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January 19th, 2017, 03:14 PM   #1
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450 2004-2008 poor idling etc

I have three 450s here that are 2004, 2007 and 2008. and the first two i've put together run poorly at idle/tickover, they backfire and stall. also glowing headers unless I put in quite a large PJ of 45-48.

It helped that I increased the valve clearance to reduce the valve timing but at the end of the day I'm going to have to do shedloads to sort this I reckon unless somebody recoignises the problem?

BTW, it could still be ignition, still be a worn carb, can still be......

any ideas to cut short this long haul appreciated.

Taffy
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January 20th, 2017, 03:01 AM   #2
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Wow. You are the pro!

Airleaks?

And ye, ignition. I saw some transparent plug, like a window to see the real spark color.

Tps, does go up when you set idle speed.

Swap carbs and see.

Can you tell that im just guessing?
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January 20th, 2017, 03:06 AM   #3
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on one of them we have swopped the stator, flywheel, pick-up, coil, carb cleaned twice then swopped, changed exhaust, plug, then we stripped the engine, then we swopped the engine.

but I haven't taken it seriously yet!

Taffy
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January 20th, 2017, 05:51 AM   #4
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Sounds like a broken exhaust valve spring, knackered exhaust valves or exhaust valves not seating properly.
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January 21st, 2017, 12:39 AM   #5
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seats cut and new valves Eric

cheers

Taffy
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January 21st, 2017, 06:26 AM   #6
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Well. Maybe manufactured by an intern, on a monday. Bet he liked kawasaki better to.
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April 16th, 2019, 03:36 PM   #7
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Any resolution to this? I fear I'm suffering similar symptoms...
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April 16th, 2019, 11:40 PM   #8
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Not that I recall. my memory is terrible now. what i would do now is try a smaller PAJ in the front face of the carb. go down to a 60 and see what happens.

the thing is, look at most of my posts and i don't get a reply and that is when i'm trying to give help or advice, so the idea that i was going to get any help when I asked for it was always going to be a 'no chance'.

to me, it had to be ignition advance but what to do? clearly, half the combustion was taking place outside the engine! the trouble is, that doesn't have to be lean, it can be 'delayed' and it can be rich burning late.

the pilot screw didn't make any difference.

Taffy
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April 17th, 2019, 04:57 AM   #9
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Hi Taffy

This is a hard one by the sounds of it.

Is it the 2004 and 2007 that are not good and the 2008 runs well? If I recall the 2004 has the dellorto?

I have seen this where the carb boots on the 07 and 08 have small splits behind the hose clamps....
But this did not happen on the dellorto boots.

The small o-ring in the mixture screw is worn out or gone.

Spark plug cap wire not connected properly but you still get a good spark because when testing you tend to push down cap.

Many years ago I saw a case where the throttle slide was put in backwards......I don't think you can do this on a kein or dellorto though.

Exhaust pipe with air leaks.....

Small things but can be hard to find .......

Let us know what happens....

Regards
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April 17th, 2019, 06:06 AM   #10
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all of them were bad. all are 2004-2008n which means Kokosan and keihin. no hose splits, no o ring fractured or missing.


an air leak in the exhaust has never been a problem really, not unless a very rich mixture which some of the old dell orto carbs had!

Taffy
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