DT help

[Laura]

Right help with DT needed Alex brought this dt about 4/5 months ago he heard it running and then it died. Toko petrol tank of and it was full of rust. It has been standing for about 4 months since and now has a new petrol tank on and the carbs cleaned.

The spark is fine n the bike and we have tried bumping etc, It fires but wont run.
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[Scotsman37]

Have you checked out the ignition pulse generator to see if the timing rotor is damaged or the generator coil is faulty?

[Laura]

[Scotsman37]

Is there no Haynes manual available for your bike as it will tell you how to check for this.

[Laura]

Ill ask g and dusty then.
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Good girls ride motorcycles bad girls thrash them.

[Kickstart]

Hi

That it sparks tends to suggest the ignition system is OK. Yes they can have problems but most of the time they either work or they do not. However one thing worth checking is the ignition timing, as the flywheels are located with a woodruff key and these can shear off allowing the flywheel to move a bit. Result is a healthy spark at totally the wrong time.

Beyond that I would say that a carb / fuel issue is the most likely. Clean the carb out again. Also check the reed valves are sealing correctly (easy to whip those out while the carb is off).

Also worth doing a quickly compression check. Not unknown for piston rings to strick when a bike is left standing for a while. Although this is unlikely it is an easy check to do.

All the best

Keith
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[simon1221]

I know there is a haynes manual for the 1987 - 1993 Dts and the post 1997 ones.
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[MarJay]

Could it be that the breather hose or the fuel line is blocked with rust?

If there is an air lock or part blockage somewhere, some fuel will get through and build up in the carbs. The bike will fire, but then the fuel will run out and the engine will die.

I suggest trying to clean out every tube that was ever connected to the old tank.

Also check the carbs are set up to provide enough fuel to the engine. I think there might be some sort of needle adjuster for the main jet...
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Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Whitetrash]

Replace the fuel hoses and get an In-line filter somewhere between tank and carb, have the carb off get it open and clean it, could be dirt or swarf lying around, after a clean and general check get some fresh fuel and try it again
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[Scotsman37]