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Setting timing on a RD350B

Started by 2t Fan, June 01, 2019, 04:29:39 AM

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2t Fan

Hello

Delighted to see the forum back  :metal:

I like to understand , after setting TDC where I should look on the Dial gauge for 2mm BTDC  ? Using Nick's ignition

thanks


quocle603

Quote from: 2t Fan on June 01, 2019, 04:29:39 AM
Hello

Delighted to see the forum back  :metal:

I like to understand , after setting TDC where I should look on the Dial gauge for 2mm BTDC  ? Using Nick's ignition

thanks

1.Find TDC, then turn the nut in the middle (12mm combination wrench or flat head) clockwise. You should go two full revolutions to get 2mm on your dial indicator.

2.Connect your test light or voltmeter that is set to diode, one to ground and the other to the pickup connection, now turn the nut until it starts to beep.

3.You now need to adjust the timing plate to make sure it the pickups spark at 2mm. You'll know when the indicator stops beeping. Test it by turning the nut counterclockwise and it should stop at 2mm.
                   *If not just make minor adjustments until it does. Once you set one side, the other should match it.*

4.Check your timing with a timing light.
Do not underestimate the power of a two-stroke.

1975 Yamaha RD350 (modified), 1973 Yamaha RD350 (stock), 1971 Suzuki T500, 1981 Yamaha XS650 HS2, 1982 Honda MB5, 1980 Puch Maxi, 1979 Puch Magnum, 1993 Tomos Bullet, 2003 Malaguti Firefox F15 LC

m in sc

make marks at 1.8mm btdc on the rotor, then time with a light. the timing will and can change with a magnetic triggered system.  :twocents:


2t Fan

Quote from: m in sc on June 01, 2019, 09:00:54 AM
make marks at 1.8mm btdc on the rotor, then time with a light. the timing will and can change with a magnetic triggered system.  :twocents:

why timing will change with a magnetic triggered system, what i should do then to fix it?


m in sc

from static to dynamic? it can drift off. always dynamically time with a light. the ONLY accurate way a dial gauge is used to finalize a timing setting is with points or an optic beam (like a newtronics or piranha)  in my experience. However, a timing gauge is needed to set or verify the timing mark. 


btw, thats me in the vid posted. I need to do an updated one for an mzb, dyna, and hpi.   :cheerleader:

quocle603

Quote from: m in sc on June 02, 2019, 12:00:40 AM
from static to dynamic? it can drift off. always dynamically time with a light. the ONLY accurate way a dial gauge is used to finalize a timing setting is with points or an optic beam (like a newtronics or piranha)  in my experience. However, a timing gauge is needed to set or verify the timing mark. 


btw, thats me in the vid posted. I need to do an updated one for an mzb, dyna, and hpi.   :cheerleader:

Gotta love that video!
Do not underestimate the power of a two-stroke.

1975 Yamaha RD350 (modified), 1973 Yamaha RD350 (stock), 1971 Suzuki T500, 1981 Yamaha XS650 HS2, 1982 Honda MB5, 1980 Puch Maxi, 1979 Puch Magnum, 1993 Tomos Bullet, 2003 Malaguti Firefox F15 LC

Czakky

I've only used that video a few dozen times.

Striker1423

Mark, I look forward to one on the Dyna setup. I tuned mine and was taking with Chuck about it how sensitive they were to the slightest nudging to set timing exact. I got it but dont have a timing light so 1.8btdc plus or minus .01 was as close as I could get.

RDryan

Quote from: quocle603 on June 02, 2019, 12:22:46 AM
Quote from: m in sc on June 02, 2019, 12:00:40 AM
from static to dynamic? it can drift off. always dynamically time with a light. the ONLY accurate way a dial gauge is used to finalize a timing setting is with points or an optic beam (like a newtronics or piranha)  in my experience. However, a timing gauge is needed to set or verify the timing mark. 


btw, thats me in the vid posted. I need to do an updated one for an mzb, dyna, and hpi.   :cheerleader:

Gotta love that video!


Long before I joined this forum I found that video and along with another video on how to make and use a buzzbox I got a handle on how to set timing. Great Videos.  Despite that I still went with the Vape/MBZ ignition.

2t Fan

ok, so it seems i should see the spark at 78.7402 thousandth of a inch on the dial gauge  :umm:

Jspooner

Quote from: 2t Fan on June 03, 2019, 09:11:01 AM
ok, so it seems i should see the spark at 78.7402 thousandth of a inch on the dial gauge  :umm:

Yes, If you are setting it at 2.0 BTDC
"Just quit brain fucking it and get it done"

2t Fan


2t Fan

Quote from: Jspooner on June 03, 2019, 09:37:43 AM
Quote from: 2t Fan on June 03, 2019, 09:11:01 AM
ok, so it seems i should see the spark at 78.7402 thousandth of a inch on the dial gauge  :umm:

Yes, If you are setting it at 2.0 BTDC

2.00 mm BTDC is ideal for a stock motor?

quocle603

Many people run 1.8mm BTDC for today's fuel quality.
Do not underestimate the power of a two-stroke.

1975 Yamaha RD350 (modified), 1973 Yamaha RD350 (stock), 1971 Suzuki T500, 1981 Yamaha XS650 HS2, 1982 Honda MB5, 1980 Puch Maxi, 1979 Puch Magnum, 1993 Tomos Bullet, 2003 Malaguti Firefox F15 LC