View Full Version : Too Rich ?
05-16-2003, 05:28 PM
Just the other day someone commented that my bike smelt as though is was running rich. Admittedly it is a bit stinky (petrolly) and sometimes a bit smokey (arent all 2 strokes ? ) since then ive noticed a real strange misfiring sensation at around 5-6k which feels as though it is coming from the bottom end as i feel it thru the footpegs. I also noticed that performance has dropped off slightly but the bike idles perfectly. I have done the cdi mod and fitted the powervalve and also moved the clip on the needle to position 2 but never did air mixtures etc etc etc as i arent that competent. Has anyone any ideas ? I suspect it is too rich but i could do with a few pointers on how to lean it up a little so i dont look a twat when riding through the town in traffic and making funny noises as i go. Perhaps a new plug would suffice (br10eg in at the mo) as it hasnt been out for nearly 1000 kms and maybe air cleaners needs a wash......
Advice would be great if anyone has any for me.....
05-16-2003, 06:47 PM
I'm running a 130 main jet and my needle is near the middle
Am looking into this now will let you know my findings
I'm running arrow exhaust + perf. air filter + carbon reeds
so nothing there except air filter that might need the bigger main jet
but then again if you're running a 120 jet, I'd probably point more towards a needle setting :)
Yah also air screws might need adjusting so look into that
05-17-2003, 02:47 PM
I think i've got the same problem. My bike stinks petrolly. Gap at 5-6k (my CDI is modified). And all this started after the mechanic from my garage oiled my air filter with some special stuff which caused the carb getting less air. Though I got no time righ away to mess with it. Anyway running too rich ain't a really big problem for the bike like running too lean which can lead to an engine seizure.
What about the smoke sometimes, I think it's just a normal thing for a 2 tact engine. Especially when it's a bit colder.
05-17-2003, 05:11 PM
yah I'd like to add to this post
and ask do either of your bikes not rev out to the redline, or at least into the redline ?
My bike refuses to touch it in 6th gear, normally topping out at about 10000rpm or if I'm lucky 10500rpm
I guess this might be something to do with it running too rich
anyway cheers :)
05-18-2003, 06:28 AM
The same here. Can go hardly to the red on the 6th (excepting on a downhill maybe). But I have no powervalve. Anyway I hardly go to the red on the 6th cuz I don't like paying the tickets afterwards cuz here in Belgium they're goddamned high and u got cameras on every step. I had to pay once 280eu for drivin 70km/h where only 50k/h is allowed.
05-18-2003, 02:25 PM
"I had to pay once 280eu for drivin 70km/h where only 50k/h is allowed."
Good job the guy in Belgium who gave me a lift at 160kmh in a 50kmh hadnt got caught!
When I worked there 4 years ago Belgium was REALLY lax on speeding and drink driving
All the best
05-18-2003, 02:30 PM
Keith you got any ideas on this mate
the bike won't go into the red at all
not even past 10500 on most driving circumstances, I've got an arrows exhaust + carbon reeds + performance airfilter + denso plugs + removed more of the airbox restrictor (that two holes that dip and dive piece of rubber)
It also badly misfires between 5-6k but thats been partially fixed by tightening the airscrew slightly by 2-3 turns.
My CDI has been modded . . .
Thanks in Advance
05-18-2003, 04:58 PM
How do, i had the same problem too, runnin crap between 5-6k all restrictions done away with too and powervalve connected, i was runnin a 130 main jet and a giannelli perfomance exhaust, ran like sh*t!! so i replaced the jet with the 120 and dropped the needle one notch to 3rd from bottom, runs like a dream and fast as fu*k revs all the way to 13000 revs too!!!
05-20-2003, 05:03 AM
yah he's right in the sense that it is all in the carb
all the misfiring etc . ..
Simple way to fix it ? Go get your bike Dyno Jetted, and let a mecanic say whats ideal for your setup.
I've figured unless your a god gifted mecanic, or a damn good one at that, then you'll be hard pushed to find the right
jet/air screw/needle positioning
So off I go this afternoon to get my bike Dyno Jetted
05-21-2003, 11:03 AM
How did you get on with getting your bike dyno jetted? how much did it set you back if ya dont mind measkin.
05-21-2003, 05:03 PM
it went well
they just adjusted the air screw a bit
and moved the clip to the bottom position on my 130 main jet
it runs a lot better now than it did before
lot smoother, less power, it seems, but that could just be because of the smoothness, and no sudden jolt :)
Gonna try downsizing the jet to 125 and move the clip near the top again, and fiddle with the airscrew a bit
see what I can do
cost 80 odd quid though and I could have moved the needle clip down myself for that . . . .
05-21-2003, 05:17 PM
Surprised the jetting has had that much effect with such small changes.
The bit into the airbox probably doesnt restrict it at all (although I think I have heard that some bikes only have one of the 2 holes unblocked). Suspect it works to smooth out the air flow into the airbox.
All the best
05-21-2003, 06:02 PM
have you got any suggestions for jetting
I'm leaning on 125 jet with the needle near the top
Gixer suggested that to me, and I had the needle setting near the bottom anyway, they only moved it down one and changed the air screw a bit
made a real difference though
05-22-2003, 10:37 AM
i replaced my 130 jet with the 120 jet and moved the clip 3rd from botom position, coz with the 130 jet fitted it ran like a bag of sh*t, give it a try see how it goes............zoooooooooooooooooom
05-22-2003, 04:33 PM
Afraid not. Ages since I did any playing around with jets. You will just have to do a few plug chops
All the best
05-24-2003, 06:29 PM
Took out plug today , Black as the ace of spades so shes way too rich. How do i lean her up a bit . Does the air screw need screwing in ? On first looks it looks to be screwed pretty far out , Also in terms of moving the needle i think the clip is on the second from bottom notch on my needle so do i lean it up by moving the clip up or down )presumably moving the clip down raises the needle...
05-25-2003, 07:04 AM
Mixture is adjusted by the idle mixture screw, needle jet and the main jet.
The idle mixture screw only affects the mixture at very small throttle openings (under 1/4 throttle). You can easily adjust this.
The needle jet affects most of the throttle range, from about 1/4 to 3/4. You adjust this by moving the clip up or down the grooves in the needle. Move the clip towards the pointy end and you will richen the mixture, move it the other way to lean the mixture. Beyond that you need to buy alternative profile needles.
The main jet affects the mixture at large throttle openings. You adjust this by changing it for one of a different size.
All the best
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