OS 7D carb
06-13-2010, 12:50 AM
#51
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RE: OS 7D carb
I suspect you have a 7DV I have one on my OS 61 FSR they do not need the insert, as stated in pasts posts.
The 7D with insert came out on a 61 RF normaly but I think some times they were ordered special for FSR 61 engines.
Oil in Muffler could be from running too rich a mix, all depends on the type of fuel and what type of oil, with castor (castrol M) 20%, 5% nitro you should get a grey/black deposit on your tail when the mix is about right after a 16oz tank of fuel. there should not be oil inside your muffler of any large amount.
I run my engine's 2 clicks or so rich from max RPM to allow for leaning out in the air.
Hope this helps
Johnkpap
The 7D with insert came out on a 61 RF normaly but I think some times they were ordered special for FSR 61 engines.
Oil in Muffler could be from running too rich a mix, all depends on the type of fuel and what type of oil, with castor (castrol M) 20%, 5% nitro you should get a grey/black deposit on your tail when the mix is about right after a 16oz tank of fuel. there should not be oil inside your muffler of any large amount.
I run my engine's 2 clicks or so rich from max RPM to allow for leaning out in the air.
Hope this helps
Johnkpap
06-13-2010, 02:12 AM
#52
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RE: OS 7D carb
I agree that that looks to be a 7DV carb rotor.If that's the 8mm bullet and a 9mm doesn't fit you got your answer and don't need the insert.
You never mentioned what size prop you are using with this engine. What size is it?
You never mentioned what size prop you are using with this engine. What size is it?
06-13-2010, 11:07 AM
#53
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RE: OS 7D carb
11x6
I richen ΒΌ turn back after max rpm. Is two clicks rich ok?
ΒΌ rich is how I run all my 4 strokes.
I am getting a black oily deposit from muffler to tail witch literally is dripping off of the wing saddle, fuselage, and tail.
I richen ΒΌ turn back after max rpm. Is two clicks rich ok?
ΒΌ rich is how I run all my 4 strokes.
I am getting a black oily deposit from muffler to tail witch literally is dripping off of the wing saddle, fuselage, and tail.
06-13-2010, 05:33 PM
#56
RE: OS 7D carb
HI I RUN An os 7D carb on AN OS 61 FSR 91 FSR AND 1.08 FSRAN ASP 7590 AND 1.08- ( ARE ASP OLDER OS FSR CLONE ENGINES -with 4 bolt crankcase ) S/T 3000 AND 3250I WAS TOLD the S/T 90 CAN USE THIS CARBBUT WOULD love someone to confirm that-flying for 20 yearsIMO THE 7D CARB IS ONE OF THE BEST CARBS EVER BUILT BY ANYONE FOR GLO APPLICATION SO DO USE IT ANY PLACE YOU CANMAKES ANY ENGINE YOU PUT IT ON RUN SMOOTHER AND LONGERTHEY DO NOT WEAR OUT I might ad most manf make a good enginebut they fall far short when it comes to the carbs they makeOS HAS the carb thing as right as it gets my comments refer to two cycle glo engines only ENJOY REGARDS TONY
