KX Riders

Maintenance & Technical => KX500 Original => Topic started by: kxs in oz on May 07, 2007, 10:10:42 AM

Title: kx 420 resto
Post by: kxs in oz on May 07, 2007, 10:10:42 AM

Hey guys have just finishing my lattest project 1981 kx420 with a GP 443cc engine kit

Title: Re: kx 420 resto
Post by: Spider on May 07, 2007, 11:15:15 AM

Sweet, Love that swing arm.

Dale

Title: Re: kx 420 resto
Post by: mg82 on May 07, 2007, 12:15:45 PM

WOW!! you did a hell of a job on that. great job. do you have any progression pics of the project?

Title: Re: kx 420 resto
Post by: alan on May 07, 2007, 12:37:50 PM

Very Very Nice!! :-o :-D :? :roll: :-o :-D

Title: Re: kx 420 resto
Post by: 5dracing on May 07, 2007, 01:16:31 PM

Wow!! Nice work. I took one look at that bike and a bunch of painful memories came back!!! 16 yrs old and ba!!s that were bigger than my brain.

Title: Re: kx 420 resto
Post by: stewart on May 07, 2007, 03:45:50 PM

i love that bike  i had a 1981 kx 420 is that for sale

Title: Re: kx 420 resto
Post by: MadKaw on May 07, 2007, 04:08:33 PM

very nice work, that's a work of love...I wouldn't sell it.

Title: Re: kx 420 resto
Post by: kxs in oz on May 07, 2007, 07:22:31 PM

Sorry not for sale i build these bikes for my son something for his future put to much time into finding NOS parts to build these bikes cheers

Title: Re: kx 420 resto
Post by: hughes on May 08, 2007, 05:27:05 AM

There's only one thing better than old school bikes and that's riding them. Sweet bike.

Title: Re: kx 420 resto
Post by: FuriouSly on May 08, 2007, 06:57:46 AM

I'm in love....  very nice bike.  Great Job!  Dig the Gold ano....

Sly

Title: Re: kx 420 resto
Post by: alan on May 08, 2007, 09:35:46 AM

Where did you get the Gold ano.... Done?

Title: Re: kx 420 resto
Post by: kxs in oz on May 08, 2007, 11:14:42 AM

It took 2 years of serching for NOS parts to build this bike BDI and new parts are no longer availible as for the gold alan it is a urethane 2 pack paint i had made to suit anodising wouldnt come up nice because of the cast finish on the alloy it was to dark no depth in colour

Title: Re: kx 420 resto
Post by: hangtime on May 08, 2007, 03:51:32 PM

Hey kxsinoz, nice that the rim color on those new excels is pretty d**n close to your paint. Good looking bike. I just got a 420 motor and I am thinking of building an ultralite aircooled bike with a new generation aluminum frame. I have a tech question for you. How long does the motor on your 420 run before you notice a drop in performance due to it being air cooled? I typically am looking at 20 minute motos and am wondering if the performance loss would be noticeable. Thanks.

Title: Re: kx 420 resto
Post by: kxs in oz on May 08, 2007, 04:24:44 PM

Hi hangtime 20 min motos should be fine just make sure that you use a dome top piston in it and get the squish done i have just rebuilt mine and have got it out to 482cc goes great also they need a hole in the piston on intake side because this engine has not transfer ports on the intake track the hole needs to be about 20mm when the engine is at BDC mark the piston with a marker showing the port size on the piston skirt then put hole in the center of the marking and dont run to much comp you wont get any top end cheers hope this helps need to know more just ask