SV650.org - SV650 & Gladius 650 Forum



SV Talk, Tuning & Tweaking Discussion and chat on all topics and technical stuff related to the SV650 and SV1000
Need Help: Try Searching before posting

Reply
 
Thread Tools
Old 13-06-18, 07:03 PM   #1
pedro3178
Junior Member
 
Join Date: Jun 2018
Posts: 11
Default 2001 SV650S issues

Hey all ,

Sorry to start my first post with an issue but i am new to biking having only recently passed my mod 2 .

I bought myself a 2001 Suzuki SV650S in extremely good condition and have enjoyed riding her , well , when she's not ill! lol

I have recently changed the rectifier due to it having a short and frying my battery , been out in her a few times now after that with no issues at all but today when i went to take her for a spin i suddenly lost power, i was only out for 5 mins, came to my first bit of straight road and opened her up, i noticed the revs fall and thought maybe i pushed her too hard but then noticed i had hardly any power and couldn't get above 3-4 in the revs , its as if she's in limp mode.

I have since stripped her down and checked the ignition coils and spark plugs , i get the same reading from the coils and both plugs give a spark .

Could someone please advise on what else i could test for

Cheers
pedro3178 is offline   Reply With Quote
Old 14-06-18, 07:18 AM   #2
Seeker
Member
 
Join Date: Jun 2016
Location: NE Lincs
Posts: 368
Default Re: 2001 SV650S issues

Hi pedro, welcome to the forum.

Not too much to go on but I'll throw in a few ideas. The carbed SV (curvy) does not have a limp mode. If you don't have a manual you need to get one.

Since you have already had some charging issues and since the SV is fussy about low voltage, what is the battery voltage with the engine running, you should be getting around 14V dc.

The SV can drop onto one cylinder, usually caused by the front cylinder spark plug being immersed in water because its drain hole is plugged with dirt. It will run on one cylinder but the throttle response is awful (duh!) and the engine sounds "flat", not crisp like normal. Does your SV tickover/idle smoothly?

I know you said you had a spark but how old are your plugs?
You also said you "get the same reading from the coils" - the primary resistance is 3.5-5.5 ohms and the secondary is 20-31 k ohms (measured to plug cap). Coils can break down with heat although this would tend to start with a misfire.

What else? If something is obstructing the airflow it would strangle the revs - a collapsed airfilter (rare) - there used to cases of the SV swallowing bits of foam from its airbox causing airflow restrictions.

The curvy uses vacuum to operate the fuel tap and also pump petrol into the carbs if the rubber membranes in these items are perished and petrol flow is reduced it would limit revs. Suzuki's manual has tests for these devices, I don't know whether the Haynes manual does or not.

I don't think this is a mechanical issue because you haven't mentioned any odd noises coming from the engine, but if you had lost compression on one cylinder, it would cause similar symptoms. (you could do a compression test if you were worried).

... and I'm out of ideas...good luck
Seeker is offline   Reply With Quote
Old 16-06-18, 07:53 AM   #3
pedro3178
Junior Member
 
Join Date: Jun 2018
Posts: 11
Default Re: 2001 SV650S issues

Many thanks for the above reply.

I will try adding more information.....


I first got this issue when I red lined her, the Rev limiter kicked in and since then I now have this issue. I have fitted brand new spark plugs, I checked the drain hole with a small bit of wire , my battery is around 14v while charging and since changing the rectifier doesn’t get warm anymore. My idle isn’t great at all , it’s certainly not smooth, normally when starting from cold I would give some choke for a bit then take it off , she would sit around 1500 , now it can go to around 1000 and doesn’t sound stable. My coils from memory were 5. Something and 20. Something on ohm test on both , my fuel lines all feel ok and visual inspection looks good but I have not removed any hoses.
I have had the air box off and air filter out, all looked ok and I double checked air box was seated correctly when putting back together by keeping air filter out and checking rubber seals secured first.

Think that’s all I can think of ? I feel it’s linked with what happened with the Rev limiter but have no idea what that could have caused

Meant to also say, I don’t hear any strange noise from the engine

Last edited by pedro3178; 16-06-18 at 09:00 AM.
pedro3178 is offline   Reply With Quote
Old 16-06-18, 09:53 AM   #4
Seeker
Member
 
Join Date: Jun 2016
Location: NE Lincs
Posts: 368
Default Re: 2001 SV650S issues

Quote:
Originally Posted by pedro3178 View Post
My coils from memory were 5. Something and 20. Something on ohm test on both
That's a bit too vague to evaluate but I don't think this is a coil problem.

I think I would fit new plugs first.

While I was changing the plugs I would do a compression test - this requires a tool; a gauge. The gauge either screws in or pushes into the plug hole, the engine is turned over on the starter a few times until the reading stabilises. It is normally done on a warm engine with the throttle wide open. Here's a brief video showing the procedure (the engine does not need to be removed for this test) and you don't need two gauges.

https://www.youtube.com/watch?v=mbmQwqeXgJE

What you are looking for is similar pressures (within 10%) on both cylinders and I think the minimum is 156 psi.

