Any need to jet up when adding MSD Total Loss?

[Jameski]

Is there any need to go up on jetting sizes when adding MSD total loss to a R/N with b.pipe?????

Factory Pipe recommend 70 pilots 135 mains for the pipe.

Stock carbs
no porting.

 

[Matt_E]

Stays the same, or even jet down a bit (burns better)

 

[Jameski]

Cheers Matt,

So really i wouldnt have to change the jetting from what i have until i maybe got porting or went to bigger CCs ???

What other engine mods would require a step up in jetting???

Thanks again.

 

[Matt_E]

Anything that changes airflow through the engine.

Boring the engine bigger doesn't necessarily change that. Everytime I have bored up, jetting did not change at all.
Porting will change it, pipe, reeds (some).

 

[Jameski]

Sorry forgot to mention im running a set of Boysen Rad valves as well, should i take them into consideration?

 

[Matt_E]

If you are simply adding a TL system, there is no need to change jetting.

As I understand it,you are already running the RAD valves and your carbs are tuned correctly.

 

[Watty]

On a full limited setup, I went from a stock CDI to a total loss system and I didn't change a single thing. It was pretty much spot on the money. I would have thought I might have needed to jet up, but, it works, and I'm leaving it that way.

 

[Jameski]

I had been running with 75 and 137.5 with my old riva wet pipe and stock ignition and it was running great.

Then added new B.pipe and Total loss and kept same jetting. But think i might be a touch rich compaired to F/P specs.

So i gona try there specs 70 and 135 and see what thats like.

 

[spence]

what about if you have a stock ski and add a am waterbox?

 

[Matt_E]

No jetting change.

 

[eel]

Are you using an msd ignition to emulate a stockish curve?

 

[Jameski]

I had been running with 75 and 137.5 with my old riva wet pipe and stock ignition and it was running great.

Then added new B.pipe and Total loss and kept same jetting. But think i might be a touch rich compaired to F/P specs.

So i gona try there specs 70 and 135 and see what thats like.

Tried 70s and 135s , pilot jet was way to lean. Ski would hardly pull of the line at all, back to the 75s and 137.5s top and bottom screws 1 turn out, ski ran so much better.

So when adding a set of reeds(Boysen) you need to jet up a few sizes?

Does anyone run 70s with b/pipe and get good results (stock 38s)???

 

[Matt_E]

Some do. Never worked for me.