using dwell meter for tuning carbs
- Gdailey2112
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using dwell meter for tuning carbs
23 Jul 2022 11:29
curious, which wire do connect dwell up to? lmk please
thanks!!
thanks!!
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- Warren3200gt
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Re: using dwell meter for tuning carbs
23 Jul 2022 11:49 - 23 Jul 2022 12:03
A dwell meter has nothing to do with tuning carbs. It measure the amount of degrees the points are closed to optomise coil charge. One wire to the points arm spring, the other to earth. Depending on which meter you have you'll need to do some maths as they are really not designed for wasted spark ignitions. The sum will depend on what you set the meter up to measure.
Last edit: 23 Jul 2022 12:03 by Warren3200gt.
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Re: using dwell meter for tuning carbs
28 Jul 2022 16:06
thanks for your reply!! I thought a dwell meter on the tach side would be sensitive enough to note the slight changes in RPM, therefore able to better set my pilot screws? Is this not true? thanx again. Very curious and it's about learning correctly for me.
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Re: using dwell meter for tuning carbs
28 Jul 2022 16:19
thanks for your reply!! I've lost 60% of hearing, recently learned that a dwell meter on the tach side would be sensitive enough to note the slight changes in RPM, therefore able to better set my pilot screws? Is this not true? thanx again. very curious to know and it's about learning correctly for me.
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Re: using dwell meter for tuning carbs
28 Jul 2022 16:31thanks for your reply!! I've lost 60% of hearing, recently learned that a dwell meter on the tach side would be sensitive enough to note the slight changes in RPM, therefore able to better set my pilot screws? Is this not true? thanx again. very curious to know and it's about learning correctly for me.
Why not try and see? Start with the pilot screws at 2.5 turns open, then tune from there for the highest rpm. If you don't see the rpm change with adjustment, stay near 2.5. After everything is properly adjusted, all carbs should be within 1/2 of each other.
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
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- Warren3200gt
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Re: using dwell meter for tuning carbs
29 Jul 2022 01:39 - 29 Jul 2022 07:42
No, a dwell meter has nothing to do with rpm. It measures the number of degrees of every rotation of the crank the points open and close. If the points are set to open and close 180 deg apart per rotation that doesn't change if the crankshaft is turning one rpm or ten thousand rpm.
To set pilot screws accurately you need a colour tune tool. It replaces the spark plug whilst tuning and allows you to view the colour of the combustion flame. Blue is lean, orange is rich.
To set the pilot correctly, fit the colour tune tool, start the engine, adjust the idle up to about 1800 rpm using the idle screw. Check the combustion flame colour and then adjust the pilot screw so that the combustion colour turns blue with the merest hint of orange. Then move on to the next carb.
Remember that pilot screws affect the first 1/3 of the throttle opening solely but are still operating throughout the entire rev range so affect higher throttle openings also but to a decreasing percent the more of throttle is opened.
To set pilot screws accurately you need a colour tune tool. It replaces the spark plug whilst tuning and allows you to view the colour of the combustion flame. Blue is lean, orange is rich.
To set the pilot correctly, fit the colour tune tool, start the engine, adjust the idle up to about 1800 rpm using the idle screw. Check the combustion flame colour and then adjust the pilot screw so that the combustion colour turns blue with the merest hint of orange. Then move on to the next carb.
Remember that pilot screws affect the first 1/3 of the throttle opening solely but are still operating throughout the entire rev range so affect higher throttle openings also but to a decreasing percent the more of throttle is opened.
Last edit: 29 Jul 2022 07:42 by Warren3200gt.
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Re: using dwell meter for tuning carbs
29 Jul 2022 05:48
I am going to take a guess that the dwell meter in question has a "tacho" function also ??
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kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
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Re: using dwell meter for tuning carbs
29 Jul 2022 07:35 - 29 Jul 2022 07:58
Possibly, but then it's not a dwell meter he's using but an electronic multi meter with a dwell function and a tacho function. similar to the pic I posted below which is not a dwell meter but a multimeter.
His thread title specifically said dwell meter.
If it has a tacho function and the bike has points/condensors chances are the meter doesn't have a built in damper and the needle will jump about all over the place as points ignition has very erratic pulse voltage to the coils. The very reason electronic ignition was developed originally.
Rather than doing it half hearted and guesstimating he'd be better off getting a colour tune and doing right. They aren't expensive.
Rigth tool for the job will always get the best results for half the effort.
His thread title specifically said dwell meter.
If it has a tacho function and the bike has points/condensors chances are the meter doesn't have a built in damper and the needle will jump about all over the place as points ignition has very erratic pulse voltage to the coils. The very reason electronic ignition was developed originally.
Rather than doing it half hearted and guesstimating he'd be better off getting a colour tune and doing right. They aren't expensive.
Rigth tool for the job will always get the best results for half the effort.
Last edit: 29 Jul 2022 07:58 by Warren3200gt.
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Re: using dwell meter for tuning carbs
31 Jul 2022 19:39
sorry for not clarifying what I was aiming to do with the dwell meter, as I do not have a points ignition. I was only trying to use the tach setting to note the slightest change in rpm while setting my pilot mixture screws. Thank you all!!
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