SF2 Exhaust Flange Question

[CDHE]

My new exhaust pipes (from Wolfgang) are stepped up to 43.5mm OD at the head, and the exhaust flanges have an ID of 40.5mm. Thoughts on how to proceed?

 

[chrisk]

My new exhaust pipes (from Wolfgang) are stepped up to 43.5mm OD at the head, and the exhaust flanges have an ID of 40.5mm. Thoughts on how to proceed?

I think Redax have the correct ID billet flanges ….. but then, I was wrong once before

 

[1200ts]

I have had the same problem. You need to find someone with a lathe to bore them bigger.

 

[Cccg]

If you choose to get new one's, and Red doesn't have any. I have billet aluminium one's in stock to suit your requirements.
Italbrit Classic Motorcycles

 

[CDHE]

i can bore the flanges out, but still confused about how the pipe is affixed in the head.

 

[rez]

My new exhaust pipes (from Wolfgang) are stepped up to 43.5mm OD at the head, and the exhaust flanges have an ID of 40.5mm. Thoughts on how to proceed?

Do you use the Big-Valve-Head ( 36mm DellOrtos ).

 

[CDHE]

I don't know which head I have. Bike did not come with carbs. Previous owner had the head blueprinted by Engine Dynamics

 

[rez]

I don't know which head I have. Bike did not come with carbs. Previous owner had the head blueprinted by Engine Dynamics

You can measure it.
Inlet of the small-valve-head should
be near 30,3mm.
Big-valve-head has more

 

[Tippie]

"i can bore the flanges out, but still confused about how the pipe is affixed in the head."
That type of flange needs the collet system (59-63) as shown in this parts diagram from Andy Wagner.

Chapter 18

SILENCER, INSTRUMENT PANEL, TOOLS GT-SF3

www.laverda-paradies.de

The flanges you have are probably the ones of different dimension, that go on the model without the crossover.

 

[hooksey]

i can bore the flanges out, but still confused about how the pipe is affixed in the head.

You will need 2 x half rings for each header, and a flange with recess for said half rings.

 

[alan james]

Hi
I have exactly what you need original factory items. Bore 46mm, counterbore for the half rings 49mm. I do not have the half rings.
P.M me if wanted.
Alan.

 

[CDHE]

Okay. Making sense now. Thanks to all for setting me straight!

 

[Gerald]

Contact Wolfgang, he has the correct flanges and half rings.

Gerald

 

[Ernesto]

Slide the flanges over from the exhaust side of the pipe! Ciao, Gert

See pic. He has the crossover pipes.

 

[rez]

SF2 with small-valve Head?

 

[piranha-bro2]

SF2 with small-valve Head?

Small-valve-head headers with SF1/2/3 big-valve-head flanges I'd say. Just need to coordinate the bits.

 

[TeddyG]

When you get that exhaust fitted please let me know how you like it and if the cross over pipe makes a performance difference. My 750 SF came w/ a Malcolm Cox exhaust w/ no cross over, and I've heard it affects mid range. I haven't ridden the bike much yet to tell how it's performing

 

[motoddrob]

All of us 750 owners back in the 70s ditched that crossover as all it did was reduce cornering speed and made the bike too quite!!!
Made fuck all difference to mid range and added a shit load more weight. I'm talking SF1,2,3

 

[piranha-bro2]

All of us 750 owners back in the 70s ditched that crossover as all it did was reduce cornering speed and made the bike too quite!!!
Made fuck all difference to mid range and added removed a shit load more weight. I'm talking SF1,2,3

 

[CDHE]

When you get that exhaust fitted please let me know how you like it and if the cross over pipe makes a performance difference. My 750 SF came w/ a Malcolm Cox exhaust w/ no cross over, and I've heard it affects mid range. I haven't ridden the bike much yet to tell how it's performing

Bought my bike in pieces, so I won't be able judge any changes, but I do plan to run it on the local Ducati shop's dyno....Hopefully yet this riding season!