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HelicopterGasser Model RC HelicoptersOther › engine running now
05-16-2008 07:29 PM  9 years agoPost 1
monkey nuts

rrApprentice

chester england

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ive bought a new engine this week from rossendale models uk.the throttle connection at the bottom of the carb touches the frame and i cant fit the servo ball for the linkage to the servo. i have an vario acrobat. what do other people do coz i think the engine is standard that vario use?

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05-16-2008 08:08 PM  9 years agoPost 2
Billme

rrElite Veteran

MS

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you want to take the stock arm off on the carb, and cut the brass shaft so as it just misses the bottom plate...Get the throttle arm Vario makes for this, and position it as the book states... Arm should be 90 deg to the centerline of the model with the carb butter fly at 50%.. the carb butterfly will be 50% when the throttle plate, the side that is straight, is 90 degs to the center line...
Using the 6 star futaba servo arm, place it one hole in when you find the arm that requires no subtrim... You should be able to set your atvs to 85, and 85 for a perfect throttle setup....
Bill

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05-16-2008 10:29 PM  9 years agoPost 3
zone8

rrApprentice

Ireland

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I didn't like the Vario solution for my Acrobatic (too much play and awkward) so I quickly bolted a washer on top of the carb then made a bent link, as depicted. I got 85/85 ATV and my governor works very well.

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05-17-2008 12:22 AM  9 years agoPost 4
monkey nuts

rrApprentice

chester england

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zone8
thought about that idea, it seems a lot better if you ask me,i thought about putting a longer arm on the servo so the push rod wont need to be bent so much.

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05-17-2008 01:59 AM  9 years agoPost 5
zone8

rrApprentice

Ireland

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You can't use a longer arm with this setup: even just one hole up would send my ATVs way too low (for the governor to engage). When the servo rotates, the pushrod is very smooth and easy on the carb, so having it so bent is apparently not an issue.

You can, if you want, raise the servo using a self made bracket with spacers, there is plenty of room to go up and have the pushrod straight. After flying with this setup I didn't see any reason to do this though.

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05-17-2008 02:14 PM  9 years agoPost 6
monkey nuts

rrApprentice

chester england

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have sorted the problem out with the throttle arm.
its running now.
the new engine 26cc,\ old engine 22cc,the 26cc engine seems to be revving higher before the clutch bites, is that typical for the engine. when running the engine for the 1st time do you get any kind of different engine sounds untill its been run in for a while? there seems to be a funny noise,aswell as the engine sound. is this normal? if i rev it a bit it goes then comes back. ive put extra oil in it, its only just been running for 2/3 minutes.

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05-17-2008 03:57 PM  9 years agoPost 7
zone8

rrApprentice

Ireland

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I upgraded from the stock 230RC to a ported 260RC but didn't notice any difference except when at full throttle. Maybe more noise from the intake, quite metallic, is maybe this the funny noise your hearing?
Another difference the needles, with the 260RC I had to open them badly, I am now running 1 1/2 low and 2 high.

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