markkeen123 Posted April 20, 2008 Report Share Posted April 20, 2008 i have a gas gas 280 pro and left a message in the gasgas forum but no one is replying http://www.trialscentral.com/forums/index....view=getnewpost i basicly need to know things to look out for in the transmission and clutch parts.If you read my other thred you will have an idear what happend stripping bike on monday or tuesday waiting for a flywheel puller from a mate of mine just in case i need the transmission needs to come apart any help is usefull thanks from mark Quote Link to comment Share on other sites More sharing options...
peterb Posted April 20, 2008 Report Share Posted April 20, 2008 Hi Markkeen, Not such an easy one to diagnose. Your bike is a PRO, as you were riding, it jumped out of gear, locked up and made a grinding noise. Does the motor turn over? - if yes, then does it start up? If not starting then the flywheel key may have sheared. Check with your mates puller. Can you select any gears? If none, or not all of them, you'll need to strip off the clutch cover, leave the water pump hoses on for now. The clutch unit is held in by a central 5mm allen screw, with a vent hole all the way through. Do not use a ball end allen key to undo this. Before undoing, tap with a drift to shock the threads a little then use a flat end allen key. The clutch then pulls off in one unit. Have a look underneath for possible damage, maybe the kickstart quadrant or idler gear. Check the gear lever return spring sited below the clutch - is everything here working properly? If nothing wrong so far, then you'll need to investigate further in the motor, complete stripdown, drain coolant, oil, remove head and barrel as one unit unless you are replacing the head O rings. Motor splits very easily. Good luck, PeterB. Quote Link to comment Share on other sites More sharing options...
copemech Posted April 21, 2008 Report Share Posted April 21, 2008 Your gears may be knackered, had this happen to one of the local kids this year. If you do not see anything wrong on the clutch side, well? Not sure what broke, the motor was sent off to GG usa. Quote Link to comment Share on other sites More sharing options...
jse Posted April 21, 2008 Report Share Posted April 21, 2008 i have a gas gas 280 pro and left a message in the gasgas forum but no one is replying http://www.trialscentral.com/forums/index....view=getnewpost i basicly need to know things to look out for in the transmission and clutch parts.If you read my other thred you will have an idear what happend stripping bike on monday or tuesday waiting for a flywheel puller from a mate of mine just in case i need the transmission needs to come apart any help is usefull thanks from mark Probably the best advice I can give you about transmission work is you can never be too careful. Keep both gearsets complete until you are ready to work on them (and only work on one at a time) and arrange the parts lengthwise on a clean shop towel in EXACTLY the way they came off the shafts, especially the spacers/washers/circlips. Another common mistake I see is that a mechanic will find a knackered roller bearing in a transmission and think that just replacing that bearing will make things whole again. The Pro transmission has, for instance, two split-caged roller bearings, but they are actually only 1/3rd of the "bearing", as the shaft is the inside race of that bearing and the inside of the gear cluster is the outside race. If you just replace the roller cages and the gear/shaft surfaces are compromised in any way (they almost always will be), that bearing will soon fail and you'll be right back where you started. If a roller bearing is munched, you will usually be better off in the long run to replace the whole "unit" of bearing surfaces. Jon Quote Link to comment Share on other sites More sharing options...
markkeen123 Posted April 21, 2008 Author Report Share Posted April 21, 2008 the wheel didnt lock up it just started to make a hell of a racket so i turnd the engine of QUICK i can select all the gears shifting up and down.it sounds like there is something rattaling around the engine like a part of a gear or a washer/ spring or some thing i will be very carefull when stripping. FOUND THIS WEB SITE http://d-mis-web.ana.bris.ac.uk/personal/H...f/media/gasgas/ seems to be great have a look tells you alot about the pro Quote Link to comment Share on other sites More sharing options...
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