CR250R Keihin PWK/mikuni carb swap questions

[oppenheimer77us]

Hello all, finally got around to ordering a PWK airstryker from JD for my 2006 CR250R and upon examining the carb the one they sent is the 91mm carb (front to back), not the 75mm carb like the stock Mikuni. My question is will this work anyway and is the longer carb better for performance? Can I swap out the airboot from an earlier CR (like a 2002/3) that runs the 91mm carb or can I squeeze the extra 16mm of carb in there? Should I return it and find a 75mm Keihin? Any help would be appreciated, TIA.

[dogger315]

Yes, the TMX is a short body and this version of the PWK a long body, but this is a common swap and the boot can be fitted with a
bit of wrestling.  If you want a easier fit, you can swap your current boot with a 2000 CR250 model and it will be the right length
since that bike came with the same PWK.  Air boots are cheap and readily available from Honda.

dogger

[oppenheimer77us]

Thanks Dogger, Yea that 2000 model boot is only about $26 but I am going to try and install the keihin with the stock parts and see how it goes. Are there any tricks to disconnecting the TPS? I was thinking just disconnect and wrap with black tape. Thanks again -Mike

[dogger315]

Are there any tricks to disconnecting the TPS?

If you think you might sell the bike someday and decide to keep the TMX so
that it can be re-installed, leave the wire in place.  I like to fold the wire on
itself then cover the whole thing with some heat shrink tubing to protect
the terminal.  Use a zip tie to secure the bundled wire.  Electrical tape will
work fine, just keep an eye on it.

If you know you won't ever use the wire again, cut it short and cover the end
with a  terminal end heat shrink boot to keep the elements out.

dogger

[luthier269]

I have a 2005 and I just unpluged the TSP from the plug on the frame and left it that way with no problems.

[oppenheimer77us]

Thanks again, yea I like to keep the old parts and would like to keep the connection nice, shrink tube is a great idea.