This test will tell you whether you have any mechanical damage in the engine . Since you have an uneven idle and you've lost power, it would be worth checking.
Seeker is offline   Reply With Quote
Old 17-06-18, 03:35 PM   #5
pedro3178
Junior Member
 
Join Date: Jun 2018
Posts: 11
Default Re: 2001 SV650S issues

just an update and to also confirm that i did fit a brand new set of spark plugs.

I have done some compression tests and will post up pics of the results and also my battery with engine off then engine on.


Engine off...



Engine on...




Front cylinder test -



Rear cylinder -

pedro3178 is offline   Reply With Quote
Old 17-06-18, 04:12 PM   #6
Seeker
Member
 
Join Date: Jun 2016
Location: NE Lincs
Posts: 368
Default Re: 2001 SV650S issues

The charging cct looks fine.

The cylinder pressures are a bit lower than I would have expected - did you do it on a warm engine with the throttle wide open? Might be the meter - still, they are above minimum and are pretty well balanced, so it doesn't look like a mechanical issue.

I think the next step would be to take a look at the carbs and the fuelling with a view to looking for dirt which may have caused a jet blockage and see if there's any obstructions to the airflow. Once you've removed the airbox and before you remove the carbs you can check that the butterflies move freely. They are CV (downdraft) carbs so the throttle slide and needle (under the black carb cap) float up and down depending on vacuum. There have been the odd case of the needle being loose on the slide - it normally wobbles but shouldn't slide freely in and out of the slide.

There are some tests in the Suzuki manual for the fuel pump.

Note that the carb screws are JIS - they look like Philips but are cut at a different angle, a Philips screwdriver will mangle the heads.

Some people swear by "seafoam" for cleaning the fuel system (with the engine running - you put it in the fuel tank). I've never tried it so I can't vouch for how effective it is.

If all this fails then you're down to coils which I said earlier that I didn't think were the problem. The issue with coils is that you can check their static resistance which is a basic test but to test to see if they're breaking down under high voltage or heat requires an oscilloscope and a high voltage probe, which only leaves substitution. Fortunately, there a few inexpensive ones on ebay if necessary but I would take a look at the carbs next.

Quick question - you said that the idle isn't stable - is one cylinder cutting out?

Last edited by Seeker; 17-06-18 at 04:17 PM.
Seeker is offline   Reply With Quote
Old 17-06-18, 04:40 PM   #7
Seeker
Member
 
Join Date: Jun 2016
Location: NE Lincs
Posts: 368
Default Re: 2001 SV650S issues

A couple of more thoughts - check the fuel filter in the vac petrol tap and check the choke plungers aren't sticking and, while you're in there, check the TPS. This guy had a similar problem a few years back with no conclusion unfortunately:

https://forums.sv650.org/showthread.php?t=207922

Last edited by Seeker; 17-06-18 at 04:50 PM.
Seeker is offline   Reply With Quote
Old 17-06-18, 05:54 PM   #8
pedro3178
Junior Member
 
Join Date: Jun 2018
Posts: 11
Default Re: 2001 SV650S issues

Thanks for your help.

I will check what you have suggested but i don't fancy tackling the carbs so might send her in for that if it comes to it.

I will put a link for youtube on her running, on the video that i show the rev counter the loud click/pop you hear is from the exhaust , its a sports exhaust on her ( previous owner ) it has always made pops and noises when you come off the throttle but now its when your using throttle , the second vid gives a better idea as you can hear it when I'm revving the engine.

https://youtu.be/wr0N_e7l8t8

https://youtu.be/3P8QYqPIzAA

I have no idea if one cylinder is cutting out , both downpipes do get extremely hot when only running her for 5 mins or so.

I know in the end i will probably have to put her in to the garage but i thought if i can rule out simple things and keep a list ,at least i will possibly save a few hours labour

Last edited by pedro3178; 17-06-18 at 05:56 PM.
pedro3178 is offline   Reply With Quote
Old 17-06-18, 06:06 PM   #9
pedro3178
Junior Member
 
Join Date: Jun 2018
Posts: 11
Default Re: 2001 SV650S issues

I meant to say, I removed air box and checked both butterfly’s , they both seem to move back and forth as they should
pedro3178 is offline   Reply With Quote
Old 17-06-18, 06:37 PM   #10
Seeker
Member
 
Join Date: Jun 2016
Location: NE Lincs
Posts: 368
Default Re: 2001 SV650S issues

Popping on the over run is not unusual with an aftermarket pipe - usually a sign of a slightly weak mixture - a lot of riders like it.

Regarding the popping/misfiring on a steady throttle (second youtube vid) - do you have a strobe light? If so I'd be curious to see what happens if you hooked it up to each cylinder in turn and see if you lose a strobe pulse in time with the misfire.
Seeker is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
SV650S K9 Battery Charging Issues. morgoth SV Talk, Tuning & Tweaking 3 22-03-16 03:25 PM
2002 sv650s starting issues twinblades Bikes - Talk & Issues 2 01-03-16 10:59 AM
SV650S K2 running issues jammin32 Bikes - Talk & Issues 11 16-12-08 08:03 PM
New SV650S Owner , some issues TheShadow SV Talk, Tuning & Tweaking 6 03-03-08 09:54 AM
06 sv650s clutch issues xtrm SV Talk, Tuning & Tweaking 6 30-01-08 03:56 PM


All times are GMT. The time now is 03:31 AM.


Powered by vBulletin® - Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.