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Engine basics => Engine set up tips => Topic started by: Paul Wood on August 19, 2017, 03:09:07 PM
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I have an R/C version of the OS Max 45 FSR with the R/C carb wired open. It has served me well for many years, but the carb is worn out. I'd like to replace it with the proper NVA, but I can't determine which one will fit. Did a lot of research, but haven't found the answer. Can you guys steer me in the right direction?
Thank you,
Paul
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AHA , He's Not Aftyer a OS Needle , nercosarilly . :P
Some ST ones Center , But are a tight shove .
The real OS ones are pretty rare .
The OS Max 40 S & FSR 40 , along with Max C 35 intakes match .
mEASURE aCROSS THE INTAKE , TAKE HALF , AND SPECIFY >:( for ' flange to hole ' , on a aero products or similar .
ps might be the Merco NVAs that are a mighty tight squeeze .
Custom , Mr Hunt & colleges went for from .275 to .318 Venturies , for the FSR 40s . typically .285 to .310.
with .318 for his Xe 12x5W 11 in three blade at the 78? World Chumps .
If you trip over a pile of the Factory intakes , the FSR are taller than the 60s/70s Max S , Lemme know .
They can be whittled / honed out from there .280 / 265 . Came in Two Bores , in the long & short ones .
A lotta dudes use a ' sealing ' washer Ea Side on a spray Bar - so that gives you some leeway .
Incidently , What muffler do you run . And What aeroplane . Not many FSR s running in P A these days .
Ive Gotta Genuwine 40FSR-S & a bitsa Magnum / OS 45 . Spare Sleeve/Piston assys'd be handy .
The Royal 45 Clone has earliest closing on the Shaft , so likely best option .
Where Were We . . . NEEDLE VALVES ! :-X
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shtterman on Ebay will have what you need.Randy Smith our moderator here will have them also.
Mike
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https://www.ebay.com/sch/shtterman/m.html?item=222231125422&hash=item33be01ddae%3Ag%3A8AsAAOSw6btXRIwv&rt=nc&_trksid=p2047675.l2562
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I have an R/C version of the OS Max 45 FSR with the R/C carb wired open. It has served me well for many years, but the carb is worn out. I'd like to replace it with the proper NVA, but I can't determine which one will fit. Did a lot of research, but haven't found the answer. Can you guys steer me in the right direction?
Thank you,
Paul
Hi Paul
The OLD OS NVA from the late 1970s will work
The ENYA 60 NVA will work
The ST 60 NVA will work
The PA NVA will work
most any needle that has a .157 diameter spraybar will work OK, if they are wide enough
The OS 46 LA and FP will NOT work , The ones on EBAY for the FP LA35,40,46 are the OS 20 FP size and are TOO smal
Randy
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Hi Paul
The OLD OS NVA from the late 1970s will work
The ENYA 60 NVA will work
The ST 60 NVA will work
The PA NVA will work
most any needle that has a .157 diameter spraybar will work OK, if they are wide enough
The OS 46 LA and FP will NOT work , The ones on EBAY for the FP LA35,40,46 are the OS 20 FP size and are TOO smal
Randy
Thank you Randy. That is exactly what I was looking for. I'll be contacting you soon to see if you have one in stock.
Paul
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Got the old yardstick out , and measured the case . 0.698 " odd . or 0.7 to you and me .
That means .350 flange to ole .
The Randy Ones have the Nut on the ' other end ' , so you can remove without altering setting . And I think theyre a Fine Thread .
General rigmorol on Venturie was 1 " tall & 5 Deg. Taper , if your having a few knocked up .