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what do you mean by not having the baffles on ??
If you ran the engine without water feed to the waterpump then you will have melted the impellor and overheated the pistons and might have damaged the bores etc !?
Check the compressions and they need to be no less than 100psi each, the impellor and housing and the pipe up to the engine must be checked ! You can run the engine without the gearbox fitted by connecting the water hose to the pipe once all checked ! Any more info u need contact me !
Check with the friendly man behind the parts counter at your Suzuki dealership. Slip him a couple bucks for good advice. Make a friend get GREAT information.
It seems there is too much of fuel going into the non firing cylinder thus the blackish spark plug, recheck the float level to that carburater and also check the valve clearance.
Your bike is running lean (too much air and not enough fuel). What, if any, modifications have you done to the bike? If you changed the exhaust out for louder pipes, you need to adjust the f/a (fuel/air) mixture in the carburetor to compensate for more air going through the bike. Let me know here if you have made any type of mods to the bike.
Check valve clearance, as vlaves wear the gap closes, most riders don't bother to adjust them till they have a problem like this.... By the way the valve may be part of the issue for backfiring while deccerating but Pipes cause this.
there will probably be a couple or rivets close to the end of the muffler. drill out or chop off with a chisel. pull out baffles. but beware it will be loud. i did this to my dragstar/v star and ended up putting them back. you could just remove some of the fiberglass packing from the baffles, the cops will give you sh*t if you run straight thru. aftermarket pipes would be the real way to go, you may need to re-jet the carbs though. my bike also lost power with no baffles as engines need back pressure and all pipes are designed to give this.
hope this helps
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