Maintenance & Technical > KX500 Original
Buying a new carburetor. Which one?
sandblaster:
--- Quote from: 68Fastback on August 02, 2017, 02:40:16 PM ---I found a 38mm AS for sale locally but it is the "short" version. While I would love a ahorter airhorn for removal reasons im woried my airbox might not reach it or maybe pull loose while riding if i have to strech it.
--- End quote ---
Add a 10mm reed spacer :-) Even more torque
sandblaster:
--- Quote from: 1980mcneil on August 02, 2017, 12:57:03 PM ---I think I'm going to buy the air Striker from JD jetting. Your article mentions blocking off some of the ports or vents of the newer air Striker?
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You do not need to block anything off for the standard body Air Striker.
You only need to block things off if you are using one that uses a Solenoid or a throttle position sensor..
1980mcneil:
What do you guys think about the smart carb vs the airstriker? Assume money isn't an issue. I guess my question is does the SC perform as advertised? By that I mean install and forget and at least as good as performance as stock? I saw some Dyno numbers online and they showed pretty much all five carbs being tested on a 250 were within 1hp of each other. If that is the case and I never have to jet again it's worth an extra$100
sandblaster:
As far as jetting goes, I have heard that it performs at all altitudes as specified.
I have never ran one personally but a lot of guys like them for the snow bikes due to high altitude operation.
1980mcneil:
So I ended up picking up the smartcarb. I have to say first impressions are amazing. Hike fired right up and even though my top end was worn out and I was only getting about 90 PSI compression. The bike already ran fantastic compared to the stock. I fully admit I'm no jetting expert so a lot of my problems could have been user error but really I wasn't looking for any sort of incredible power. Pretty much ran stock settings and really struggled to get the bike to both idle and not surge like crazy. I installed the smartcarb and the bike purred like a kitten and the surging problem that is been plaguing me for months is gone. Maybe it was my jetting, maybe the carburetor was worn out. I'm not sure but it's fixed now. I imagine it'll run even stronger when I get my new top-end installed. That's my bike is for trail riding only. I went with the 38mm cast if anybody's interested or had thoughts of getting one. As far as altitude and temperature changes. About two thousand feet of Varian elevation and about 20 degrees in temperature with no further adjustments needed. So far so good. We'll see What happens when trepanier's really drop this fall. But so far I'm a Believer
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