Join Date: Jun 2010
Location: Hoffman Estates, IL, USA
85 K100RT Running & Electrical Problem
I have an 85K100RT (one owner-36K miles) new to me 2 years ago. It had been sitting for years. My bro-in-law got it going, professionally painted it and it became mine. Had a BMW independent shop go through it just after purchase and everything was fine except a faint glow in the alt. light (kinda normal). It stranded me once with a clogged fuel filter, but other than that all good.
Haven't ridden it much since last July and am trying to get it going again. Last July issue was similar to the clogged fuel filter. The bike had gotten really low on fuel, after I filled it up it would not restart. Waited and tried, waited and tried, finally turned over but ran really rough - got some techron inj. cleaner into it and road the 200 miles home the next day. Bike would not idle well and starting was questionable.
Pulled the filter and fuel pump. The screen had become detached from the fuel pump, filter may be and issue, so replaced the filter and pump. Used a vacumn pump to clear what little debrie that was in the pump sump out. s/b all good, but still would not start, starter stuck on, pulled the ground to stop it and replaced the relay then charged the battery. Starter sticks on again, crack green starter knob, replace relay, charge battery (yuasa 1 yr old). Starter sticks on again, replace relay, battery, right hand bar switches, fresh fuel.
Bike starts, but idle a little dicey, alt light glows, glows brighter on and off when revs up. Bike dies, restart and idles like crap, dies, starter stuck on.....
Go through the bike and clean all electrical contacts (thx don e.) Take the starter apart and clean the carbon out (thx). Replace the plugs with OEM (old ones-NGK-not bad). Check starter relay with continuity tester - not frozen, but may have freed up when contacts cleaned.
So, before I put the tank back on - is there anything else to check? I really like this bike and at this point have about $4K invested between purchase, go-through and this adventure, so thinking keeper if it will just run.