Maintenance & Technical > KX250 / KX125
flywheel weights
eprovenzano:
I do mainly trail riding, and was wondering if anyone was using a flywheel weight. If so what size, and what did it do for you?
I'm looking for more low-end power. When I purchased the bike it came with a PC pipe and PC silencer. I do have the original pipe and silencer, and was thinking about trying them just to see what the difference would be. I'm also thinking of changing the sprockets, dropping a tooth on the front, and adding 1-2 on the rear.
Any advice would be appreciated.
01KX5WOODSRIDER:
I have a 96 Kx-250 with stock flywheel that i trail ride also. I used to have a 91 Kx-250 that had a Stealy weight on it. Basically the extra weight will keep it from stalling as easy at low rpm and keeps it from spinning the rear tire as easy when the power band hits. I think the GNCC guys run around 8-10 ounces of extra weight on their 2 strokes.
I would try adding 1 or 2 teeth to rear sprocket first. I'm running a 50t
sprocket on my 96 now and it helped the hill climbing noticeably. Dropping the countershaft a tooth will lower gearing a lot. I guess if you
do a lot of steep hills that might be the way to go also.
Timbowe:
The P.C. pipe will probably rob you of low end. They are more of a peaky type m/x race setup. Try a FMF Gnarly, which will give you a good strong bottom end. Tradeoff is a slight loss of top end, but if your trailing it, its not gonna matter. Team the pipe with a VForce reed block for even more off a bottom end hit. You'll be sorted!
Spider:
I have an FMF Gnarly, VForce, Moose Spacer, Stealthy 16oz, and a Kenda Millville on a K5. The thing is a tractor!
My buddy on the other hand has a YZ 250 with a PC pipe VForce and Moose Spacer. That thing has a bundle of mid-range to top end but suffered on the bottom. He lives for weelies and wot, but is considering a stealthy for the woods because the excess weelspin is tearing the knobs off his tires, we have lots of roots. The tires really are a pain more than an expense cause my woman works with a guy whose kids race and gives her their old tires. A good tip for you guys who don't mind slightly worn tires for cheap.
Dale
eprovenzano:
The reason I'm asking is I do a variety of riding types. For example back in mid November I went with a group to a local track. (This track had 2 full size MX tracks, one for the little kids, not to mention 400 acreages of trails.) I had a ball "pretending" to be and MX star... I then went riding with a friend through the wood. The week prior to our ride, a hare scramble was at this facility, so all of the markers were still up. Unfortunately after riding the track for several hours, I was pretty tired, and my friend races GNCC events. After about an hour, I told him to go do his thing and I'd see him back at the pits... (He was just tooooo quick through the woods.)
The following weekend I went with a different group (all quads) except for me on a 20-mile ride. The trails were ruff, very ruff. Even the detours around the deep stuff were very difficult. At one point we had to winch a 4-wheel drive out of the mud. The trails probably have not been used in years. I think I made it into 2nd gear twice in the trails, and up to 5th once on an open road.
Because I ride such a variety of terrain, I'm thinking of playing with the gearing. I?m planning on adding 2 teeth to the rear anyway. But if I know I'm going to the track/trails, I'd go with standard gearing, and If I know I'm going to be trail busting with quads, swap the front sprocket for one with one less tooth. I've never added weight to the flywheel, so I was wondering about the effect.
Any and all info greatly appreciated.
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