Maintenance & Technical > KX500 Original
How to build an @ss whooping KX500
manco:
The 450 was the other engine I had in mind. They are a bit rarer though so I was looking at 480s which are still commonly found. Do you know about the electrical parts between the cr250 & 450. Stator & rotor are completely different between the bikes it looks like. The coils between the bikes are compatible I know. Do you know if the CDIs can swap between the 250 & 450?
I may be interested in yer motor. I guess message me if you are thinking of parting with it. I am not sure if I am ready to get into the cr project yet but who knows I guess. My shop is ridiculous right now. I got a Yamaha that always runs, two basket case dirt bikes & some misc. spares cluttering everything up. I need to cut down on the junk & get a few things ripping this winter. Maybe I'll take you up on the 450 motor when the floor clears in front of my tool box. :lol:
manco:
I will look into the vf2 reed n spacer when the engine is up again.
Interesting stuff on the CR motors. I didn't know about the stroke change.
The lighter flywheel for the KX is that the pre-1992 generator you mean or which years is lighter?
Speaking of years of engine on the CR reminded me, I wanted to ad to this thread, Would an older engine provide this performance better then a newer KIPS engine? for example an 1987 engine vs a 1998 engine.
My 98 engine I need to rebuild or replace is how I brought this thread up looking for ideas. I been seeing lately though low dollar 1987, 88 KX500 bikes with running motors. I thought about just buying one & slapping the old motor in my 98 frame for a cheap get the bike back on the dirt kind of repair. If the older 87-88 engines had certain performance advantages maybe I would consider the option of an older motor more thoroughly.
manco:
Something else I have been thinking about what I am after may not be just about about engine tuning for lower rpm HP. It might also be about shifting the rpms up in relation to the mph that bike is traveling. What I might be more after might be better described as "more HP at lower speed."
If I could shift the gearing way low to allow a lot of HP at say 5mph that is what I am after. So far I have been thinking low speed, low rpm, higher then normal HP with normal gearing. The other way to get ther at the same time may be to be thinking lower speed, higher rpm, higher hp. Only way a kx can get there would be lower gearing. I have looked so far into rear sprockets as to find anything up to 60 tooth. I am running I think 13 x 52 now. 13/52 is still to high for what I want. Bigger then 52 though and the lower rear chain guide needs modified. I already have an 18" rim. Its running a big tire so its pretty much like a 19 mx setup. I could run a low profile tire to gain a little lower gearing. I did look into various years of kx500 gearing. I don't think I rememeber any big sweeps is gear changes year to year.
One thing I have been wondering is are there any other lower geared primary gear & clutch housing sets compatible with kx500 engines? I did some looking but don't remember seeing much. Kawasaki only shows that the 89 and newer kx500 have the same primary gear & share it with the kdx250. What about kx125 or 250 primary gears? Will those swap into a KX500? Wonder what there gearing is.
RoostiusMaximus:
The CR stroke was the same 1984-01, the con rod length changed which inverted the piston speeds, spark advance taht was required, flywheel mass needed etc.
I've read what you're saying about riding slow, in reality you're chasing torque :lol:
On the CR I'm running 14/51 with the 140 M5B tire, can start on a gravel road at 1500-2000 rpm in 5th and not stall it, then roll on the throttle and blister the tire. Bike idles under 700 rpm and I've been known to ride it as low as 500 rpm.
Primary gear is written in stone on the KX. On the CR the large gear on the basket got smaller in 2009 crf450's which is the same mounting pattern, so if a crank and waterpump gear were made to compensate you could have a taller primary gear, I know its opposite of what you're hunting, but that is the only ability available.
tecate3:
here is an unfinished 84 CR500 in an 86 Tecate project:
https://seattle.craigslist.org/oly/snw/5228276522.html
If the CR500 motor fits in the Tecate then it fits in the KX500, how the sprockets line up is another question, maybe some one will ask the seller.
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