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Old 09-20-2009, 09:58 PM   #1
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Default Novarossi N21B limited Fuel question

I am getting ready to buy on of these but i have a quick question. On the spec sheet I was reading it said not to use more than 25% nitro content fuel. Well, as odd as this sounds a had 2 Cases (NEW, Not Old) of Byron Gen 2 30% nearly fall into my lap. I have sold a few gallons to the locals but I would like to be able to use it myself. However I dont want to damage the engine. Can someone tell me what to do?
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-Will
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Old 09-20-2009, 11:26 PM   #2
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It should be fine, BUT i am not a novarossi expert...When Monty comes he will know what he's talking about!
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Old 09-20-2009, 11:38 PM   #3
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I run 30% Sidewinders Worlds Blend in mine with no issue at all.
Monty just recommended I added a shim for 30%....mine came at .70 and he said add a .10 and I would be fine.
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Old 09-20-2009, 11:48 PM   #4
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Originally Posted by supralative View Post
I run 30% Sidewinders Worlds Blend in mine with no issue at all.
Monty just recommended I added a shim for 30%....mine came at .70 and he said add a .10 and I would be fine.

+1 Monty told me to do the same think as well
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Old 09-20-2009, 11:57 PM   #5
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^ What they said.

Add a .10 shim and run something similar to a McCoy #8 or Nova 6 and you should be fine.
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Old 09-21-2009, 03:53 AM   #6
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The odo 99 plug runs the best,I have a 2 bf limiteds and they love that plug and tunes great.
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Old 09-21-2009, 05:21 AM   #7
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I run 30% nitrotane in my and a MC59 and she runs all day long. I can ran two weekends on a plug I love that motor.
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Old 09-21-2009, 07:44 AM   #8
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I run byrons 30% gen 2 with the O'donell purple sport plug and have no problems, matter of fact I have never blown a plug. I check the plug before the main and pop in a new one if it doesn't look prefect but i'll only replace one every two or three race w'ends.
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Old 09-21-2009, 09:31 AM   #9
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Sidewinder 30% and MC-8 plugs. No mods to engine. No problems after 5 gallons and running...
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Old 09-21-2009, 10:00 AM   #10
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Add .10mm worth of shims and put either n OD77 or OD99 (depending on tuning ability) in it and it will run jut fine.
The motor will run with the stock shimming, but it will gain a little top end by adding .10mm.
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Old 09-21-2009, 10:58 AM   #11
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I have had 2-3 of those engines and they were fine on 30%, but if you don't want to take a chance just pick up some 20% fuel and mix it half and half and presto you have 25%.
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Old 09-21-2009, 11:42 AM   #12
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Quote:
Originally Posted by Lomax View Post
I am getting ready to buy on of these but i have a quick question. On the spec sheet I was reading it said not to use more than 25% nitro content fuel. Well, as odd as this sounds a had 2 Cases (NEW, Not Old) of Byron Gen 2 30% nearly fall into my lap. I have sold a few gallons to the locals but I would like to be able to use it myself. However I dont want to damage the engine. Can someone tell me what to do?
Thanks
-Will
recommend reshimming to .80mm but it will still be fine with .70mm


easier break , better mileage and more rpm by way of less compression


you can actually shim at .85mm and get a little smoother power and longer runtime shhhhhhh!! dont tell anybody
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Old 09-21-2009, 05:32 PM   #13
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.80 shimming equals one two silver and one copper or no mine has that in it now but that is what it came with it runs alright for practice but is missing top end
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Old 09-21-2009, 05:38 PM   #14
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Originally Posted by houston View Post
recommend reshimming to .80mm but it will still be fine with .70mm


easier break , better mileage and more rpm by way of less compression


you can actually shim at .85mm and get a little smoother power and longer runtime shhhhhhh!! dont tell anybody
whaaaaaat. hmm. mr monty, did you by any chance hook me up with this when you done did my engine?
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Old 09-21-2009, 05:45 PM   #15
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whaaaaaat. hmm. mr monty, did you by any chance hook me up with this when you done did my engine?
yours is at .80mm , how is it lately ?
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