June 24th, 2012, 10:07 AM | #1 |
ninjette.org guru
Name: Toua
Location: Long Beach
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Anyone experienced this after shimming?
So I finished shimming my carbs yesterday and went on a 2 hour ride this morning to see how it is. I noticed a lack of power right at 7k rpm to 10k rpm. Anyone experienced this? You can seriously feel the lack of power right when you reach 7k rpm and it slows down (like its struggling) and then once you hit 10k rpm, it runs normal again. Took the freeway home and in 6th gear, im riding around 8k to 9k rpm and again, feels like there's no power. Everything else was done recently too a couple weeks ago (new oil, spark plugs, oil filter, brand new Uni air filter) it ran fine until i did the shimming and i KNOW i did everything right. Any suggestions?
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June 24th, 2012, 10:48 AM | #2 |
ninjette.org certified postwhore
Name: Jason
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How many shims?
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June 24th, 2012, 10:52 AM | #3 |
ninjette.org guru
Name: Toua
Location: Long Beach
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I have a slip on exhaust so I used the recommended two #4 washers on each needle.
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June 24th, 2012, 10:57 AM | #4 |
ninjette.org sage
Name: Andy
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Did you adjust your fuel mixture screws as well?
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June 24th, 2012, 11:03 AM | #5 |
ninjette.org guru
Name: Eduardo
Location: Hollywood, Calirfnia
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Try 3 on each needle see how you like that. Tweak the fuel mixer screws too. I know it's a hassle doing it all over again
Have you removed the snorkle? IF you have not remove it and try it like that before you re-shim. |
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June 24th, 2012, 11:21 AM | #6 |
wat
Name: wat
Location: tustin/long beach
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raising the needles with shims gives more gas in mid range. people equate more gas with more power. the lack of power you are experiencing is too much gas because the needles are too high letting out too much gas too soon making it run rich until it gets more air up top. adding MORE shims, will make it worse.
take the shims out. people who blindly say to shim without changing anything else don't know what they are talking about.
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June 24th, 2012, 11:23 AM | #7 |
Frak It
Name: Sean
Location: SWFL
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I would remove the snorkel before anything else if you haven't done it already. It's the easiest thing to do before attempting further modifications.
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June 24th, 2012, 11:34 AM | #8 |
wat
Name: wat
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if removing the snorkel adds more air, and he has stock main jets, it may fix his mid range, but then his top end will be lean. and a lean top end is a lot worse than a rich midrange.
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June 24th, 2012, 11:49 AM | #9 |
KThanksBye
Name: Kevin
Location: Orange County
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Take the snorkel out, you will be fine
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June 24th, 2012, 11:56 AM | #10 |
ninjette.org member
Name: Drew
Location: Canada
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Try this, it may help.
I originally had a slip on exhaust and it ran okay with a lot of popping when accelerating, and then I decided to pull my snorkel and had the same problem you had. I added 3 washers per jet(or needle?) and it fixed the problem.
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June 24th, 2012, 12:00 PM | #11 |
KThanksBye
Name: Kevin
Location: Orange County
Join Date: Mar 2011 Motorcycle(s): 2006 zx636r Posts: A lot.
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You are running rich, there is no doubt about that. What is causing it to run so rich? Probably not the washers, unless you put some massive washers in there. Double check your work and make sure everything is hooked up correctly
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June 24th, 2012, 12:01 PM | #12 |
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Name: Sean
Location: Middle TN
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Yep I had a similar problem and thought removing the snorkel would help, but didn't. Anyways, I took a washer out (only 1 now) and it runs fine.
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June 24th, 2012, 12:07 PM | #13 |
KThanksBye
Name: Kevin
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June 24th, 2012, 03:36 PM | #14 |
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Thanks everyone and Kevin for the link. I removed snorkel and now it runs great!
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June 24th, 2012, 05:38 PM | #15 |
wat
Name: wat
Location: tustin/long beach
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if you do a plug check you'll notice the plugs start to burn up a nice white color from your system running lean up top now.
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June 24th, 2012, 08:33 PM | #16 |
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June 24th, 2012, 08:35 PM | #17 |
KThanksBye
Name: Kevin
Location: Orange County
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June 26th, 2012, 12:52 PM | #18 |
wat
Name: wat
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i drew this graph for someone else but figured it might be useful to the board...
vertical represents how much fuel the carbs let out, horizontal is how much vacuum the engine is sucking (can be thought of as throttle position) the two lines on the left represent stock, and a richer pilot jet, and the two on the right represent stock, and richer main jets. it was drawn to illustrate why you need to change jets when you change exhaust or intake flow but it applies to any shimming really. you can also see the "low-end power loss" people talk about when dealing with pod filters because they dont bother changing their pilot jets.
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June 26th, 2012, 01:02 PM | #19 |
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Name: Shawn
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I have a slip-on and i used TWO 3mm washers on each needle. my rig run perfect even with 10k miles on it.
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June 26th, 2012, 01:11 PM | #20 |
ninjette.org guru
Name: Toua
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I'm just going to take out one shim each Carb. I'm not liking the way its running though its nice low end. It seems to struggle around 7k rpm. I gunned it earlier and had a burnt smell. I have no clue why
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June 26th, 2012, 01:22 PM | #21 |
Dakine...
Name: AJ
Location: DFW
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just remember, though our bikes are generally the same, each will be different. some will be fine with 1 shim, others 2 or 3. let us know how it does when you have just one shim on and we'll be glad to further assist you.
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June 26th, 2012, 01:27 PM | #22 |
wat
Name: wat
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it depends on atmospheric conditions. but im worried that you guys completely missed the point of my drawing. shims are not a good solution to anything.
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June 26th, 2012, 05:55 PM | #23 | |
ninjette.org member
Name: Joe
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Quote:
If you leave the snorkel out, no matter what you do you'll still be lean up top. Listen to alex.s he knows what he's talking about and is actually trying to help you.
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June 26th, 2012, 09:59 PM | #24 |
ninjette.org guru
Name: Toua
Location: Long Beach
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Yeah I agree. I took one out from each. If I don't like it ill just set everything back to the way it was. It was a pain. I'm too lazy to ride it now.. just got done like 5 mins ago. Will update tomorrow
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June 27th, 2012, 08:01 AM | #25 |
ninjette.org guru
Name: Toua
Location: Long Beach
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Well.. I just got to work and it feels fine now though there was a brief moment where I was smelling gasoline but its probably from when I disconnected the hose last night. So one washer in each seems to be working well.
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June 28th, 2012, 03:31 PM | #26 | |
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Quote:
This is how I imagine you: |
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