Re-jet for '80 100hp w/ performance upgrades

[iwombat]

So, I've finally got all the performance upgrade pieces assembled and the short-block ready to get machined on my '80 100hp. Now, I'm just curious about jetting. Here's what is getting added.

High-compression heads
Large throat (1-5/16") carbs
Boyesen Reeds
Bubble-back exhaust (if I can find one)

I'm kind of concerned about blowing out the Boyesen reeds with the wrong jetting given all the modifications. So, I'm thinking one plan may be to dial in the jetting w/ the stock reeds, then put in the Boyesens and enrichen by a couple of sizes. If someone here has a good starting point to work from I'll skip that step.

Ideas?

 

[Dhadley]

Re: Re-jet for '80 100hp w/ performance upgrades

The only jet that affects the Boyesens is the idle jet. Just go 2 or 3 sizes richer and don't worry about it. If you're too lean in the mid or top rpm it won't affect the reeds at all. But pistons are a different story.........

 

[iwombat]

Re: Re-jet for '80 100hp w/ performance upgrades

Good advice on the idle jets. I plan on starting with the 115 jets and having a good time with the jet drills until it gets rich enough.

Although, maybe starting with the 135 jets and swapping down is a better plan given lean risks in a two-stroke.

 

[Dhadley]

Re: Re-jet for '80 100hp w/ performance upgrades

No drilling. That changes the ramp angles and can make it flow less rather than more. And it changes the rifeling too.

 

[iwombat]

Re: Re-jet for '80 100hp w/ performance upgrades

Well then, no drills.

135 jets to start and swap down it is.

 

[Dhadley]

Re: Re-jet for '80 100hp w/ performance upgrades

What did you do to the intake? Which one are you using?

 

[iwombat]

Re: Re-jet for '80 100hp w/ performance upgrades

I haven't done anything to the intake yet.

You have some suggestions?

 

[Dhadley]

Re: Re-jet for '80 100hp w/ performance upgrades

dhadley50@aol.com -- intake secrets..............

 

[iwombat]

Re: Re-jet for '80 100hp w/ performance upgrades

Inquiring minds are . . .


inquiring.

 

[Dhadley]

Re: Re-jet for '80 100hp w/ performance upgrades

Sent back.......