Question about 1980 Suzuki Gs 550 L
I just bought a 1980 suzuki GS550E and already running into problems.
First it doesnt want to start up on its own but when it does it runs fine.
Second two of the cylinders seem to be running lean. Hooked up my meter and two were running at the 350 degrees F and the other two were about 90-100 degrees. Do they just have to be adjusted? If so do i set the vacuum on the carbs and what would the spec usually be?
Third the battery seems to lose its charge alot. I hooked up a DVOM the the battery while it was running and it was reading 11.75 volts. Is this a normal reading or does the charging system seem like its not working?
If anyone can help, it is greatly appreciated. Im just trying to get this bike in the road soon.
First thing I would do is change the battery and spark plugs. start there.
Posted on May 24, 2009
Hello elementfreak...First thing you need to do is run a compression check on all cylinders...readings should be within 10-15 psi max of each other. Next, check for vacuum leaks, a cracked hose, faulty carb boot, or any slight leak will cause a lean condition and hard starting...The choke and pilot circuits share passageways. When pilot jets become obstructed, the choke circuit compensates and allows engine to start and idle with choke, but stalls without choke. If the bike has had the same gas in it for over 6 weeks, "varnish" is possible in the system...Purchase a can of "Seafoam" at your local parts store, pour 1/2 of in a full tank of gas, and the other 1/2 in 2nd tank of gas, after you use the 2nd treated tank of fuel...replace fuel filter.
This stuff works better than anything the dealers sale.
A carb sync tool for mutiple cylinders engines will be needed to sync carbs, this is done after all other problems are corrected. If your bikes exhaust or air intake system has been modified from stock...The air-fuel mixtures will need to adjusted by selecting the correct jetting (carbs need jetted).
Tuning is not easy and often requires a wide selection of air, main, and pilot jets, jet needles and needle jets.
11.75 volts is not a fullly charged battery, 12.2 to 12.6 volts is.
A low voltage battery will create hard starting, and poor spark. Faulty ground cable terminals are common, check the main ground at frame. Trickle charge the battery over night to a full charge and test, replace if needed. The stator/rectifer systems on these older bikes won't indicate enough amperage return untill the engine RPM is 3000 and above..Check the connectors for corrision....
Hope this helps and gives you a place to start...Good Luck
Ride safe and ride smart...
Posted on May 24, 2009
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Posted on Jan 02, 2017
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