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GP100 not starting

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Milo
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Joined: 08 Feb 2002
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PostPosted: 18:56 - 07 Dec 2004    Post subject: [HELP!] GP100 not starting Reply with quote
It's got fuel, it's got oil, it's got air, it's got all of this in the cylinder...it's got a spark and the timing's fine and it still won't bloody start! Evil or Very Mad

Before this happened it wouldn't idle at all and seemed very lumpy when pulling away and on the last journey where it was working (thankfully the one home!) it was struggling to go up a steep hill over 15mph.

I know the small end bearing needs replacement so I've got all the bits for that but I doubt that's what the problem is..?

Seems to turn over fine when kicking and trying to bump-start it.

Any ideas?

Ta much muchly.

Adam
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swampy
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Joined: 04 Aug 2004
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PostPosted: 19:11 - 07 Dec 2004    Post subject: Re: [HELP!] GP100 not starting Reply with quote
Milo wrote:
It's got fuel, it's got oil, it's got air, it's got all of this in the cylinder...


Thats cool, but are they all getting squashed into a very tight space at the right time ?? Wink

Seriously,have you checked for compression ??
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Retro-Man
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Joined: 21 Aug 2004
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PostPosted: 19:48 - 07 Dec 2004    Post subject: Reply with quote
sounds like a cylinder rebuild is required, that small end noise might be piston slap. does it kick over very easy (no resistance)

Cheers
Retro
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Robby
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Joined: 16 May 2002
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PostPosted: 23:48 - 07 Dec 2004    Post subject: Reply with quote
Sounds like rebuild time.

When it was struggling, did it have a very narrow smoothish powerband and horribly rough and misfiring outside of that?

If so, its top end rebuild time, and it may well need a rebore too. Don't buy bits until you have it apart, you may well need to get an oversize piston.
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Ninja
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Joined: 22 Apr 2004
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PostPosted: 10:57 - 08 Dec 2004    Post subject: Reply with quote
maybe a wee bit simpler - but is the fuel fresh? If it's any more than a week old it may have gone 'off'. Take a sniff in the tank - is the petrol smell as strong as usual?

Fresh fuel - try it ... Wink Thumbs Up
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mchaggis
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Joined: 09 May 2004
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PostPosted: 12:11 - 08 Dec 2004    Post subject: Reply with quote
Ninja wrote:
maybe a wee bit simpler - but is the fuel fresh? If it's any more than a week old it may have gone 'off'. Take a sniff in the tank - is the petrol smell as strong as usual?

Fresh fuel - try it ... Wink Thumbs Up


The petrol in mine is at least a month old and it works fine.
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Milo
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Joined: 08 Feb 2002
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PostPosted: 13:07 - 08 Dec 2004    Post subject: Reply with quote
robby wrote:
When it was struggling, did it have a very narrow smoothish powerband and horribly rough and misfiring outside of that?


Seemed okay, revs wise. It wasn't misfiring - just a big lack of power.

The fuel's fine, and if it wasn't betting squished in the right place I'd still hear something out of the ordinary I'm sure
Sounds like rebuild time to me.

I'm pretty certain it's standard bore, but I'll check before ordering new bits for it.

Cheers all for the information, I'll give it go at the weekend. Damn dark evenings - grr! Neutral
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palmer
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Joined: 21 Jul 2004
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PostPosted: 22:05 - 08 Dec 2004    Post subject: Reply with quote
exhaust tightly on? when mine broke off it wouldnt start, but when i welded it back on it was fine Smile

(yes its a dumb sugestion)
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Milo
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Joined: 08 Feb 2002
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PostPosted: 17:41 - 09 Dec 2004    Post subject: Reply with quote
Yeah, the zorst is fine...though now the throttle assembely's snapped in half becuase it was knocked over during the day! Evil or Very Mad
I think my XJ's hiring a hitman to bugger up my little bike cos it wants all the attention! Laughing
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