early model upgrades

General Messages Post you pics as well

Postby yankeflyer » Sat Oct 22, 2005 9:42 pm

Anyone with experiance with these engines?


http://www.radne.se/Store/Product/Produ ... tNo=3201-4

Great forum - many topics to follow -

Honda engine looks good but I have not been able to find the model #
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Postby Guest » Sun Oct 23, 2005 5:30 am

I saw these engines last year when i was in Italy they produce a far amount of thrust with the re/drive and would be good replacement for the 185 even tho they are only around 120cc. bit pricey with the needed bits and exchange rate. the only thing i would question is if the bearing and set up of the lge pully that the prob bolts to can with stand a tractor application i have only seen them used as pusher mode. may have to change the shaft and bearing otherwise the prop and pully might fly off or lock form the thrust load. ozzie
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Postby xgary » Sun Oct 23, 2005 12:39 pm

The problem with those engines is the high rpm you need to get the power

power 10 kw 9000rpm
max rpm 13000 rpm



That is about 13.5 HP at 9k
don't expent that engine to last long cruising a 8000 to 9000 rpm

sound like fun till they puke.

i would bet you could get 15 HP plus fro mthe 185 with some tuned pipes and carbs re jetting and again higher rpms.

PROS vs CONS

Long Life ? OR lotsa power ?
Shorty .............
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Postby yankeflyer » Sun Oct 23, 2005 2:37 pm

I wasn't sure about the money I think it worked out to approximately 1050 US funds. I confess I'm not up on the new Euro symbol but I think that's what they were basing the exchange rate on. Point well taken about the pulley to shaft connection. Hopefully though it is threaded and secured by a large gland nut that can accommodate a safety wire, or otherwise be assured of its reliable operation in a tractor configuration.

The weight looked to be just under 15 pounds and there was the electric start and battery to consider and like Shorty pointed out, the RPM does sound high. I'll have to write them and asked if they'll send me a schematic, for possible application to a Lazair engine mount.

Still with the new lubricants that we use these days and high rpm engines that run 10,000 rpm or more have been common for years in the big bikes.

In the final analysis it will come down to how much money I have at the time when the good deal comes.
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Postby xgary » Mon Oct 24, 2005 6:09 am

all very neat ideas
new lubricants etc
but synthetics do not store your engine well and inviste moisture .

If you live in dry climate you are better off.

Don't ask me but ask a rotax mechanic.
every rotax guy i know says they like synthetics cause they bring them business. for overhauls. NOT KIDDING.

Up to you though -- many will argue that they are good.

i know what works for me for 30 years and no troubles with mineral oils IF you are using the proper ones and mixtures.
Shorty .............
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Postby yankeflyer » Mon Oct 24, 2005 8:10 pm

Mostly right now I'm putting together a list of powerplant options and maybe try to think out-of-the-box little bit - I have a good description of the rotax 185 --
USDA Forest Service Qualified Specification 5100-274C
Engine specifications
Rotax® Model 185cc
Maximum power 10HP(7,46 kW)
Engine 2-cycle, air-cooled, single cylinder with
replaceable cast iron sleeve
Starting system Recoil, with back-up manual rope starter
Ignition system Ducati electronic ignition
Stroke 2.40” (61mm)
Bore 2.44” (62 mm)
Displacement 185cc (11.29 cubic inches)
Lubrication Oil in fuel mixture (24:1)
Rotax 185 with muffler, prop and nacelle..... approx... 34lbs


I still need the weight for the 185 to have a complete description for a side-by-side comparison with the Swedish engine and reduction drive.
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Postby Shannon » Mon Oct 24, 2005 9:22 pm

Rotax 185 with muffler, prop and nacelle..... approx... 34lbs

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Postby yankeflyer » Mon Oct 24, 2005 11:06 pm

10kw 7.46kw

14.96lbs 34lbs

nacelle 2lbs

looks like less weight more power - great upgrade

Is there any experiance with titantium and aluminium used together.
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