erikrs

Well I spoke to the guy of the trialdemoteam last sunday. Apparently the problem is lateral play on the clutch housing, so the platepackage doesn't move enough, since the housing is partly moving with it. As a practical solution they usually stack 3 metal- and then 3 fibrecoated-plates in the pack, instead of the normal procedure (1 metal, 1 fibre a.s.o.). The other solution being of course getting rid of the play, but that's a more serious operation. I will try this trick and let you know the outcome. I just started, but this trial virus is really on me now, so I will, without doubt, know all the ins and outs of the bike in a short time. But before my next ride I will first go out and buy some proper gear, especially boots, since I already hurt my leg badly slipping of the kickstarter in the rain Jumped my first pipe though (on my second time on a trial's bike). Me happy

Cheers Jon, I'll speak to some more GG-riders in the near future to see what their opinion is on your theory. I'm not completely unskilled in spannering and mechanics and have found everything in order as for now. And it's not a very complicated system First I'll do some more riding now

Checked it all again: Ball between the 2 pushrods is present. There would be no pressure at all if that 's not there, I take it, since it's a 5 mm ball and the travel I measured is about 1,5 mm. The slave piston looks good and the ball inside dooesn't look to have moved (I see no marks at the piston at the counterside), but I must see if I can get hold of a new one to measure the distance from the flat side to the top of the ball (4,4 mm now). On the other hand, if that were the problem, shimming the thrust bearing should have had effect also. I will replace the piston's o-rings tomorrow, since one isn't so fresh anymore. I doubt that that is the problem, since there were no traces of leakage and I felt no loss of pressure testing it with the clamp. At least it's better when it's warm. I took the bike out last friday for abt. an hour and a half, so it really got warmed up and the dragging was less (but still present) then. To be continued

Hi Peter, Thanks for the reply. I'll check the slave cilinder. Needle bearing in the end housing is ok (I even tried shimming that a little bit). Plates are in perfect condition as mentioned, and would cause slipping instead of drag if they'd be worn. Hope to find the problem, since the bike runs nice and smoothly and this is the only thing that takes out the fun a bit I'll keep you posted

Well I'm back again and baffled. The clutchplates are flat, the fibre ones measure all evenly abt. 2.34 mm, spring lengths are equal, travel of the end housing is 1,5 mm, evenly spreaded (measured in 4 places). The master cilinder bore looks fine and the package is strong enough for the slave to bend open a forged Bessey clamp, without any feelable falling of the pressure. Still the drag stays I'm running out of ideas Next week I'll attend a workshop with a guy who has been running GG-bikes for quite a while. I'll talk to him, maybe he has an idea Well draggin' or not, I'm off to a little playground

I just got myself a '99 txt 270 and have the same clutch drag problem. I asked the GasGas importer in Holland what oil to use and they advised a Putoline ATF. When I looked this up it proved to be a Dextron II spec. That's lucky since it's a GM spec and the same goed into the automatic gearbox of my Chevy van , so it was on the shelf. I cleaned the clutch-plates, changed the oil and the drag stayed I refreshed the hydraulic fluid and the drag stayed. Tonight I experimented with shimming the end pressure bearing and the result was that the "gripping-moment" changed accordingly, but the drag stayed Tomorrow I will check the flatness of the plates and if there is something amiss in the hydraulic system. I will keep you posted and if anybody has an idea where this problem comes from, I 'd love to hear it. It's not so that I don't want to invest in a fresh set of plates, but I'd like to know if they really are the problem, since I'm not convinced of that (they look brandnew, but measurements will have to confirm that). Is there anybody with a service manual that could give me the numbers to measure (clutch plate thickness/tolerances, traveling distance of the slave cilinder's piston a.s.o.). I've been trying already to get a service manual, but apparantly '99 is obsolete and not on the downloadlist of GasGas anymore

As the topic says already, I'm a newbee to trials, but not to bikes. I just bought myself a '99 GasGas txt270 to try to learn the basics of trials. I got infected by a friend who's into this sport for about 20 years now As for the moment I'll mostly be doing reading and learning, though I might come up with some technical questions, since I do not know the ins and outs of the bike yet. There is a proper chance by the way, that this winter the GasGas will get a third wheel, since the "three wheel fever" has been running through my veins for over 2 decades and that way my better half could participate in the sport