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Old 10-18-2018, 03:45 PM   #1
2wheelieadv
 
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Bike stumbles down q.

I've noticed that my bike's power shuts down over 5k rpms. If I'm still on throttle, it coughs, then gets sudden power and continues up to 6.5-7k, then coughs again, and so on.
I don't remember if it was always the case as I normally upshift below 5 k.
So is that because the torque ends at that rpms, or something is not normal? 2007 1250s with 44k + miles on it.

Thanks.

Last edited by 2wheelieadv; 10-18-2018 at 03:58 PM.
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Old 10-18-2018, 08:11 PM   #2
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Re: Bike stumbles down q.

Possibly a clogged fuel filter in the tank.
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Old 10-19-2018, 09:19 AM   #3
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Re: Bike stumbles down q.

Update.
As I rode from work, I tried to rev it again in upper RPM's but that haven't happened. I just filled up the tank.
So it happens occasionally, and now I remembered even on a highway in 6th gear when I needed to pass at 75-80 mph it suddenly bogged down on me. I'm starting to suspect that it happens when there's less than half tank of fuel.

I'll pup the pump and check the filer.
Thank for the tip.

Last edited by 2wheelieadv; 10-19-2018 at 11:30 AM.
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Old 10-20-2018, 07:01 AM   #4
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Re: Bike stumbles down q.

Sure does sound like the internal screen filter in the fuel pump assembly, had exactly these symptoms.

Basically there is a gradual build up of a varnish like substance that needs to be scraped of the filter, piece of exposed strands of heavy gauge wire poked down the hole and a liberal flush with carb cleaner did it for me, no problems for the past 5,000kms.

There should be a How-To on here somewhere, someone will probably point it out soon.
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Old 10-20-2018, 09:32 PM   #5
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Re: Bike stumbles down q.

Thanks Barry.
I'll take a look how it is. Either will clean it or ger a mew one.
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Old 10-22-2018, 10:26 PM   #6
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Re: Bike stumbles down q.

This seems to becoming more common, is there an aftermarket fix for this?
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Old 10-23-2018, 06:31 AM   #7
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Re: Bike stumbles down q.

The problem with the small internal filter is that it's on the high pressure side of the fuel pump. You just can't install a standard fuel filter in the line from the pump to replace the small strainer.

Any replacement in line filter would need to have high pressure fittings as well as being able to withstand the pressure itself without impinging on the fuel flow to the injectors. Not sure about you, but having extra connectors in the fuel line sitting between me an a hot motor is not an enhancement I'd like to consider

The cleaning of the strainer is very simple, and once you have done it a couple of times you can have the pump out of the tank, cleaned and back on the road in less than 30 minutes, takes me longer to change the oil filter .

I think cleaning this internal strainer is something that should be added to every 10,000 km service.
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Old 10-23-2018, 08:11 PM   #8
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Re: Bike stumbles down q.

Quote:
Originally Posted by barry_mcki View Post
The problem with the small internal filter is that it's on the high pressure side of the fuel pump. You just can't install a standard fuel filter in the line from the pump to replace the small strainer.

Any replacement in line filter would need to have high pressure fittings as well as being able to withstand the pressure itself without impinging on the fuel flow to the injectors. Not sure about you, but having extra connectors in the fuel line sitting between me an a hot motor is not an enhancement I'd like to consider

The cleaning of the strainer is very simple, and once you have done it a couple of times you can have the pump out of the tank, cleaned and back on the road in less than 30 minutes, takes me longer to change the oil filter .

I think cleaning this internal strainer is something that should be added to every 10,000 km service.
Would you rather get a new one or clean the old is good enough?
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Old 10-23-2018, 08:17 PM   #9
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Re: Bike stumbles down q.

The problem is you just can't get the small screen, it's part of a larger assembly, and thats if you can find it anywhere that still has stock, last time I checked it was about $80 plus delivery. 30 minutes and a bit of carb cleaner is a cheaper option.

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Old 10-24-2018, 04:39 AM   #10
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Re: Bike stumbles down q.

Update:

I was wrong on the price it was US$136.88 plus delivery :



The mesh lives down this little hole, you can also see the expensive custom-made tool for cleaning it:



Here is an interesting thread on an external filter that the V-STROM lads put together, not Bandit, but close enough to give you some ideas: https://www.vstrom.info/Smf/index.php/topic,6105.0.html

BTW those Bandit fuel pumps you find on eBay is just the motorised pump unit and it does not include the fuel regulator module that houses the micro strainer.

Last edited by barry_mcki; 10-24-2018 at 05:31 AM.
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Old 10-25-2018, 11:32 PM   #11
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Re: Bike stumbles down q.

I found these guys that make one. I have half a mind to carry one with me across the country next summer.

https://www.highflowfuel.com/ag-1320...250fa-efi.html
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Old 11-02-2018, 10:25 AM   #12
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Re: Bike stumbles down q.

So I changed the fuel filter, but the problem didn't go away. But the strange thing, I noticed that it's doing that only when the tank is half full or less.
It will try to cut-of and stutter at any gear close to 5k and up, at 2 bars and below.
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Old 11-02-2018, 11:25 AM   #13
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Re: Bike stumbles down q.

Could it be a tank venting issue?
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2013 BMW GS 650 Sertao
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1974 Kawasaki H-1 500
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