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View Full Version : Maint. idea's for the cbr1100xx

Sweetruss
11-13-2007, 10:55 AM
My bike sat in the garage for about a week or 10 days without running, just on the battery tender. I went to start it up to let it run and it did this really weird thing. It made a pop sound under the gas tank like it backfired but instead of coming out of the exhaust pipe, it was where the spark plugs are at. It sounded like something "hit the bottom of the gas tank or some pressure. Any ideas on what it might have been? could the injectors be flooded with fuel and it backfired somehow. I don't know crap about motorcycle engines but I'm trying to learn.
thehammer69
11-13-2007, 01:37 PM
sounds like you injectors "leaked" out the pintles while sitting and backfired the pooled fuel when starting. The sound would either be the pressure wave exiting the airbox, or you blew the top off of it, or you blew the airbox loose from the throttle bodys.

Hammer
SUM650
11-13-2007, 04:40 PM
sounds like you injectors "leaked" out the pintles while sitting and backfired the pooled fuel when starting.

I totally disagree! To me it sounds like your injectors "slightly leaked" pintles while sitting and backfired the pooled fuel when starting. So don't listen to Hammer. BTW what the hell is a pintles? :shrug:

One more thing in case you hadn't noticed Hammer is the official motorhead Q&A guru here for sure.
Professor Fate
11-13-2007, 07:03 PM
"what the hell is a pintles?"
Remember that story of the little Dutch boy and the dike?What he did with his finger? His finger basically was a pintle valve in a hole. Personally would liked the story if was about a dyke instead. :smilebig:
Have you pulled the tank yet and checked all hoses? When she burped she might of blew a hose off. Drain the fuel! I seen old and not so old gas do some weird shit.
DK
11-14-2007, 10:34 AM
The noise from under the tank may have been one of the rubber plugs fyling off from the backfire pressure in the air box. Lift the tank and have a peak in there.
MrDude_1
11-14-2007, 11:05 AM
BTW what the hell is a pintles? :shrug:


its the pin part of the valve in a fuel injector.

know your typical gun style garden hose spray nozzle?
if you look at it carefully, you'll notice theres a center pin in the end, that gets pulled back whenever you squeeze the trigger..

most fuel injectors work in a similar way.