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Old 05-26-2010, 09:16 PM   #1
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Default Is this normal? - Dynamite Mach 2 .21

I just broke in my Dynamite Mach 2 .21, and I have found that I can't even get it started unless I screw the low speed needle out 3 turns. This strikes me as odd, because the factory settings are 2.5 turns out. I thought factory settings were supposed to be rich? Do you think I have some kind of problem with my engine?
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Old 05-26-2010, 09:20 PM   #2
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Sounds like you have a really big idle gap to me. Get a pair of calipers or something and you want the opening on your car to be about .7mm-1.0mm. just make sure the open when the carb is shut is small. The smaller the hole the leaner you will run on the lsn.
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Old 05-26-2010, 09:22 PM   #3
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what was the weather like? cold? damp? could have been high bp..
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Old 06-06-2010, 09:09 PM   #4
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I checked the idle, it was only about 1mm certainly no more. I went racing today I even tried closing the idle screw even more but to no avail. It is worth noting I can get a pretty decent tune on it when I do richen it out. Do you think that their factory settings are just off?
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Old 06-06-2010, 11:27 PM   #5
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Originally Posted by OFFroadrunner View Post
I checked the idle, it was only about 1mm certainly no more. I went racing today I even tried closing the idle screw even more but to no avail. It is worth noting I can get a pretty decent tune on it when I do richen it out. Do you think that their factory settings are just off?
is that with or without the restrictor in? i made the same mistake when first starting, i did the idle gap with the restrictor in.
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Old 06-07-2010, 08:55 PM   #6
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Thats less then 1mm with restrictor out.
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Old 06-08-2010, 11:29 AM   #7
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Hi.

I've had an RB WS7II engine under my wings for a short period of time. I used my own homebrew, and before the first start, I set the needles as the manual suggested. The LSN was WAAAY too lean. Had to open it 1 turn, before I could prime and start the engine.

Otherwise it sounds like too lean HSN, issuse with the fuel line/tank, dirt in the carburator or an airleak.
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Old 06-09-2010, 12:01 AM   #8
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Needle settings are just starting point they are nothing to live or die by.
There are too many things that can change it like car/truck, exh pipe, length of fuel line supply and pressure line, gearing, body, fuel, weather and the biggest thing how you drive it.
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Old 06-09-2010, 02:46 AM   #9
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Is that motor air tight ?
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Old 07-11-2010, 10:05 AM   #10
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I am using an O.S #8 plug, as was recommended by someone on these forums, but it is a little bit shorter than the stock one. Could that be causing problems and if so which plug would be a better choice?
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Old 07-11-2010, 10:12 AM   #11
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Every engine will have different settings. When in doubt set it back to factory settings and retune. The biggest mistake I always make is wanting to touch the lsn before I get the hsn dialed in. That always results in a lean lsn and righ hsn. It has bitten me more than once. Just remember that the fuel flows through the hsn before it gets to the lsn so if the Jan is too rich then it will let too much gas into the lsn you might want to lean the lsn but don't leaning the hsn will lean the lsn too. Bottom line is set the hsn needle and then set the lsn.
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Old 07-11-2010, 10:54 AM   #12
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Quote:
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The biggest mistake I always make is wanting to touch the lsn before I get the hsn dialed in. That always results in a lean lsn and righ hsn. It has bitten me more than once.
I've found myself doing this alot lately. I pretty much try to tune my motor through the lsn, never really touching the hsn. And it results in a lean lsn like you said.
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Old 07-11-2010, 02:15 PM   #13
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So the #8 plug is alright, even though it is shorter?
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Old 07-11-2010, 02:19 PM   #14
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So the #8 plug is alright, even though it is shorter?
yeah
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Old 07-11-2010, 04:17 PM   #15
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+1 Yea, the plug is fine. Dont worry to much about the needle settings. I have had engines before that they would not even start also with the " fatory" settings. AS long as it is running good and temps are ok. Its fine
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