YS 61 ST-2 +Muscle Pipe?

YS 61 ST-2 +Muscle Pipe?

Post by Nigel Revil » Tue, 11 Apr 2000 04:00:00



I have just fitted an ST-2/Muscle pipe on my Vigor (only a gallon of cool
power 30 through it so far, Enya No3 plug).

 It appears to have a very rich spot on transition at about 3/4
throttle.(pulls well at the top end)

I really don't want to lean the midrange out any more as the Hover smoke is
satisfactory (at about 1650 rpm).

The pipe currently set at 11 3/4"  (the maximum limit on the instructions).

Any thoughts? (gets better when run more? , change to a muffler?)

TIA

Nigel

 
 
 

YS 61 ST-2 +Muscle Pipe?

Post by Steve Simpso » Wed, 12 Apr 2000 04:00:00


Change to a muffler.

That's not intended as a flippant answer. But there was recently a lot of
discussion of this very issue, so you should be able to look it up.


Quote:
> I have just fitted an ST-2/Muscle pipe on my Vigor (only a gallon of cool
> power 30 through it so far, Enya No3 plug).

>  It appears to have a very rich spot on transition at about 3/4
> throttle.(pulls well at the top end)

> I really don't want to lean the midrange out any more as the Hover smoke
is
> satisfactory (at about 1650 rpm).

> The pipe currently set at 11 3/4"  (the maximum limit on the
instructions).

> Any thoughts? (gets better when run more? , change to a muffler?)

> TIA

> Nigel


 
 
 

YS 61 ST-2 +Muscle Pipe?

Post by David Harke » Wed, 12 Apr 2000 04:00:00


Curtis is running the exact same setup except for the  plug and has the same
problem right now. He is trying to work it out, so you might e-mail Curtis
and ask him what you can do to correct it.

Quote:
> I have just fitted an ST-2/Muscle pipe on my Vigor (only a gallon of cool
> power 30 through it so far, Enya No3 plug).

>  It appears to have a very rich spot on transition at about 3/4
> throttle.(pulls well at the top end)

> I really don't want to lean the midrange out any more as the Hover smoke
is
> satisfactory (at about 1650 rpm).

> The pipe currently set at 11 3/4"  (the maximum limit on the
instructions).

> Any thoughts? (gets better when run more? , change to a muffler?)

> TIA

> Nigel

 
 
 

YS 61 ST-2 +Muscle Pipe?

Post by r.. » Thu, 13 Apr 2000 04:00:00


A friend of mine has an ST2 and a Muscle Pipe, and while it's extremely
powerful it does not hover smoothly.  I had high hopes for this setup
at first, but having spent a bit more time with it, I'm no longer so
enthused.  I think the ST2 may need a throttle barrel revision before
it works well with the pipe.

My original ST also had a rich spot at 3/4 throttle with the original
throttle barrel, even when used with a regular Hatori muffler.  Then
YS/Futaba released a new barrel, reportedly for use with a governor,
and the problem went away.  Maybe we can hope the ST-2's barrel will
get updated as well?

In our case, the "3/4 rich spot" wasn't the issue.  Tt was running very
rough in a hover, shaking a lot, and it acted like the mixture was
changing from rich to lean every few seconds.  Just weird.  Made tons
and tons of power though, so I'm really hoping that this combination
can be made to work eventually!

Quote:
> > I have just fitted an ST-2/Muscle pipe on my Vigor (only a gallon
of cool
> > power 30 through it so far, Enya No3 plug).

> >  It appears to have a very rich spot on transition at about 3/4
> > throttle.(pulls well at the top end)

> > I really don't want to lean the midrange out any more as the Hover
smoke
> is
> > satisfactory (at about 1650 rpm).

> > The pipe currently set at 11 3/4"  (the maximum limit on the
> instructions).

> > Any thoughts? (gets better when run more? , change to a muffler?)

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