Loss of power

Squeaky back brake? Hard to control at 30mph/40kph?
dave74
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Loss of power

Post by dave74 » Wed Mar 28, 2012 8:31 pm

Very occasionally, after the bike has been `rested` over a weekend, on the first ride afterwards it suffers an almost complete loss of power. It doesn`t turn into a 500cc single but the power loss is so great I have to whip in the clutch and coast to a halt. It happens within 1-3 miles. The engine doesn`t stop and ticks over OK. I have kept the throttle wound open to `clear its throat` but only when in a straight line.
It recovers power within 3 seconds or so. Once the loss has happened it may not occur for weeks or months,
happened about 5 times in total since July 2010.
Mileage is 5500.
In at the dealers having a new fuel filter fitted at present.
Any suggestions?

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kevxtx
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Re: Loss of power

Post by kevxtx » Thu Mar 29, 2012 4:05 am

Any fault codes?

Tank fuel filter.

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PDavo
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Re: Loss of power

Post by PDavo » Thu Mar 29, 2012 10:37 am

Sods law if your warrantee's ran out, but from wot you discribe sounds like some sort of fuel shortage( no pun on pending fuel shortage when tanker drivers strike)
Old enough to know better but wtf

2010 KTM SM-T (now matt black), Silver 2006 BMW K1200r

dave74
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Re: Loss of power

Post by dave74 » Thu Mar 29, 2012 6:33 pm

No fault codes but a new fuel filter fitted. I pick the bike up tomorrow. I`ll keep my fingers crossed....

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Re: Loss of power

Post by kevxtx » Fri Apr 06, 2012 1:46 pm

dave74 wrote:No fault codes but a new fuel filter fitted. I pick the bike up tomorrow. I`ll keep my fingers crossed....

Did the filters fix your problem, what was the price for the filters?

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Re: Loss of power

Post by dave74 » Tue Apr 10, 2012 8:31 pm

So far the new fuel filter kit appears to have solved the problem. The kit including 20% VAT was GBP70.52 and took 1 hour to fit (by dealers).

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kevxtx
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Re: Loss of power

Post by kevxtx » Tue Apr 10, 2012 10:06 pm

Mine has done the same thing started on my way from work on Thursday, it cuts out when you get on the throttle hard, if you open the throttle normally it will rev through, so I pulled my fuel pump out on the weekend to find the tea bag filter blocked up, I cleaned it out & ordered in a filter kit yesterday, I will be fitting the filter kit today.

I can't believe the price on the 2 filters, I will make up a spare set using the old one as samples for the next filter change, I have ordered in a tea bag filter from the UK & will modify it to fit the KTM pump & will source the main filter when I have the sample, I will post what I did so others can save some money.

http://www.ebay.com.au/itm/270802983803 ... 1439.l2649

A photo's after I cleaned the tea bag filter, it was completely black & blocked before.

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kevxtx
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Re: Loss of power

Post by kevxtx » Wed Apr 11, 2012 5:07 am

Got the fuel filter kit today Australian AUD$140.00 & what a joke the main filter is, it is way to small to do any high mileage no wonder it has blocked up. Next time I will fit a Z201 inline filter as the main filter & remove the small KTM round filter completely.

I used the new modified filter kit with different tea bag filter.

The replacement fuel filter has fix the starving fuel problem.

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Mikeylikesit
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Re: Loss of power

Post by Mikeylikesit » Mon May 21, 2012 8:17 pm

Hi guys,
My 2011 smt with 5500kms has the same symptoms. The motor falls flat on its face at wot around 8000 rpm. If I hold wot in 2 or 3rd gear the erratic revs will fall to 7000rpm and surge like crazy. It seems to get better after a while but is still there. If I stay under 75% throttle all is fine.

Kevxtx, did you source an aftermarket round filter?

This fuel filter purge kit looks interesting

http://advrider.com/forums/showthread.php?t=774943

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Re: Loss of power

Post by kevxtx » Tue May 22, 2012 1:08 am

I have not followed up in finding the round paper filter yet, I can get the pre filters for around $7.50.

What I have done in the mean time is fit a $5.00 inline fuel filter on the cross over pipe between the tanks, this will filter the fuel passing from the right tank to the pump in the left tank, this will extend the life of the main filters.

