It's like trying to have an intelligent discussion with a piece of would
It's like trying to have an intelligent discussion with a piece of would
there is a fair few more here as well.
but stick with the NF4
https://www.kiwibiker.co.nz/forums/s...post1131093900
Kinky is using a feather. Perverted is using the whole chicken
Thanks thats been a big help , going by the parts book it has a short header pipe not included in the drawings do you have the spec for that also?
I see in the parts book it has an air box are they an improvement on an older race engine
We had a couple of months off racing over winter so I have had some time to get a few improvements ticked off my list.
https://scontent.fakl8-1.fna.fbcdn.n...68&oe=5DE10921
https://scontent.fakl8-1.fna.fbcdn.n...a8&oe=5DD5F5AD
Great bike with lots of results, very reliable with good usable power, no longer a Bucket.
Right,
Well after building up my GSX250 frame with the TS125 engine I was a bit disappointed how much it weighed all up.
94 kg wet according to the scales at my local Kart track.
Time to redo this much better-er!!
So I found on TradeMe an old RG250 Gamma alloy frame and I decided to swap as much as I can off my GSXR Chassis and build my super bucket.
Parts purchased so far.
RG250 Frame
KLX300 swing arm
RM85 complete ignition setup including flywheel and CDI
KLX250 rear axle and chain adjusters
KLX250 rear brake setup
Parts I already have and will be adding to the mix
GSXR750 Ohlins rear shock
GSXR1100 rear suspension linkages
GSXR250 Front Forks
2 Sets of GSXR 250 Wheels (one with slicks fitted, others for wets)
2 XJR1200 front brake Discs (one for each wheel set)
GN250 Front Brake Master
TS125 Engine
My reasoning for using the KLX swing arm is because the TS125 engine mounts like most dirt bikes and the rear engine mount is the axle of the swing arm. I built vertical gussets on the GSXR frame and I won't be repeating that mistake 2nd time round.
The KLX had a larger diameter swing arm axle then my TS125/GSXR had so I turned some top hat spacers to adapt the KLX swingam into the RG250 frame. Width wise the KLX swing arm is perfect!!! it's like it was destined to go into an old Gamma frame. Gotta love how Suzuki (Kawasaki KLX250 = DRZ250) keep parts and dimmensions common across many models.
Moving onto rear wheel mounting.... The KLX has a much larger diameter axle than a GSXR250. I got the SKF bearing catalog out and tried to source a bearing to adapt GSXR wheels onto the KLX axle.... no joy the bearing I need doesn't exist/isn't common and I couldn't be bothered to strip down the rear wheel to get them machined out to make a bearing fit.
Plan B, I cut down the KLX axle and welded a short piece to each side cam shaped chain adjuster, RH side also catches the KLX caliper hanger, LH side only catches the swingarm and is welded to its own chain adjuster. I then turned both axle adapters on the lathe to true them and ran a 16.2mm drill bit through the centre to allow a standard GSXR250 rear axle to fit through the center. Boom GSXR rear wheel on standrd size bearings in a KLX swingarm.
I just need to center the rear wheel in the swingarm next. After some measuring I need to loose 16mm off the chain side somehow. I have purchased a FXR150 sprocket carrier as I'm hoping it will be a little narrower then a GSXR250 item. Hopefully this arrives soon and I can get the rear wheel fitted.
The GXR250 Frame, rear shock and Swingarm weighed 23.65 kg on the scales at work.
RG250 frame, KLX 300 swingarm, Ohlins rear shock 14.21 kg
9.44 kg down already!!!
I still have a few other parts I made out of steel last time I intend to redo out of alloy this time. Lets see how this all goes....
Hello all,
its been a long time since I have updated this thread.
It weighs 75kg wet!
Needless to say I'm totally stoked with how light it has ended up.
KX85 ignition setup and flywheel is all fitted and works well. The KX85 flywheel weighs around 400 grams and the TS125 flywheel it replaced weighs 900 grams (even after I lightened it on the lathe). Ignition timing is currently set at 22deg Before TDC and it runs well. Standard KX cdi appears to retard timing several degrees as the revs rise.
I also have just dug out a Trailtech Vapor dash I had left over from an oldd streetfighter project. So now I have a tacho and a shiftlight. dunno how much I need it or if I will even be able to see it while racing. But It ws just gathering dust in my shed previously so why not.
I still have a few tidying up things to get done (eg covers around ignition system on the frame) but the bike is pretty much ready to go.
See you on the track, Hopefully a mission to Tokoroa is on the cards sometime soon.
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75kg. that is very good.
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