Has anyone tried to "detune" a Gas Gas 250? I am looking for a 160 or 200 for my kid......
hard to find, got to wondering about toning down a 25...lots of them around. Would a couple head gskts work? Retarded timing perhaps? Please let me know if I am dreaming.
Craig

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From: "Jim Zigan" (jzigan "at" seidata.com)

You are actually right on track! You can make the motor as "soft" as you want with that kind of cheap modification. Then as you son progresses, you can crank things back to original. The last time I did that to a bike was on an air cooled, so the water cooled head may require some high temp RTV when stacking head gaskets. If that makes you nervous, you can make your own head gasket out of sheet copper. Any soft copper will work. A big hardware store usually has it for roofing etc. If you don't have a punch for making holes in the copper, try squashing the copper between a backing board, and a top layer of Lexan. You can see where to drill though the clear plastic, but it will hold it down. Copper is real bad about wrapping up the drill bit.

Jim

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> From: Byron Okubo (orthodoc "at" uswest.net)
> The easiest way to soften up the motor is to retard the timing. Just
> rotate the timing plate clock wise as far as it goes. This slows down
> how fast the bike rev's, smoothes out the engine quite a bit and made it
> easier to kick over.

From: Eric Murray

Makes it harder to stall too. You also might be able to get a flwheel weight for the Gas-Gas, which will slow the motor down still more and make it easier to ride.

> I did this to my Gasser to help me make the switch
> from a TY350. ...still managed to go over the bars with too much
> regularity. I would recommend marking the preset position before moving
> the plate. The flywheel puller is a 26mm x 1.5 It fits Motoplat, Bosch,
> Femsa. Husky all late models CDI Motoplat, KTM all large flywheel
> except external rotor Motoplat and all early Bultaco's back to 1963. The
> one I found was made by Dennis Stubblefield sales Capistrano Beach,CA
> Part number MP#12. The puller was a little hard to find locally so I've
> provided some additional information that was on the packaging.

With the diameter and thread info you can get the correct puller from any motorcycle shop which is willing to take the time to look it up in the Tucker/Rocky catalog.

Beware asking for a "Motorplat puller"- there's at least four different ones!

Eric.