It looks like one of these filters.

http://www.google.com.au/imgres?imgurl= ... s=1&surl=1

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Re: Loss of power

Post by dave74 » Wed May 23, 2012 8:28 pm

New fuel filter seems to have sorted the problem for the time being. However, I contacted KTM HQ in Northants regarding a different issue. I mentioned the fuel filter and the guy suggested may they need replacing every 5000 miles or so! Blamed the amount of ethanol that is in unleaded.
Never had fuel filter issues with the old XTZ750 or any of my cars come to trhink of it!

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Re: Loss of power

Post by kevxtx » Wed May 23, 2012 11:01 pm

This is why I have fitted an extra fuel filter on the cross over pipe to extent the life of the fuel filters.

If there is a next time for me I will remove the round paper filter completely & fit an inline filter Z200/Z210 high pressure filter.

http://www.fullnoise.net.au/purolator-f ... se-imports

http://www.supercheapauto.com.au/online ... escription

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Re: Loss of power

Post by PDavo » Wed May 23, 2012 11:47 pm

kevxtx wrote:This is why I have fitted an extra fuel filter on the cross over pipe to extent the life of the fuel filters.

If there is a next time for me I will remove the round paper filter completely & fit an inline filter Z200/Z210 high pressure filter.

http://www.fullnoise.net.au/purolator-f ... se-imports

http://www.supercheapauto.com.au/online ... escription
Where would you put it
Old enough to know better but wtf

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kevxtx
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Re: Loss of power

Post by kevxtx » Thu May 24, 2012 1:01 am

In the standard air box, I would pull the pipe off the throttle bodies & fit it to one end of the fuel filter & then fit a new fuel pipe on the other end of the fuel filter to the throttle bodies.

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Mikeylikesit
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Re: Loss of power

Post by Mikeylikesit » Thu May 24, 2012 10:32 pm

Hey kevxtx

Did the larger generic teabag filter you installed in your fuel pump have to be modded at all? My mike is running good again after a full tank of gas on a dirt road ride. I think I had a bad tank of gas or the dirt road shook the filter clean.......?

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Re: Loss of power

Post by kevxtx » Fri May 25, 2012 1:06 am

Yes it needs to be modified.

I will post some photo's on how to carry out this mod soon.

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Re: Loss of power

Post by Mikeylikesit » Sat May 26, 2012 5:51 pm

Thx Kevxtx.

My bike started loosing wot power again and I'm now waiting for the my dealer to contact ktm about replacing my fuel filters. If they don't warranty it I will do it myself. I have been doing
a lot of reading on purging the filters with an electronic gizmo that reverses the pump after the bike is shut off. I would buy it in a heartbeat but $270us plus shipping is a wee bit rich for me. I will now investigate building a simple manual purge harness that I can plug onto the pump connector periodically and push a button for a few seconds. If I get it right I will post it up.

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Re: Loss of power

Post by ShauniSMT » Fri Jul 06, 2012 8:09 am

hi there

is there a step-for-step guide on replacing the fuel filter, can i do it myself or should a dealer do it rather???? cuz i think my bike is suffering from the same crap.....

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Re: Loss of power

Post by Mikeylikesit » Fri Jul 06, 2012 7:51 pm

If your still under warranty you should get the ktm dealer to do it for free. That what i did at 5000 kms. Otherwise it will take some mechanical knowledge cus you must take the tank off and pull the pump out and replace the filters in the pump. Do a bit of searching on fuel pump and tank removal i recall seeing a step by step on this forum.

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Re: Loss of power

Post by Spark01 » Sat Jul 07, 2012 11:05 am

Mikeylikesit wrote:Thx Kevxtx.

My bike started loosing wot power again and I'm now waiting for the my dealer to contact ktm about replacing my fuel filters. If they don't warranty it I will do it myself. I have been doing
a lot of reading on purging the filters with an electronic gizmo that reverses the pump after the bike is shut off. I would buy it in a heartbeat but $270us plus shipping is a wee bit rich for me. I will now investigate building a simple manual purge harness that I can plug onto the pump connector periodically and push a button for a few seconds. If I get it right I will post it up.
Purge will help (maybe) to keep the fuel filter a bit cleaner for a longer time.
But where does the filth go with a reverse flow.... right back in your fuel tank, so in the long run it won't help.
Because the amount of filth keeps building up inside your fuel tank.

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