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GS650 - can't go faster than 50mph - what gives?

  • Thread starter Thread starter Fenixgoon
  • Start date Start date
mike_of_bbg said:
I think your last note indicates the problem. The coils are supposed to fire 1&4 and 2&3 together. If you have 1&2 and 3&4 on the same coils, you're only firing on two cylinders. Switch the wires for 2&4.
Click to expand...

ok, just switched 2 and 4 wires.

edit: idled a little more, 3 and 4 are firing (exhaust pipes are nice and hot), 1 and 2 are cool :confused;

also, there was smoke coming from my right exhaust pipe o.O (like from the very, very end). is it from all the unburnt stuff building up in my cats?
 
Last edited:
Is that just idling, or does #2 heat up if you open throttle? If you still haven't sync'd your carbs, #2 could just be very closed at idle. That may also be why #4 is taking a while to heat up. Is the #2 plug wet with gas when you remove it?
 
mike_of_bbg said:
Is that just idling, or does #2 heat up if you open throttle? If you still haven't sync'd your carbs, #2 could just be very closed at idle. That may also be why #4 is taking a while to heat up. Is the #2 plug wet with gas when you remove it?
Click to expand...

opened the throttle up to about 2000 rpm and still nothing from 1/2. definitely some smoke coming from 3/4 during operation - means i'm running too rich?
 
So #1 was working until you switched the plugs for #2 and #4? Are you getting a strong spark there? Looks like there's been some wire work judging by the picture of your coils. Again - plugs wet with/smell like gas? Are you getting any gas in there?

What color is the smoke? White? Probably gas if it is. Sounds like you're either rich or leaking on that side.
 
mike_of_bbg said:
So #1 was working until you switched the plugs for #2 and #4? Are you getting a strong spark there? Looks like there's been some wire work judging by the picture of your coils. Again - plugs wet with/smell like gas? Are you getting any gas in there?

What color is the smoke? White? Probably gas if it is. Sounds like you're either rich or leaking on that side.
Click to expand...

plug 1 was definitely wet. nothing really covering plug 2.

and yeah, the smoke was white-ish.
 
Sounds like you're not getting spark on #1; can you verify that? #2 carb is not letting fuel through, and either #3 or #4 (or both) is running very rich and/or is leaking past the inlet o-rings.

I know you said you cleaned the carbs. Elaborate. You followed the instructions per the CV carb rebuild guide? Dipped for at least 24 hours? Installed new o-rings? Any other parts replaced?

The racing idle sounds like a vacuum leak. Did you replace the intake boot o-rings? Were the boots in good condition? You're using the correct vacuum petcock with no leaks? And if you're not, the vacuum tap on carb #2 is plugged?
 
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