'00 Xplorer 250 lethargic- stumped!
I'm stumped, looking for some help here. Some background information for you: Last fall, I found a 2000 Xplorer 250. Thought it was a cool machine, and something that my son could learn to ride on, and could do some chores around the yard. Went and looked at it, made an offer, and took the machine home. With it being the end of the season, I took it out one time, noticed some things I wanted to work on, but ultimately winterized it and parked it until a few weeks ago.
It initially was not back shifting, so I tore the secondary apart. The buttons were worn, and the helix was scarred, so in went a new helix and buttons. Backshifting fixed. Set the clutch with the Red spring on 1 on the moveable sheave, and 2 on the helix. Did not spend any time with the primary, but did notice that it has the blue spring in it. Before final reassembly, I started it in neutral and the clutches seemed to function fine, though it did seem to take a while to get the primary to slide all the way back out completely.
I live at 4500' and took it for a ride at 6200' at 40*F on Memorial Day and the machine was very lethargic. Engine fires up quickly, only needing the choke at or below freezing for 10-20 seconds. On the trip the machine would move under its own power, but struggled getting it on the pipe, and would bog at 2/3 throttle to WOT in high range. At times it was really struggling, so I put it in low range, and it seemed to cruise around better, and would actually get into the power band, but still didn't seem to run as good as my '98 Trail Boss. Chalked it up to be jetting. Tore the carb apart tonight, and its got a 120 main, and 40 pilot which looks to match factory jetting specs for the elevation.
Pulled the plug to do a compression test, the plug is black, and has a lot of carbon build up on it. Did the compression test and got between 95-110 PSI depending on 1 of 3 gauges used.
Not sure where to go next. Would low compression manifest itself more at elevation? What else should I look for?
Last edited by 04Preddy; 05-28-2019 at 07:18 PM.