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Might be a fueling issue. RPM question.

  • Thread starter Thread starter cal_look_zero
  • Start date Start date
C

cal_look_zero

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So being used to a bike that will hit 17k rpm in about .9 seconds with a smile on it's face, I'm wondering what the RPM range should be on the GS. This is in neutral, kickstand down; I wish it was rideable already.

Anyhow I can get it to redline, but that's WFO and it seems to not like going from 7500-9k and absolutely will not go above 9k. And no, I wasn't just sitting in my driveway holding it at redline, but I did want to see how high up it went, or if it totally loses it's ass at high rpms.

1750-7500 is smooth as butter though. Can't wait to test it under load to see that all go to hell in a handbasket, lol

On a somewhat related note, when I wrapped it to 9k and chopped the throttle, it dropped to 1200, sputtered, and died. Fuel starve?

105 mains, stock exhaust, pods. 1 7/8 turns on air screw, 1 turn on fuel screw, no choke.
 
So, what do your plugs look like?

That motor should pull smoothly past redline
 
Hi,

Yes, my first thoughts are fuel starvation and perhaps the valve clearance.


Thank you for your indulgence,

BassCliff
 
Hm... Sounds like I need to locate a set of 107.5 mains. I put 110s in and it bogged out and died under load. Valves are good, haven't checked the plugs yet, but when I pulled them prior to trying the 110s they were a nice light brown except #2 which was nice and oily from the blowby I had.

I noticed a lean condition (maybe) on my #1 cylinder, it was running a good 60* hotter than the other 3 and had what looked like a miniscule smoke **** from the head gasket.
 
How can you do plug chops if the bike is not rideable? :-k

You have to get it on the road and hold specific throttle settings to get proper readings on the plugs.

RPM range? Mine all idle smoothly at about 1100 and will go readily to redline. I tend to keep the revs lower than most, most of my running is under 5000. Be aware that there are TWO power ranges with this bike, though. It is a mild commuter bike with respectable power below 6000 RPM, but take it above that, you will think that somebody switched the cams on you. There is a noticeable surge in power up to redline. Probably not nearly as much as you are used to, but it will scoot along just fine. :D

.
 
Steve said:
How can you do plug chops if the bike is not rideable? :-k

You have to get it on the road and hold specific throttle settings to get proper readings on the plugs.

RPM range? Mine all idle smoothly at about 1100 and will go readily to redline. I tend to keep the revs lower than most, most of my running is under 5000. Be aware that there are TWO power ranges with this bike, though. It is a mild commuter bike with respectable power below 6000 RPM, but take it above that, you will think that somebody switched the cams on you. There is a noticeable surge in power up to redline. Probably not nearly as much as you are used to, but it will scoot along just fine. :D

.
Click to expand...

Track terminology. Chopping the throttle means to take it from WFO to closed. Typically used in reference to an epic high side.

"That noob chopped the throttle when his rear end stepped out, and yardsaled his whole f****n kit"

Carbs clearly need a fair amount of work. No big deal, just keeping busy until I can afford parts to make it roadworthy.
 
While I would not call it track terminology (I have been chopping the throttle since I started riding/driving in the 60s) Steve confused it with plug chops, which is reading the plugs after a specific type of run, used in tuning the carbs.
Since you already know how to read plugs, it should not be an issue once the bike is rideable enough to fine tune the carbs.
Since it clearly has fueling issues, I have to ask: Have you done the CV carb cleaning/replacing o-rings work yet? If not, that should be your first step. Including fuel bowl gaskets, it may set you back ~$30 plus shipping. Also check the o-rings at the head; they should be replaced if you have not already done so.
Just some thoughts.
 
Get the bike running on the road and then judge. Reving the bike in neutral provided no meaningful information.
 
koolaid_kid said:
Steve confused it with plug chops, which is reading the plugs after a specific type of run, used in tuning the carbs.
Click to expand...
No, I didn't really confuse it, I just wanted to make sure that he wasn't confusing "chopping the throttle" while sitting in the driveway with a proper plug chop to read the color on the plugs. :o

.
 
To answer your first question it should rev from idle to way way past redline in about .6 seconds or so.
 
Thanks for the input.

Ness: I think the fact that it won't go above 9k provided a lot of useful information. Information that tells me I may have had some settings off when I put the 110s in.
 
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