tomprescott
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| posted on 19/9/09 at 01:14 PM |
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Please help me with my bike troubles
Hi folks,
I have a 1990/91 GSF400-z, a japanese import bandit. After buying the bike it would start but wouldn't idle, I had to constantly rev the bike to
stop it from cutting out.
After further inspection my tank was full of rust, I've cleaned out the tank and the fuel cock and reconnected everything but now the bike
won't start.
Everything is correctly connected and the engine turns over (and good spark on all plugs) but it still won't start. Any ideas? Cheers, Tom
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mrwibble
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| posted on 19/9/09 at 01:17 PM |
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is it possible the fuel filter is clogged by all that rust? does the fuel pump whine when ignition is turned to 1st pos?
[Edited on 19/9/09 by mrwibble]
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tomprescott
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| posted on 19/9/09 at 01:20 PM |
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The fuel cock has a filter at the top of each pipe (long one for normal, short one for reserve) and bolts into the bottom of the tank, there
isn't a fuel pump on the bike, its just vacuum and gravity fed. I have a nasty feeling that there could still be crud in there but I have no way
of telling - baffled tank and the two access points are the fuel cock hole and filler neck.
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blakep82
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| posted on 19/9/09 at 01:22 PM |
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carb needles full of crap maybe?
might sound silly, i don't know your bike (or much about bikes for that..) could you have put the fuel filter in the wrong way around when you
put it all back together?
________________________
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001Ben
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| posted on 19/9/09 at 01:30 PM |
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Are you getting fuel to the carbs? There is sometimes stop on the tank to turn off the fuel, has this been knocked/switched
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rayward
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| posted on 19/9/09 at 01:31 PM |
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sound like you need to to strip the bottoms of the carbs, check the floats/needles etc
hth
Ray
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miikae
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| posted on 19/9/09 at 01:50 PM |
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I had that problem some years ago , stripped tank off, gave it a good flush out and then used some American epoxy lining stuff ,consisting of
cleaner, etcher and final coat , then stripped carb and found idle jets blocked and loads of crud in the float bowls.
Mike
If it can be done it i will be done .
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tomprescott
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| posted on 19/9/09 at 01:59 PM |
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Cheers guys, fuel filter and petcock can only go in one way so its not that, the fuel cock has res and on so on either setting it should get fuel
through.
I've taken the tank off and fuel is coming out through the petcock and the filters are still clear so that is fine for the moment, though
I'll look into that tank cleaner/liner.
I've (very dangerously) used a clear plastic bottle and some hose as a replacement fuel tank so that I can see if/how much fuel was used and
striaght away the carbs took a lot of fuel - I'd say 200ml in about three secs. I guess this means that the problem lies with the carbs,
probably the floats(?). I'm gonna pull apart the carbs and clean them.
No doubt I'll be back on later needing help as to the specifics of carb cleaning and maintenance. Thanks very much everybody.
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Peteff
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| posted on 19/9/09 at 02:24 PM |
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The idle jets will be blocked. Unscrew them with a straight screwdriver and clean them out they are usually down a hole next to the main. I used a
bristle off a wire brush to clean mine as they were solid 
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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