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Need to verify this, but I think my
flywheels have more of a cup shape to them. In other words more
distance from front of counterweight to teeth.
I've have to get back to you.
Finn
I just checked and the distance from the rear of
the 1/2” plate to the ring gear is 2 1/8”.
Mine is a 13 B Renesis, but as I acquired the
engine from another builder who gave up on the rotary idea, I
cannot vouch for the correct counterweight.
But I can verify it is installed, you can see it in
the picture  Measured about 1 3/8" from rear of 1/2"
plate to front of starter ring gear teeth. That's on my RV-3B
with 2.85:1 PSRU.
On starter that I think I used with my 2.17:1 PSRU I
measured about 1 3/4" from starter mount surface to front of
(retracted) pinion gear. Eyeballing 3/16" to 1/4" between
retracted pinion and ring teeth.
Wrong counterweight?
Or, I think that maybe a different ring gear (plate) is
used for the 2.17:1 than for the 2.85:1.
Someone here correct me, or I can dig into the manuals for
each.
What are your measurements?
Finn
On 11/11/2025 10:55 AM, David Walker drw.aa@hotmail.com
wrote:
Hi all,
Hoping someone can unravel this
mystery about why my starter does not fit the RD1 assembly.
I have the Referenced the same
instruction manual and re-ordered the correct starter which
is for a 1988 non-turbo manual transmission.
Upon doing a dry fit of
everything, the result is that the starter is too short to
reach the ring gear, as pictured.
The counterweight is attached,
followed by a ring gear from an automatic transmission,
followed by 1/2” aluminum plate to which is mounted the
machine part that mates to the redrive.
The starter pinion gear is about
3/4” short of reaching the ring gear,
Totally stumped…
Thank you,
David Walker
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