Dropped Bike Now Loss of Power & Engine Cuts Out

cleggy92 · Derestricted Danger Joined: 18 Dec 2015 Karma :

Hi guys, bought myself a GSF600 Y the other day and on my first outing everything was going fine, it would accelerate extremely fast, I was sliding off the seat at times, and this is with a restrictor fitted!

Sadly on my way home I went to do a u-turn on a slight incline and dropped the bike on its right side, it was laying with the seat facing down the hill, so that's beyond a 90 degrees! Anyway the brake lever snapped but it was also cutting out constantly and had a severe lack of power, it revs very low by default, even after warming up. I've looked around on the internet and people have mentioned the electrics have been affected during a loss of power, but all my lights and indicators seem fine.

I feel as though dropping it has had oil or fuel or god knows what else go somewhere its not supposed to be, and that's the reason for the dip in power (its very noticeable, feels like I'm riding a 125!) . So what I'm hoping for is somebody can tell me a) what may be affected (eg. fuel in air filer) and b) how difficult it would be to check and sort myself? I'm not asking for a step by step guide of course, but if you give me the correct terminology for each possible issue I can google how to get to those places and clean / replace them. As I'm not exactly experienced doing anything more than changing spark plugs and such.

Thanks in advance!

Louis

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

you said it damage the front brake lever, have you check the brakes aren't stuck on?
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cleggy92 · Derestricted Danger Joined: 18 Dec 2015 Karma :

talkToTheHat · World Chat Champion Joined: 21 Feb 2012 Karma :

There's a drain for the airbox, look for a plugged hose that exits underneath the bike near the oil level window. See what comes out.

Look in tank, check uou have fuel.

Check engine cases for damage.

Turn fuel tap to prime, if you have emptied a carb it might need refilling manually.

Check spark plug caps all on securely, check you have a spark to all plugs, visually check wiring loom for damage. Take tank off, visual inspection of top of engine and loom, check air filter. Check oil level.

Is one or more of your exhaust headers cooler than the rest? Use spit or water spray not your fingers.
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Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

talkToTheHat · World Chat Champion Joined: 21 Feb 2012 Karma :

At least use the hair on the back of your fingers rather than grabbing headers with fingers. Yeah it's a laff to watch a newbie lose their fingertips on the one hot header, but its no fun to learn that way.

And nobby, YKIOK provided the bike owner consents....
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Kawasaki Jimbo · World Chat Champion Joined: 09 Oct 2015 Karma :

I'd suggest you might have dislodged the pick-up coil (aka crankshaft position sensor) behind the engine casing or knocked the magnetism out of it.

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Kawasaki Jimbo · World Chat Champion Joined: 09 Oct 2015 Karma :

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

cleggy92 · Derestricted Danger Joined: 18 Dec 2015 Karma :

After some fuel and cleaning plugs (or maybe it was just leaving it to sit for a while) the bike seems to no longer be cutting out and revving low. However the acceleration is still an issue.

Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

Take it for a run and give it the beans, I think this will sort most of your problems.
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kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

Check the air filter, and that you still have the correct amount of oil in the sump, because it can find its way into the airbox when bike is on its side.

cleggy92 · Derestricted Danger Joined: 18 Dec 2015 Karma :

Vincent · Banned Joined: 16 Oct 2006 Karma :

Try tapping the float bowls with a screwdriver handle...could be one of the floats is stuck open.
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talkToTheHat · World Chat Champion Joined: 21 Feb 2012 Karma :

Ok, trace the unplugged tube you've found, if it goes up into the airbox you need to plug it as it'll play games with your mixture. There's an unplugged thinner one futher back, i think that's the battery tray drain. I'll do photos if mine tomorrow.
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Kawasaki Jimbo · World Chat Champion Joined: 09 Oct 2015 Karma :

cleggy92 · Derestricted Danger Joined: 18 Dec 2015 Karma :

Okay so with the brief amount of time I had today I went to switch the bike on and noticed the fuel light on, crazy since I'd just filled it up the night before! I'm guessing something is definitely wrong as that fuel has to have gone somewhere and its not on my garage floor.

Again I've not had time to follow up on the troubleshooting options you guys have given, I will be doing this tomorrow after work. However does what I've described above (mysterious disappearing fuel) sounds like it could be a result of the unplugged tube playing games with the mixture or one of the floats stuck open?

My neighbor helped me out getting the thing moving after it had been sitting but he did it cheap so I don't want to be pestering him again and I'm a little embarrassed of the whole situation!

talkToTheHat · World Chat Champion Joined: 21 Feb 2012 Karma :

Do you have more oil than you should? Is it thin and smelling of petrol?
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Vincent · Banned Joined: 16 Oct 2006 Karma :

cleggy92 · Derestricted Danger Joined: 18 Dec 2015 Karma :

Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

cleggy92 · Derestricted Danger Joined: 18 Dec 2015 Karma :

Kawasaki Jimbo · World Chat Champion Joined: 09 Oct 2015 Karma :

It sounds like you've traced it to a fuelling-related issue, but if anyone wants to see a spare pick-up coil (late '90's Kawasaki or Yamaha, your choice) stuck to my "magnetic" garage door, car, bicycle, whatever, let me know. Fact is there are different types and the ones I've encountered have a ferrite core. I could be wrong but I suspect yours is too. It may also be perfectly positioned to suffer a damaging blow when the bike is dropped.