SuzukiSavage.com - No torque at higher RPMS

gdrseeker

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No torque at higher RPMS
10/30/12 at 09:36:50

Just put in a new Carb rebuilt from Lancer. I have no torque at the higher RPMS like I did before. Is it just a matter of fine tuning what main and pilot jets to use and the correct turns out on the air mix screw.

This is what Lancer sent me

I installed a #52.5 pilot with the pilot screw set at 1.5 turns out as a starting point for you.
The white spacer was replaced by 3 washers.
A #152.5 main jet is installed.
The carb was totally disassembled and cleaned and checked.
I also included extra jets: #50 & 55 pilot as well as #147.5, 150 & 155 main jets.

I believe you said you had a Jardine muffler, and if so then you may need to go up on the pilot and /or main jet, but you won't know until you get it together and test it,

Just holler if you need help with tuning

Michael

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1996 Savage, Jardine, K&N, 145 / 55 jets, 1 turn out at 5000 ft. elevation.

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: No torque at higher RPMS Reply #1 - 10/30/12 at 09:39:52 I believe you said you had a Jardine muffler, Do you? and if so then you may need to go up on the pilot and /or main jet, but you won't know until you get it together and test it, Have you?
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Dave

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Re: No torque at higher RPMS
Reply #2 - 10/30/12 at 09:50:48

The mixture screw has almost no effect on high rpm power - it sets the idle mixture and has little effect beyond 1/8th throttle. The Pilot Jet has an affect from about 1/8th throttle to 1/4th, the Needle has affect from about 1/8th throttle to 3/4 throttle, and the main has an affect from 3/4 or more. There is a bit of an overlap from one jet to another......but generally that is the way it works for me.

Have you checked to see that the throttle cable is attached correctly and opening the carb butterfly properly?

What kind of elevation (MSL) do you live and ride at?

When you notice the power drop.....is the engine surging and running uneven (lean)....or does the engine still run smooth?

Why was your carb rebuilt and rejetted? Was it because of the muffler change?

Did you contact Lancer for the help he offered in jetting?

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gdrseeker

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Re: No torque at higher RPMS
Reply #3 - 10/30/12 at 10:37:10

I have not gone up on the pilot jet or the main jet yet. That was my plan but I wanted to get feedback as to which one to change or both??

Ran fine with the stock muffler at 145 main and 52.5 Pilot.

Yes I have the Jardine muffler now.
I started to make adjustments after I put on the Jardine.

I got the rebuilt carb because the fuel / air mix screw was messed up and when I tried to remove to replace it I screwed it up so bad it was toast.

I live at 5000 Feet.

The engine seems to run smooth each gear at the lower portion of the throttle, as I throttle up it just doesn't seem to get any power, it seems to continue smooth but just raises the RPMS and not the speed / torque .

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1996 Savage, Jardine, K&N, 145 / 55 jets, 1 turn out at 5000 ft. elevation.

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gdrseeker Senior Member Offline Addicted!! Posts: 365 Carson Valley NV	Re: No torque at higher RPMS Reply #4 - 10/30/12 at 10:39:22 I am going to change out to the 155 Main and see how it feels.
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Dave

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Re: No torque at higher RPMS
Reply #5 - 10/30/12 at 11:30:24

gdrseeker wrote on 10/30/12 at 10:39:22:

I am going to change out to the 155 Main and see how it feels.

Because of your altitude....I believe you are already too rich. The thinner air requires less fuel at altitude and you need to drop the jet sizes. I would drop to the 150 first and see how that works. If you do install the 155 and things stay the same or get worse......at least you will know where to go next.

I am between 500 and 800 feet where I ride, and I have a #50 Pilot, a 150 Main, 2 washers on top of the needle, and I have a Dyna Muffler and a stock air filter. I had 3 washers on top of the jet needle at first, then found I had a lean stumble just off idle - it was corrected when I took one more washer out.

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: No torque at higher RPMS Reply #6 - 10/30/12 at 11:32:11 gdrseeker wrote on 10/30/12 at 10:37:10: The engine seems to run smooth each gear at the lower portion of the throttle, as I throttle up it just doesn't seem to get any power, it seems to continue smooth but just raises the RPMS and not the speed / torque . As in rpms pick up but speed doesn't?
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gdrseeker Senior Member Offline Addicted!! Posts: 365 Carson Valley NV	Re: No torque at higher RPMS Reply #7 - 10/30/12 at 11:36:51 Correct RPMS go up but bike doesn't get the surge or torque it did before it picks up speed slowly just not responsive. Just put in the 155 I will see what happens going for a ride around the block.
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28663 Tucson Az Gender:	Re: No torque at higher RPMS Reply #8 - 10/30/12 at 11:36:56 Dave's gotcha'... he's giving good advice... #155 is a lot of jet for 5k elevation... Try the #150... Take it away Dave... ...
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gdrseeker Senior Member Offline Addicted!! Posts: 365 Carson Valley NV	Re: No torque at higher RPMS Reply #9 - 10/30/12 at 12:05:50 155 was worse ...... Trying the 150 now.
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gdrseeker

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Re: No torque at higher RPMS
Reply #10 - 10/30/12 at 12:54:09

Tried 150 then 147.5 and now 145 got better with each.

I now am at 145 main and 52.5 Pilot, three washers on the needle, and 1 turn out on the air/fuel mix screw. Only minor pops on deceleration.

Things seem good but not as much power / torque as I had before.

Not sure if I should change the pilot. or mess with the needle?

Going for a ride out of town and back for a total of 100 miles I will see how she acts.

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1996 Savage, Jardine, K&N, 145 / 55 jets, 1 turn out at 5000 ft. elevation.

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Dave

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Re: No torque at higher RPMS
Reply #11 - 10/30/12 at 13:12:27

I would drop the Pilot as well.......and keep dropping it until you can't make the idle too rich at 3 turns out. If you can make the engine too rich at idle with something less than 3 turns....the pilot is probably fine.

You may also be too rich on the needle with 3 washers.....you are up in the clouds and don't need as much fuel as us 'bottom feeders".

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heroicseven Full Member Offline oops, I broke it. Posts: 245 San Diego Gender:	Re: No torque at higher RPMS Reply #12 - 10/30/12 at 13:37:40 Clutch springs?
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gdrseeker Senior Member Offline Addicted!! Posts: 365 Carson Valley NV	Re: No torque at higher RPMS Reply #13 - 10/30/12 at 14:13:58 Got on the highway and no power past 45 mph. No get up and go to pull out in traffic. Can't ride to my appointment like the. I will drop to lower pilot and change the needle washers when I get home. Thanks for the input so far.
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: No torque at higher RPMS Reply #14 - 10/30/12 at 14:50:47 You got the slider out with your greasy mits. Did you clean it before you put it back in? Slide is very sensitive to dirt, I hope you're not.
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