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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › os 105 hz-r start issues
06-30-2014 01:12 PM  6 years ago
Josh Kussman

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Superior, NE

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You might try opening ur idle needle if u haven't already just to make sure

If it's ur regulator try and see if OS will replace it. If not open up the regulator and make sure the diaphragm is installed Correctly, if it is ur spring maybe holding it shut, u can try adjusting the spring
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07-01-2014 11:11 AM  6 years ago
f14tomcatfreak

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rochester,ny us

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ok I will look into that thanks shut up and fly
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01-13-2015 08:15 PM  5 years ago
mikeangiulo

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Bellevue, WA - USA

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Did you ever get this to work? I'm having the same problem with a 105HZ-R that ran 4 times and then mysteriously quit - won't try to catch at all on starting (new plugs, tight head, good fuel pressure, etc)
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01-19-2015 03:55 PM  5 years ago
Gary H

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Minnesota USA

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Maybe I am right, maybe I am wrong but, I have found out in starting these larger engines I really had to spin them over much faster then the 50`s. Where we fly all the guys use large starters that get the job done!! Especially when you start a cold engine. After that mine usually pop rt off.

Gary H
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01-19-2015 04:19 PM  5 years ago
wjvail

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Meridian, Mississippi

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My DRS engines can be hard to start first flight of the day. Especially so if they've been sitting for a week or two. Try removing the glow plug heater, moving the throttle to 50% (ish) and spinning the engine over briskly. Now go back to idle, reconnect the heat and see if it will start.

It seems that the regulator/check valve in my engines get a little "stuck" if they've sat a while and cranking at idle isn't enough to clean 'em out. Cranking the engine with the carb open seems to help pressurize the tank and draw enough fuel through the regulator to get things flowing.

This seems only necessary for the first start of the day and only with an engine that has sat for a period of time. Subsequent flights in the same day never require this.

A note of caution... Be careful to do the above in exactly that order. Don't blame me if you end up with a hot start!

Bill
"Well, nothing bad can happen now."
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01-19-2015 04:23 PM  5 years ago
Jim Cimino

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NE Pennsylvania

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I always open the throttle full and crank the engine for a few seconds to prime it. I then use a delayed glow igniter to allow the engine to start spinning as the glow plug voltage ramps up. We used the same concept on the race cars as we would start spinning the engine and then turn on the ignition. Radio South makes a nice glow driver with delay for the larger engines.Team Synergy, Team Scorpion, No good deed goes unpunished
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01-19-2015 04:25 PM  5 years ago
wjvail

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Meridian, Mississippi

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Was starting to think the same thing... Is there a way to test it?
Try this:

- Remove the plug.
- Open the high speed needle 3 turns.
- Open the carb 100%.
- Stand back - warn others.
- Spin motor briskly with starter.
- Look at open glow plug hole.

There should be a impressive white mist of fuel making a mess of everything. No mist - no fuel - no motor workie.
"Well, nothing bad can happen now."
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › os 105 hz-r start issues
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