The rear axle spacer swap is only little more involved than removing the rear wheel.
Just for giggles, grab the rear pulley at 3 and 9 o’clock and see if it rocks back and forth.

To answer your question, changing the front sprocket is probably the easiest way to reduce rpms at higher speeds.  Go for it!

Personally, cruising at anything over 65mph on this bike feels unnerving.  It feels like it’s gunna blow up, get death wobbles, or the vibration is gunna make the bike fall apart.  Add a little wind and funky road contour, and who knows where you’ll end up.

Anyone got a pulley they would like to sell?

JRM wrote on 07/08/26 at 00:29:57:


Yes the stock rear pulley and belt are used...the change is noticeable and makes the engine rpm more pleasant at speed.

The only 2 folks that made these for sale was Armen and me.  We have both stopped doing it as it involves a lot of work - and we are both retired!

The work involved watching eBay for a good used EN500 pulley, buying it, de-greasing and cleaning the pulley, machining the pulley, powder coating, listing the pulley for sale, arranging for payment, packing up for shipment, a trip to the Post Office, etc.  For me it was nearly 3 hours of work for each pulley.  The project also included sharpening my lathe tools, buying new screws and the pulley lock tab to include with the sale, and the powder coating materials.

While I was busy working on these pulleys - nobody was working on my household chores or garage related projects.

If you can find a good pulley and a local machine shop, they could cut the pulley for you.