GS500 revving problem

Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

Hopefully someone might be able to come up with something I havent already checked, basically the bike idles fine but when you rev past 5-6k it loses all power and wont go past that mark.

So far ive checked:
stripped and cleaned carbs
checked compression
checked coils and ht leads
checked fuel vacuum pipe and bypassed it so its a direct feed
changed carb rubber seals
changed carbs (worked perfect the first test yesterday, started doing it again today)

Anyone have any ideas what could be causing it?

flumpy7 · Could Be A Chat Bot Joined: 31 May 2008 Karma :

Have you checked float heights?

Have you checked the joins between engine and carbs for leaks?
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2012 Sinnis apache

orac · World Chat Champion Joined: 25 Sep 2011 Karma :

plugs is the obvious ones, what colour are they
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Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

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

What condition is the fuel in? 5 to 6K is about where she will come onto main jet if there is a touch of water in the fuel it will kill it. Take the drain plugs out and drain into your hand, you will see any water.
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Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

Air filter. My bike runs like shit without one and almost just as bad with a dirty one.

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

It is not getting fuel when it needs it most so.....Fuel pump (if you have one), fuel filter, tank venting properly ( take the filler cap off and run it).
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Bikers make great organ donors, get 115 on your licence today.

Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

katana · Trackday Trickster Joined: 04 Jul 2004 Karma :

When did this start, after the rebuild?

Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

J.M. · World Chat Champion Joined: 27 Mar 2011 Karma :

Somebody hasn't messed with the main jet sizes have they?
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Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

Another option is you did not put the carbs back together proper or clean them proper or one of your main jets was not tight and is now sitting in the float bowl

Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

I just want to ride!

Docker · Borekit Bruiser Joined: 15 Oct 2012 Karma :

put the original carb and air filter back on, changed the ht leads to ones i had on a diff bike and it will reach 7-9k revs before bogging this time, next on the list is new coils, seems my test ones may not have been up to scratch either.