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Lost loads of power and glowing red exhaust help please

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kevinh23
Two Stroke Sniffer



Joined: 08 Dec 2010
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PostPosted: 18:35 - 18 Jan 2011    Post subject: Lost loads of power and glowing red exhaust help please Reply with quote

hi guys im in need of some help .

My bike today has just loss loads of power only l letting me get about 30 mph . After riding 4 miles I got to work and the bike stooled and cut out . I then noticed the exhaust was glowing red where it conects to the engine. The bike also has been popping out the end can. The bike still has compression as it still kicks back when I kick it over .

The bike is a 2000reg te 410 husqvarna

any one have any ideas what this could be.

Thanks
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SW Motech Shop UK
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PostPosted: 19:06 - 18 Jan 2011    Post subject: Reply with quote

Hm, weird one that. Air leak around carb manifold? main jet fallen out?

Any warning or did it happen suddenly? any funny mechanical noises prior to it happening?
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Fortuna
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PostPosted: 19:07 - 18 Jan 2011    Post subject: Re: Lost loads of power and glowing red exhaust help please Reply with quote

kevinh23 wrote:

stooled and cut out .
Thanks


You're bike shat everywhere?

Seriously though, sounds like an exhuast valve is stuck open.
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kevinh23
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PostPosted: 19:16 - 18 Jan 2011    Post subject: Reply with quote

How can I deal with that or am I best taking to a garage. The engine has got a weird noise over last week some one told me it could be tappetts and some one said could be the top end. The noise is like a rattling noise . But I would guess if it was top end out pistons it would not even start.
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Mrs Vale46
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PostPosted: 19:16 - 18 Jan 2011    Post subject: Reply with quote

This is a funny one isn't it........mmmmm?

Im thinking something either exhuast port/valve or soemthing maybe with air and its not getting enough?

Confused
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kevinh23
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PostPosted: 19:18 - 18 Jan 2011    Post subject: Reply with quote

Could it be no water in raditor as I have not checked that in a while. And its over heating ?
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Syris the Indomitable
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PostPosted: 19:25 - 18 Jan 2011    Post subject: Reply with quote

Yeah valve/timing issue after you said popping which I assume is back fire.
Back fire is unburned exhaust gasses which ignite in the manifold as a result of bad timing or faulty valves. Also explain red exhaust if the mixture is igniting in the manifold backfiring as opposed to firing in the cylinder.

If your not mechanically minded this is a a job for the garage,
manual and tools needed.
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Syris the Indomitable
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PostPosted: 19:29 - 18 Jan 2011    Post subject: Reply with quote

kevinh23 wrote:
Could it be no water in raditor as I have not checked that in a while. And its over heating ?


No, it's the back fire which is unburned mixture exploding in the manifold as a result of timing issue or broken/stuck valve.

You might be lucky, your timing may be out in term of the pick ups but unlikely.

Just wondering if your engine oil is low or needs changing too!!
I change mine every 1000, I have a single pot bike too.

1 other suggestion, it may just be a fuel issue like needle valve stuck thus throwing loads of fuel in making the mixture very rich.
I would look at this first!
If this is the case petrol will be flowing out of the over flow from base of carb. If yours is the new model it will be fuel injection so this will not happen.
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chris-red
Have you considered a TDM?



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PostPosted: 19:56 - 18 Jan 2011    Post subject: Reply with quote

I think the bike is running very lean, if you keep riding it it will melt the piston and cause lots of damage (If it hasn't already) This would cause the fact bikes and the redhot exhaust. Check of leaks in the manifold and check the air filter is secured properly and not damaged, I would also be tempted to whip the head off to check the piston.
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kevinh23
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PostPosted: 19:59 - 18 Jan 2011    Post subject: Reply with quote

How can I check the petrol vale to see if its that. I have taken carbretters apart before guessing its in there.
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kevinh23
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PostPosted: 20:03 - 18 Jan 2011    Post subject: Reply with quote

What does lean mean?
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kevinh23
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PostPosted: 20:03 - 18 Jan 2011    Post subject: Reply with quote

What does lean mean?
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Mrs Vale46
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PostPosted: 20:11 - 18 Jan 2011    Post subject: Reply with quote

you know the perfect ratio 14.7:1 if its higher than that its running rich if its lower then its lean.

