Maintenance & Technical > KX500 Original

Newer style top end on 86 Motor?

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don46:
The cylinder and head on the older units are quite a bit bigger than the new ones, the older units had a water elbow bolted to the head going to the radiator, later units it was part of the head. pre 88 units used a nut to hold the countershaft on, 88 and on had a snap ring, but the 88 had the larger cylinder and head. Thats about all I can think of that is apparent from the outside, I guess it's one of those things you just know. Sorry I can't be more clear.

puffy:
Mine has the bolt on water fitting on the head.But its a newer bike it was nate mccoys

JBKX:

--- Quote from: don46 on April 11, 2008, 04:53:46 AM ---Junk the mikuni carb and get a Kehin, that'll help. You could put the newer ignition on with the bigger flywheel, that may help. I have a newer bottom end with an older cylinder, it starts every bit as good as the newer motors.

--- End quote ---

The Mikuni I'm running is a TM series bored to 41MM with a booster jet.  It runs very good once it is started (it's very similar to the carbs FTZ sells).  Does anyone have experiences and/or jetting tips for this type of carb on a KX500?

Also, can I put the newer ignition on and retain the larger flywheel?

don46:

--- Quote from: puffy on April 11, 2008, 10:42:04 AM ---Mine has the bolt on water fitting on the head.But its a newer bike it was nate mccoys

--- End quote ---

I don't know who nate mccoy is, but if it has the bolt on fitting it is either an older top end or somebody has modified the head, all of the newer ones (89-04) are a cast piece of the head stock. If you want to take a picture I can tell you if its newer or older.

JBKX, I'm not sure I understand what your saying, so if I don't make sense, its not intentional. The 86-89 ignition is the same, they used a smaller flywheel, way smaller. These ignitions had 5 wires coming out of the CDI and 4 out of the stator. The older flywheel is about 3 1/2" in diameter the newer one are about 4 1/2" in diameter. So if you use an older ignition you need to use the whole thing, flywheel, stator, and CDI

JBKX:

JBKX, I'm not sure I understand what your saying, so if I don't make sense, its not intentional. The 86-89 ignition is the same, they used a smaller flywheel, way smaller. These ignitions had 5 wires coming out of the CDI and 4 out of the stator. The older flywheel is about 3 1/2" in diameter the newer one are about 4 1/2" in diameter. So if you use an older ignition you need to use the whole thing, flywheel, stator, and CDI
[/quote]

I didn't make myself clear, sorry.
 
I do have everything except the CDI to switch it over to the newer style ignition system.  Is it that much better of a system to justify spending the $ to get the CDI?  If so, does anybody have a spare CDI for a good deal?

Has anyone ever ran the TM series Mikuni Flatslide carb with success?

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