Checking timing SJ, w/MSD ign, stock flywheel vs.TBM

[Proformance1]

Well Ed Brazina suggested checking the timing on my stock flywheel with the MSD enhancer. I wish I had done the stock ignition also, but I want to get this done and back together soon, so I'm keeping the test work to a minimum. I am changing to a TBM flywheel as soon as I'm done checking the timing with the stocker. #Zero gave me the idea for these stickers, and after about 15 min on autocad, here they are. Redrocket was nice enough to print them up for me. The stickers make it nice for checking the timing so you don't have to check TDC on both cyls, cause they are marked at 0 deg twice, 180 deg apart

1) Made up an aluminum bracket with a notch for the deg indicator line. I just drilled some holes in the plate where the coupler cover bolts go.

2) Take motor to TDC with a dial indicator.

3) Scribe a line where TDC is on the coupler.

4) Attach sticker to scribed mark

5) Fire up the timing light!



Sat morning hopefully I get all the numbers

 

[SUPERTUNE]

One of the great benefits to the quality of the TBM flywheels they time up perfect if your stock stator is correct.
It's nice to use TBM charging flywheels that work! Out of dozens of them only had 1 bad one...the ring gear split!

 

[Proformance1]

Just test ran it dry on the trailer for a second tonight. I have 23 deg of timing at idle, approx 1500-1800 rpm. More details to follow on Sat with the tach

Does anyone have the curve for an MSD enhancer, I couldn't find it anyplace?

 

[#ZERO]

Good idea... I made some timing tapes using Corel Draw and just never got around to having them printed up in bulk.

Here's the timing curve chart for the MSD enhancer.

 

[SUPERTUNE]

That's pretty close... right where it's supposed to be.
Well maybe 24 would be perfect for most setups with some really decent compression ratio.

 

[Proformance1]

As usual this place is great for good info from great people!
Today, in between the snow flakes and dinner with Mom, I did manage to get the TBM flywheel in and tested. Thanks # Zero for the graph it's pretty darn close.

I would say the stock flywheel was around 23 to 24* BTDC with the stock flywheel at 2000 RPM, with the TBM I'd say it was close on both cylinders, maybe 1* less 22 to 23* BTDC at 2000 RPM. They both dropped off about the same at 5000 RPM maybe 1* or so.

I did notice a little stumbling once in a while that would jump it up to almost 25*, then immediately drop back to around 21*. Maybe because the engine wasn't warm. Someone with more knowledge than me may be able to comment on that. It happened as I was going up from 2000-5000 rpm's.

I threw in some picts of the stocker for ref, it's different than the others I have seen. Didn't they used to have 4 magnets showing on the inside?

Gotta give props to Chuckie and my new flywheel lock from Cold Fusion. I've used it on two motors with great results, easy to use and very good for holding the flywheel solid.

All in all it was a great test and I learned lots. Thanks to all who helped. Knowledge makes power!

 

[GIL]

As usual this place is great for good info from great people!
Today, in between the snow flakes and dinner with Mom, I did manage to get the TBM flywheel in and tested. Thanks # Zero for the graph it's pretty darn close.

I would say the stock flywheel was around 23 to 24* BTDC with the stock flywheel at 2000 RPM, with the TBM I'd say it was close on both cylinders, maybe 1* less 22 to 23* BTDC at 2000 RPM. They both dropped off about the same at 5000 RPM maybe 1* or so.

I did notice a little stumbling once in a while that would jump it up to almost 25*, then immediately drop back to around 21*. Maybe because the engine wasn't warm. Someone with more knowledge than me may be able to comment on that. It happened as I was going up from 2000-5000 rpm's.

I threw in some picts of the stocker for ref, it's different than the others I have seen. Didn't they used to have 4 magnets showing on the inside?

Gotta give props to Chuckie and my new flywheel lock from Cold Fusion. I've used it on two motors with great results, easy to use and very good for holding the flywheel solid.

All in all it was a great test and I learned lots. Thanks to all who helped. Knowledge makes power!

WTF? Did u say SNOW FLAKES???????? On May 9th???????????? Dayummmmm I love the South!!!

 

[Proformance1]

Here is the flywheels I'm used to seeing. My newer flywheel really resembles the TBM, or Vs. versa. LOL

Any feedback on the jumpy timing after installing the lightweight flywheel?

 

[masterblaster]

thats an old 61x fw the 62T and the stator are larger internal size.the stumbly feeling you got was the timing coming off when the motor gets in the low rpm,not as much rotational weight so you feel and hear it more with the lite fw

 

[Proformance1]

Well Phil, Steve and myself are all a little disappointed in the flat water difference witht the TBM. None of us really noticed a difference in the power delivery of the ski. I only rode it for about and hr, and we normally dont ride flat, so it's probably not a good test. I did notice it stopped alot faster, and possibly reved up faster, but thats about it. More details when we get surf and warmer temps. Everyone always says such great things about light weight flywheels, maybe i'm missing something.

 

[MADMAT]

Thanks for this thread!

 

[Frosty]

I have the sticker and bracket at my house - I will test my lightened OEM flywheel (MSD enhancer) setup to see how it comes out... as soon as I return from Cali in two weeks. I'm curious how it does against both stock and the MSD flywheel.

MADMAT, I think Brian was going to make up more brackets, and I think Nick has stickers done up... if you are interested you can shoot him a PM... he can prbly hook you up.

 

[MADMAT]

Thanks man...will do!

 

[Proformance1]

Yeah Nick made some extras up, let me know if you need one