KTM 450 2008

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KTM 450 2008

Post by Mathew_3066 on Mon Nov 09, 2015 8:17 pm

Evening all Very Happy

Couple of weeks ago my 450 would cut out when you blip the throttle and stall.

Speaking to a mate he asked if i had been near water and maybe the carb breathers had blocked up. I stripped the carb and cleaned all the jets, fitted new drain/breather pipes refitted the carb and it was perfect.

Rode it twice and it was flying.

Last weekend after heavy rain, I went through a puddle and it bogged down again so thought, my fault should of not gone through the water and stripped the carb again. Re-fitted the carb Saturday and it started straight away. Rode it about 2 miles so it was warm and as I stopped pulling the clutch in and it would not idle and cut out.

Was a nightmare to start, once it started if you kept the revs up ot was fine, if ridden hard there was no problem was pulling just as it should. Just would not idle and was very hard to start via kickstart (battery had gone flat)

Yesterday I stripped the fuel tank off, removed the fuel tap and cleaned the filter out (full of crap). removed the crankcase breathers and cleaned them. Put it all back together and it started on the button and would rev up fine but its was cold.

My next port of call would be to check the valve clearances but i got a feeling it fuel related.

Anyone heard / suffered this sort of problem or advice on what else to check?? Very Happy
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Re: KTM 450 2008

Post by curl666 on Mon Nov 09, 2015 8:35 pm

How deep are you going? Puddle? Must be over the air box/ carb to keep cleaning it out Smile

For the cost of a few quid you are best of fitting new jets, you can't always see the crap Inside


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Re: KTM 450 2008

Post by Mathew_3066 on Mon Nov 09, 2015 8:38 pm

The water isn't coming up that high but enough for the pipes to hit the water I would of thought.

would it still cause it to play up when warm?? seems fine when cold that is what is making me think its nothing to do with fuel??
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Re: KTM 450 2008

Post by shocker on Mon Nov 09, 2015 8:51 pm

Are all the breathers from the carb still hanging down below the swing arm?

Water of much depth will temporarily block the carb and stop the engine running.
Get some 6mm pipe and T's (aquatic shops flog it for pennies) then cut the pipe as high as possible, fit a T and run one pipe down, then the other up and into the air box - she'll be like a submarine after Very Happy

It does sound like you've still got a bit of shit or more likely water still in the carb that needs shifting first though?
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Re: KTM 450 2008

Post by Mathew_3066 on Mon Nov 09, 2015 9:12 pm

yes they're all still down by the swing arm.

which ones do I need to run up into the airbox?? the pipe that drains the float I guess can stay down by the swing arm ?? but the other four up into the air box, are they all breathers ??

Thanks for the help lads
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Re: KTM 450 2008

Post by curl666 on Mon Nov 09, 2015 9:20 pm

if your valve clearance is out, it would affect the starting of the bike but it wouldn't make the bike run irraticallly, it would either run or not.

For it to run irraticallly it would be air/fuel or electrical.

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Re: KTM 450 2008

Post by wolfy on Mon Nov 09, 2015 9:23 pm

No expert but seen these probs before...you did clean out the pilot jet ?
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Re: KTM 450 2008

Post by Mathew_3066 on Mon Nov 09, 2015 10:02 pm

yeah took all the jets out and soaked them in brake cleaner and blew out with air.

After the first time of cleaning the carb it pulled like a train. This time problem still seems to be there. if it was a problem with the carb still surely the problem would be there regardless of the engine temp??
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Re: KTM 450 2008

Post by curl666 on Mon Nov 09, 2015 11:21 pm

Have you tried setting up the idle?

If you read the Ktm manual it will explain how to do it exactly using the black knob on side of carb and the mixture screw on the base of the carb.

The idle is suppose to be set once the bike is at operating temp, which could explain the fault?

The manual also states a bike with a correctly set idle will always be easier to start.

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Re: KTM 450 2008

Post by Mathew_3066 on Tue Nov 10, 2015 7:33 am

Ice had a fiddle with the black idle screw but seems impossible to get to the screw underneath the car whilst it's on the bike.

As you said that may be my fault as it does say when at running temp

Will try that out the weekend thank you
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Re: KTM 450 2008

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