Search results

Thanks, I was seeing 70 at 7 as well, even on grass, standard reduction ratio on my first '03 RX1 purchased 2011 with 2400 miles showing, and my second one purchased 2013. Never had any place to run them any faster than that, kept running out of room.

Everyone wants to talk about WOT top end speed, but I couldn't care less. What I want to know is what does your sled do (MPH) at 7000 RPM, 7500 RPM, 8000 RPM and 8500 RPM on long, flat, smooth surfaces like lake runs? Thanks! Gerg

Everyone wants to talk about WOT top end speed, but I couldn't care less. What I want to know is what does your sled do at 7000 RPM, 7500 RPM, 8000 RPM and 8500 RPM on long, flat, smooth surfaces like lake runs? Thanks! Gerg

I've been flying an RX1 on my gyrocopter since 2011, been the unchallenged climb champ for two-place rotorcraft ever since. Now Rotax is marketing a turbo aircraft engine that will finally be a serious challenger, it's now time for me to boost this beast to stay on top. Typical sled turbo...

I need some APEX spark plug coils, so I checked on Ebay. Those sellers are all listing their coils as compatible for Apex and Phazer, but the shop manuals indicate they very different coils (although the mechanical fit is the same ), Apex coil spec is 5k - 6.8k ohms, while Phazer coils are 10k...

For firing order, look in the manual under valve clearance maintenance, the valve sequence and thus firing order is 1-2-4-3. In the original RX1 Manual that is page 2-10, and it is the same page on the following Apex manuals as well. This is why a bump in HP is realized when changing the...

There is a lot of variation on compression testing which largely depends on your test set. I never seen more than 150 PSI on any engine with my test set, no matter what type or make. As for Yamaha I've been flying them since I built the first YG4 in 2012. I've compression tested YG4 RX1 &...

I've done compression checks on numerous RX1's with anywhere between 400 - 10,000 miles on them. The extension hose to reach down into the spark plug hole seats with a rubber O Ring and I never tighten it beyond finger tight. On a cold engine, all plugs out and using the starter motor to crank...

Here are my methods for a leak down test> 1. Never do a leak down test with piston at TDC, always do it at 15-20° BTC. 2. Don't get your panties in a bunch over getting the angle perfect. Stick a long, skinny rod (a clean wood dowel or bamboo Shish kabob sticks from the grocery store work...

Ah, I've seen setups like this on other aircraft conversions, I always thought it would lead to mid-range power loss due to improper Helmholtz wave disruption at the intake valve seats. I figured though it may prove WOT improvements on a dyno for a flat-out ice drag race, in practical...

What is ECP?

Thank you! Holtzman was what I was looking for, lost track of the name/web site address.

Any RX1 Carburetor Vacuum Chamber Spring Modification Sets Around?

edited, see below

After-market all-metal water pump impeller replacements are NOT the end-all answer to YG3 (Yamaha Genesis 3 cyl) water pump failures. I personally know of at least 8 failures, INCLUDING billet cut impellers that were installed on engines that never had any history of overheating of pump failure...

Whatever happened to Freddie and his ECP shop? Both websites are gone.

Yes, please - What is the target air-fuel mixture reading on a gauge? I plan to buy one from Summit and play around with my RX1

Just these two things? OK. Thanks you guys.

What are the causes for an Apex (2011) to go into limp mode - with the TORS bypassed?

I am having a similar problem - unable to clear old codes on 2011 Apex engine while trying to run down a serious issue. Also, if anyone can please update the error codes lists available on TY4 for Apex that would really be helpful. I have something I am using culled together from several...