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Victory it starts

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WULFSTAN
World Chat Champion



Joined: 18 Sep 2010
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PostPosted: 14:31 - 17 Dec 2013    Post subject: Victory it starts Reply with quote
After putting a new head on my Kawasaki gt 550 Ive just put the carbs back on haven't put the air box back in yet as i just wanted to see if it would start. Am almost 100% sure that i got the timing spot on yet when i tryed starting it i got a big pop back that blew the carbs straight off the bike. Is it bad timing or just way too lean with no air box? or have i put the spark plug leads on the wrong way. Thanks
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Your backside is better enough for you to run again, if need be – bristle up the courage of the cornered rat, put on a bold front, and to hell with them. Bluff my boy – bluff, shift and lie for the sake of your neck and the honour of Old England

Last edited by WULFSTAN on 16:25 - 17 Dec 2013; edited 1 time in total
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Rogerborg
nimbA



Joined: 26 Oct 2010
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PostPosted: 14:54 - 17 Dec 2013    Post subject: Re: Have i fucked the cam timing? Big pop back though carbs Reply with quote
It seems unlikely that you'd get it exactly wrong enough to backfire without lunching the valves, so...

WULFSTAN wrote:
have i put the spark plug leads on the wrong way. Thanks

<Warped Story Bro>I put the (unhanded Mad) distributor cap on the wrong way round on a Ford Crossflow engine, resulting in a 20' geyser of a jet of flame spitting out of the carb.</Warped Story Bro>

So double checking the firing order would be my first port of call.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike
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69chris
Trackday Trickster



Joined: 10 May 2011
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PostPosted: 15:15 - 17 Dec 2013    Post subject: Reply with quote
you didnt mix up the cams by mistake did you bud ?? valve clearences ok ??

my mates old xs650 used to blow the carbs off with no filters fitted, i didnt realise a lean mixture would cause that but on his once the filters were on no prob, take em off and 1st kick would pop them off......spooky Laughing
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WULFSTAN
World Chat Champion



Joined: 18 Sep 2010
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PostPosted: 15:44 - 17 Dec 2013    Post subject: Reply with quote
Ha Ha victory plug leads were wrong way round Thank god.
____________________
Your backside is better enough for you to run again, if need be – bristle up the courage of the cornered rat, put on a bold front, and to hell with them. Bluff my boy – bluff, shift and lie for the sake of your neck and the honour of Old England
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Robby
Dirty Old Man



Joined: 16 May 2002
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PostPosted: 15:47 - 17 Dec 2013    Post subject: Reply with quote
If it's blowing the carbs off the bike, then it's igniting the mix with at least one inlet valve open. That would suggest the timing being out by 180 degrees.
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andym
World Chat Champion



Joined: 16 Nov 2010
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PostPosted: 16:09 - 17 Dec 2013    Post subject: Reply with quote
I had similar when I rebuilt the zxr engine, when I'd put it all back together and tried to start it, it would just turn over until eventually there was a loud bang and enough smoke coming out of the airbox to make me think something was on fire in there

When I took the top off the engine again I noticed I'd set both camshafts to EX Embarassed
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Old Thread Alert!

The last post was made 12 years, 66 days ago. Instead of replying here, would creating a new thread be more useful?
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