Author Topic: High rev hesitation / holding back (Read 7166 times)

garth · « **on:** February 07, 2017, 19:56:08 »

It seems that when I use full throttle in the upper end of the rev range (7k up) my wee holds back a little. If I back off the throttle it seems OK.

I haven't revved it that hard previously so only just noticed.

Any ideas? TPS? Fuel filter blocked?

Runs fine on partial throttle, you would never notice any hesitation unless you're going full potato.

SuzukiSte · « **Reply #1 on:** February 07, 2017, 19:59:52 »

Are you hitting the rev limiter?

garth · « **Reply #2 on:** February 07, 2017, 20:07:45 »

Nope.

Fat Rat · « **Reply #3 on:** February 07, 2017, 20:10:29 »

Search the site for high pressure filter.

Fat Rat · « **Reply #4 on:** February 07, 2017, 20:14:17 »

Try this http://www.v-strom.co.uk/smf/index.php?topic=28671.0

garth · « **Reply #5 on:** February 07, 2017, 20:35:41 »

Interesting. Just to add, bike been standing for 1 year or more. I suppose first step is fuel pump flow test, then if poor, remove pump and check if filter is buggered?

Pattern complete pumps for £20 on eBay.

greywolf · « **Reply #6 on:** February 07, 2017, 21:01:00 »

In almost every instance, the cause of a low flow is a clogged high pressure filter. The most cost effective remedy is an external filter modification. http://www.vstrom.info/Smf/index.php/topic,6105.0.html

The typical under $100 replacements are really only motors and that is rarely the problem.

garth · « **Reply #7 on:** February 07, 2017, 21:12:52 »

I gathered that I couldn't do a mod as mine is a later bike.

I also thought I needed a new teabag type filter - I only mentioned the £20 kit as this is included with it.

Fat Rat · « **Reply #8 on:** February 07, 2017, 21:32:19 »

Garth,

The link I posted was also a bike that had been standing. It is also worth noting that changing the high pressure filter (£100) fixed the issue BUT the root cause was later identified as rust in the tank.

greywolf · « **Reply #9 on:** February 07, 2017, 22:03:49 »

There are instructions later in the thread for K7 and later 650s. The teabag filter is just a strainer to keep out large particles. The high pressure filter is higher and in the same housing as the regulator, #7 in the diagram.

garth · « **Reply #10 on:** February 08, 2017, 06:36:18 »

I'm a touch confused.

It appears you bought a complete housing for £100, but then changed the filter inside the old housing with an £8 pattern one?

Surely the plastic housing will be fine and it's just the filter I need to change?

I will change the strainer on the pump also while I'm in there.

garth · « **Reply #11 on:** February 08, 2017, 07:27:00 »

Or is the HP filter thing, #7, one complete unit and unserviceable, and the £8 filter you mentioned, the strainer?

Aside from these issues I'm having, bike is nice to ride. Relaxing even.

Fat Rat · « **Reply #12 on:** February 08, 2017, 11:11:50 »

The strainer will catch the large pieces of crud but it is the high pressure filter #7 that gets blocked and can't be cleaned.

garth · « **Reply #13 on:** February 08, 2017, 11:34:38 »

What a bastard.

Fat Rat · « **Reply #14 on:** February 08, 2017, 11:49:32 »

Please don't use the quote button when replying to a post directly above

I would recommend a fuel flow test.

garth · « **Reply #15 on:** February 08, 2017, 16:18:43 »

I will do a flow test first.

Problem is getting worse. If I use full throttle from say 3,000rpm, it will pull clean to maybe 6,000 and then hesitate, hold back from then on.

garth · « **Reply #16 on:** February 13, 2017, 13:40:54 »

Quote from: greywolf on February 07, 2017, 21:01:00

In almost every instance, the cause of a low flow is a clogged high pressure filter. The most cost effective remedy is an external filter modification. http://www.vstrom.info/Smf/index.php/topic,6105.0.html

The typical under $100 replacements are really only motors and that is rarely the problem.

Could someone please quote the relevant post for the mod on the 2007+ bikes? I can't open the page, all I get is an error.

"Constant VS_MAKE already defined
File: /usr/sites/common/consolidated-footers/footers/vstrom.info.smf.html
Line:"

greywolf · « **Reply #17 on:** February 13, 2017, 14:18:28 »

VSRI had a database problem recently that seems to be fixed now. See http://www.vstrom.info/Smf/index.php/topic,6105.0.html with the relevent section on 2007 and later 650s starting with post 231.

garth · « **Reply #18 on:** February 13, 2017, 17:12:04 »

Nope it won't work for me!

Fat Rat · « **Reply #19 on:** February 13, 2017, 17:23:03 »

Garth,

From what I read, the mod to the 2007> is a bit hit and miss.