Basically the air fuel mix, to much fuel its rich and to little and its running lean.
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Syris the Indomitable
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PostPosted: 20:16 - 18 Jan 2011    Post subject: Reply with quote

kevinh23 wrote:
How can I check the petrol vale to see if its that. I have taken carbretters apart before guessing its in there.


It will only be an issue if there is fuel leaking from the overflow pipe at the base of the carb, or your spark plug is white or light gray in colour meaning your running lean and well hot!, if not no problem.

Lean means too much air flow, not enough petrol in your mixture.
Take out the spark plug, if the colour of the end is light grey or even white it's running way too lean thus this will be your problem.

Rich is too much petrol as a result of bad mixture setting or needle valve sticking leading to float chamber over flowing.
The spark plug will be nearly black if this is the case.

Brown your ok.

I have to say though the backfire is the big clue here which is caused by bad timing or, as previously stated an exhaust valve stuck open. The popping you stated is backfire, this is unburned mixture igniting in the manifold.
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Last edited by Syris the Indomitable on 20:23 - 18 Jan 2011; edited 2 times in total
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chris-red
Have you considered a TDM?



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PostPosted: 20:21 - 18 Jan 2011    Post subject: Reply with quote

Check your spark plug colour

https://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm
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kevinh23
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PostPosted: 20:28 - 18 Jan 2011    Post subject: Reply with quote

The plug looks fine. Just checked it.

If I took this to a garage thinking its one of the above anyone know how much it will cost ?

Thanks for every ones help here.
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kevinh23
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PostPosted: 20:30 - 18 Jan 2011    Post subject: Reply with quote

The plug looks fine. Just checked it.

If I took this to a garage thinking its one of the above anyone know how much it will cost ?

Thanks for every ones help here.
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kevinh23
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PostPosted: 20:30 - 18 Jan 2011    Post subject: Reply with quote

The plug looks fine. Just checked it.

If I took this to a garage thinking its one of the above anyone know how much it will cost ?

Thanks for every ones help here.
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kevinh23
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PostPosted: 20:31 - 18 Jan 2011    Post subject: Reply with quote

How can I check the petrol vale to see if its that. I have taken carbretters apart before guessing its in there.
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0l0dom0l0
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PostPosted: 20:59 - 18 Jan 2011    Post subject: Reply with quote

Mrs Vale46 wrote:
you know the perfect ratio 14.7:1 if its higher than that its running rich if its lower then its lean.

Basically the air fuel mix, to much fuel its rich and to little and its running lean.


Actually that might be the perfect mixture, but you will get more power running richer than that.

for optimum power 13.2:1 is spot on!

Is the bike actually moving when its doing this?

EDIT:

I would back that its running lean. Can you take a picture of your plug and post it please?
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Mrs Vale46
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PostPosted: 21:06 - 18 Jan 2011    Post subject: Reply with quote

Quote:
Actually that might be the perfect mixture, but you will get more power running richer than that.

for optimum power 13.2:1 is spot on!


This can be true depending on the vehicle but the written law is 14.7:1

Sorry Confused
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Mrs Vale46
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PostPosted: 21:06 - 18 Jan 2011    Post subject: Reply with quote

Just had to say that
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Frost
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PostPosted: 21:12 - 18 Jan 2011    Post subject: Reply with quote

Sounds like a buggered exhaust valve to me. Get it compression tested at a garage.
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0l0dom0l0
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PostPosted: 21:12 - 18 Jan 2011    Post subject: Reply with quote

Mrs Vale46 wrote:
Quote:
Actually that might be the perfect mixture, but you will get more power running richer than that.

for optimum power 13.2:1 is spot on!


This can be true depending on the vehicle but the written law is 14.7:1

Sorry Confused


Normally, its down to emission laws. 14.7:1 will give you the perfect burn, resulting in less waste gasses which is probably why its classed as the best ratio.

In practice though, if given the option, I wouldn't run something on that ratio as you have very little margin for error. If its a hot day, and you start burning 15:1 then that's getting pretty lean for my liking!
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Ichy
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PostPosted: 21:12 - 18 Jan 2011    Post subject: Reply with quote

kevinh23 wrote:
Could it be no water in raditor as I have not checked that in a while. And its over heating ?



I feel the need to ask since it only takes a few minutes to check the rad. Have you done it?

An overheating bike will cause a lean mixture and create popping in the exhaust due to unburnt fuel, waste from the overrun, igniting from the hot exhaust.
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