Suzuki gp100. Storage for 10 years

Stuwickwar · Derestricted Danger Joined: 29 Oct 2013 Karma :

Hi new to this. I have just acquired a gp100 1982. I've serviced the bike changed the spark plug and stripped down and cleaned the car. For the first time it has started today. After starting it slowly drops the revs and cuts out. Any ideas why it does this? Is there a chance the carb needs setting correctly and does anyone know how to do this? Thanks. Stu.

Hetzer · Super Spammer Joined: 19 Feb 2007 Karma :

Is the battery fully charged? Is it holding a charge? There may not be sufficient power from the alternator to maintain a spark if the battery is flat/not charging.

Then is there gunk in the carbs? Gunkage could be moving from non-obstruction to obstruction when the engine runs.
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Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Clean the carb properly. Your idle/mixture circuit is clogged.

Wind the mixture screw in, counting how many turns until it stops. Write down how many turns (probably 2.5). Undo it, blast in some carb cleaner using the nozzle, refit the mixture screw in its original position.

pepperami · Super Spammer Joined: 17 Jan 2010 Karma :

Haynes manual is your friend Thumbs Up

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misscrabstick · Crazy Courier Joined: 05 Jul 2013 Karma :

An 82 GP will not even need a battery to spark, I would think you need to adjust the carb a little assuming it is properly all cleaned out, warm it up thoroughly then locate the mixture screw and tweak it in or out until you get the smoothest fastest idle you can, you may need to use the idle speed screw to get the speed correct after adjusting the mixture.

symonh2000 · Crazy Courier Joined: 20 Feb 2005 Karma :

Like the others have said, it probably just needs the carb cleaning out. I would also replace the air filter and then take it for an "Italian tune-up" which is basically a thrash up the road to clear all the cobwebs out.
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Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

Check the tank vent for dead spiders.
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bypass2 · Spanner Monkey Joined: 12 Sep 2013 Karma :

any old petrol in the tank if so clean the tank. petrol tap. carb . get fresh petrol. will run without a battery.

bladerunner · World Chat Champion Joined: 09 Sep 2006 Karma :

Indeed no battery needed on the gp 100. Maybe run a litre of fresh pre mix thru it to wet the seals etc and get some fresh oil around the bearings .....pull the fuel pipe off the tank and make sure you have you have a good flow of fresh fuel....failing that...did you take all the jets and emulsion tube out of the carb and give them a proper clean?
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