lemur

Would it work if you fitted fatter o-rings onto the existing piston? ... more of a bush fix but o-rings do come in different sizes and all you need is a fit that seals without sticking.

... if you do sand friction plates or steels, make sure your sand or emery paper is on a very flat surface.

Water evaporates, take them out, dry plates in the sun and give them a light sanding if they look glazed.

Hydraulic clutch should never be a hard pull at the lever, something inside there must be coming up solid tight. If there was air in the hydraulics it would feel like mush at the lever and your clutch would mostly drag. Chances of you having worn out the clutch in one year is slim to nil and a worn clutch won't hold power, it just slips. Plus one on checking your master and slave cylinders for damage to the rubber seals and o-rings. Physically inspect the friction plates to make sure none of the corks have folded or peeled off and doubled up, plus make sure the spaces between the cork friction pads are free of debris and your fluid levels correct. What's all the brown on the clutch parts is that rust? Water in your transmission oil will promote rust and swell the friction pads more than oil thereby reducing the clutch movement.

Plus your insurance broker, even in WA state you can't road plate a vehicle without insurance coverage in place first.

You must live on an island. Any motorbike shop in Canada buys you nothing when you are shopping for trials bikes and parts 😆 & we obviously live in completely different parts of the planet where distance has a completely different meaning. 30 minutes drive for me is a trip to the dump or the nearest gas station and my trials bike importer has a showroom I have never seen because it's 4500 Km and 40+ hours drive away. So ya, my dealer that lives 4 hours away and sells out of his truck at events is by far my best option.

Google up: "gasgas motoplat wiring diagram" Yellow wire powers your 12VDC accessories and has a resistance value of 1K ohms, the black 45 ohms and blue 35 ohms. Ignition coil should read 1.5 ohms Rectifier and regulator are for the 12 VDC accessories including the fan.

Maybe we just have better dealer support 😎

😆 Only in Canada you say. Didn't know it was special, next event I'll take pictures 😎

Wiring diagram is always the best place to start. http://ossa.2y.net/ossa/onlinemanuals/ossa5speedmanual/Page124.jpg

What a shame you would need to run bias ply tires just to satisfy a DOT rule, radials are one of the best ever upgrades on a trials bike.

Problem #1 Instead of saying DOT approved on your tires it says " In USA and Canada for off road use only "

It's a 2-stroke engine, if the crank case is not sealed from atmospheric pressure your engine would not operate.

Before video we used service manuals 👍

Yes very lucky, I have access to all the parts that my dealer brings with him to events, plus new tires, boots and helmets. Jitsie helmets to be exact 👍

First off we have no idea what part of the world you live in so your availability to procure old gasgas parts is difficult to predict. Your front disc brake has 2 pistons, after Y2K 4 piston brakes became the industry standard and 4 pots offer noticeably better performance. Top end is part of it but from what I've seen with gasgas over the years, the main bearing seals are another item that may well require replacement. As previously; how easy does the bike cold or hot start? <- That is possibly the most important indicator of the bikes current health and worth.

I bet it's a JTX270 from 1997 but you could tell a lot more if you could see the rest of it, front brake is candidate for upgrade, does it start easy and run good 👍 that's the main thing. Compression test is always a good way to start evaluating an engines condition if that is an option.

Probably not. Jitsie is a unique and new company, they specialize in online trials bicycle and trials motorcycle parts and accessories because prior to their start up nothing like Jitsie existed. Store front operations don't normally promote online inventories because they have their money invested in a store front. Most trials bike dealers that operate in rural areas work out of a van, trailer or truck so they can have their inventory mobile and available at events. If you are at an event and break something a dealer might even have what you need when you need it, if the business model is online shopping you would be waiting for parts to be delivered after the event and subject to additional shipping costs.

... remove the rear shocks and move the swing-arm through its entire travel, if the rear brake actuator lever moves (brake applies) when the suspension moves through its travel then the brake needs rework. Would not be a problem if the rear brake was cable actuated.

Looks ridable to me except for maybe the brakes, I think if the engine runs decent I would just sort out the brakes and ride it 😎

Basically, your 75W90 gear oil will be a little thicker at cold temperatures then recommended by the manufacturer. Personally I would be using ISO 46 UDT hydraulic oil because then my clutch won't drag even at cooler operating temps.

Different types of lubricants use different scales: ... when you see 2 numbers divided by the W that indicates an SAE multi-grade blended oil, like you would need if you were accommodating a wide operating temperature range.

It's a little simpler then that; All 2-stroke engines need main bearing seals to function. Crankcase on a 2-stroke engine is used to force air and gas mixture through the engine via vacuum or positive pressure differentials, if the 2-stroke crankcase was not sealed on at least one side of a main bearing the engine would not function because air pressure differentials caused by the movement of the piston would leak past the crankshaft bearing. A crankshaft roller main bearing will be open to whatever side it receives lubrication from, be that via lubrication in an adjacent transmission case or via oil pre-mixed in the air/fuel mixture.

Curious, does the front brake calliper fit the rear brake mount? That would greatly simplify replacement.

The riders that you would be competing with are the ones you will learn the skills from and competition motivates you to learn and apply those skills. Best thing I ever did was start amateur trials competition and the skills didn't significantly develop until after that happened. It's too easy to never challenge yourself or to find reasons not to ride, riding with others that have the same interest is the best motivation. Riding with better riders makes you ride better.