Reply #134 on:** February 23, 2011, 09:10:13 AM »

Yeap! Pull the pins and swap ends & reinsert. IMO the pins are cheap enough to just replace & I bought a new center valve & will fight with the old one later.