So I talked my buddy into buying a 80 xs11 and 36 hours later, bad news. He got it home yesterday at noon, I went over to admire his purchace, went to get fluids and some seafoam, applied a boost and it was alive. A little sputtering and a few pops and backfies until it was warmed up, then it ran like a champ.
Now, as was mentioned, you didn't say what condition the bike he got was in, but being in CANADA, it may have sat for at least the winter if not longer, hence your need to get Seafoam and "fluids". These bikes ARE reliable once they have received the proper maintenance, and a dash sea foam and changing the engine oil isn't anywhere near enough, especially with a bike that has sat for any length of time!
You've received troubleshooting info regarding the electrical system, does sound like a weak battery and or/also charging system, but if the grounds...not just the one at the battery to frame, but the other at the bottom/back of the engine to the frame are not conducting it won't charge properly anyways. Also, the collection of wires that are bolted to the Reg/Rect under the gastank, as well as the reg/rect body to frame contact also, plenty of places for corrosion. Also check the large white plugs BEHIND the fuseblock panel which are the ALT plugs to the harness, again corrosion, can get hot and melt!!! And replace the OEM Glass fuses if present with solid Atco style, I know where you can get a decent fuseholder! See For Sale forum, Parts, Sticky thread parts/services by members..scroll down you'll see it, no extra charge to Canada!
Next, please read or have him read the tech tips regarding the cam chain tensioner adjustment procedure and proceed to perform that slowly and carefully. The end cap can be sealed with a variety of techniques, a temporary one for now, then you can order the replacement plug for the proper repair. FOLKS here will tell you/him to get an AUTOmatic tensioner, but IF the OEM hasn't been damaged(overtightened and threads stripped) it will still work properly.
There's a thread in the MISC forum that will tell him what to look for in a neglected XS11 and that should be addressed before any amount of riding to bring the bike back into proper reliable and safe condition!
T.C.
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