1999 Curvy SV650 Carb Balance<solved> - Suzuki SV650 Forum: SV650, SV1000, Gladius Forums

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SV650 Gen1 (99-02) Tech Info, advice or questions specific to the 1999-2002 model SV650.

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Old 07-12-2019, 07:34 AM   #1
Straticus
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1999 Curvy SV650 Carb Balance<solved>

I'm posting this so it gets archived for searches.

Just cleaned and gapped my Spark plugs and treated,as I do,the Plug caps with some ACF50 inside and out and then re-balanced my carbs.

I check and do them around once a year and knew they had slipped as I was getting vibrations through the Frame/Bars at certain Revs that I don't normally get.

I decided to,"Chronicle" it this time and made a web page to help others,

https://cx500.000webhostapp.com/SV650Carb_Balance.html

"Greta" my SV650 is back to being super smooth again
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Old Today, 05:40 AM   #2
RecoilRob
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Re: 1999 Curvy SV650 Carb Balance<solved>

Have you ever checked how the valve clearance affects the synch? Mine was a bit off when I checked it first at 1500 miles and all the valve clearances were at minimums, then once they were all set to maximums the idle speed increased over 300 rpm and surprisingly the synch only needed a little tweak to get right. The TPS also was adjusted properly once the valves were set and I suspect that most of the time when people get in to fiddling with the TPS that a valve adjustment might make it right again.

I balance my TB's at 3000 which then holds true to redline while the idle will be a wee bit off...I'd rather have them balanced closer to where it'll run most of the time. You are absolutely right that the engines run sweet when they're tuned properly.
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Old Today, 06:13 AM   #3
Straticus
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Re: 1999 Curvy SV650 Carb Balance<solved>

No I've never checked the Valve clearances but the engine only has around 24,000 miles on it and uses next to no oil so it was well kept before I got it.The dealer I got it from I think checked them @ the 16k miles that were on the machine but not sure.

I go by feel.With my carbs Balanced at idle-ish speeds if I get zero vibrations through the bars/mirrors at all rev bands and full smooth power/torque and good MPG I'm happy with that

I'm hypersensitive to vibrations due to Industrial VWF(Vibration White Finger) caused by 40 years of using pneumatic hand sanders and other pneumatic hand tools so keeping my Motorcycles vibration free is of paramount importance to me.

If I was to race a Carb bike I think I would get it checked using newer technology like an Exhaust Gas Analyser and or other modern tuning devices.Vacuum carb balancers are a bit,"Old Technology" but serve their purpose within limits.

When I was 168 lbs rider weight I got a couple of 60+mpg runs which ain't too shoddy for 20+year old SV650 methinks

At present I average around 54 Mpg with some spirited riding and 190+ lbs rider weight,Struggling to lose it.Too much beer



With all things like plugs/carbs/plug caps etc all nominal the ride on these machines is superb.The sound on acceleration with my cheap slip-on is a joy only beaten by the Engine Braking deceleration sound in my Helmet and it never misses a beat



.
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Old Today, 10:24 AM   #4
free_rider
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Re: 1999 Curvy SV650 Carb Balance<solved>

checking "synch" of the carbs. or throttles is such a pain, especially the hook ups and getting the engine to run at a consistant speed! I've gone to the method of just using eye sight and how much light shines through the throttles when closed and when partially opened. Takes a lot of the "pains" out of the process... sure there are other factors in the synch, but most important is that they are opening at the same rate... if you have other engine issues... there are other ways of fixing and checking for those problems... end note!.

Oh, and the secondary throttle valve on the carbed SV is opened by spring tension! (with the stock carbs). I recently modified a fixed method for the secondary carb. to open... I should have done a bit of a show and tell on this! basically I drilled and tapped the secondary throttle linkage for a screw and removed the spring! (I didn't see the point in having a spring open the 2nd throttle!, especially not for accuracy!)

Quote:
Originally Posted by Straticus View Post
I'm posting this so it gets archived for searches.

Just cleaned and gapped my Spark plugs and treated,as I do,the Plug caps with some ACF50 inside and out and then re-balanced my carbs.

I check and do them around once a year and knew they had slipped as I was getting vibrations through the Frame/Bars at certain Revs that I don't normally get.

I decided to,"Chronicle" it this time and made a web page to help others,

https://cx500.000webhostapp.com/SV650Carb_Balance.html

"Greta" my SV650 is back to being super smooth again
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Old Today, 02:32 PM   #5
RecoilRob
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Re: 1999 Curvy SV650 Carb Balance<solved>

Quote:
Originally Posted by free_rider View Post

Oh, and the secondary throttle valve on the carbed SV is opened by spring tension! (with the stock carbs). I recently modified a fixed method for the secondary carb. to open... I should have done a bit of a show and tell on this! basically I drilled and tapped the secondary throttle linkage for a screw and removed the spring! (I didn't see the point in having a spring open the 2nd throttle!, especially not for accuracy!)

The spring of a CV (constant velocity) carb holds the slide closed while an air pressure differential is created by airflow underneath the slide that acts on the large bellows above to lift the slide when more airflow is needed. You CAN run the slides manually....but will have to be careful with the throttle to not open too far too fast or it'll bog as the airflow stagnates. The stock CV is very forgiving and why they were so popular before FI became commonplace.
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