raptormasque

Dear Kevin,

I am surprised that you ran your engine during 1.5 minutes with the throttle to about 3/4 without adjusting both valves for a very rich setting as recommended by Saito.
Please watch the following video made by Saito Japan.
https://www.youtube.com/watch?v=esGaEm9GUhk

Regards,

Alain

ForcesR

kevarc; this is my theory on your recent issue. I would bet that the E-ring popped off one of the Conrod linkpins which eventually allowed the linkpin to exit from the master rod. The engine will turn and feel smooth until the linked conrod starts to re-engage with the master rod, then it feels rough. What you hear rolling around inside the crankcase is more than likely the linkpin

kevarc

My Feedback: (2)

That video would have been nice. The manual said to open the throttle to over half, so I went to 3/4
I had the wench in hand to make the adjustments.
Next time I will be ready!
Kevin

MikeJM

I haven't installed it yet, but my cowl measures about 10.5" so I must have the larger cowl with my kit.

orthobird

My Feedback: (1)

this is great information. I had never done this with my FG 36, and it had run great too. But i can see how important this is. The comments made by you and JWS ACES are very good ones. thank you gentlemen.

raptormasque

Hi Mike,

This is a tight fit with the Saito but this is OK.

Alain

AKA2

Thanks Mike, talked to your namesake, owner of Gator rc, and says previous kits came with the 9.5" cowls. Newer ones, with 10.5 so bought one with confidence and waiting for it to install this beauty, Saito fg90r3!

CRG

My Feedback: (3)

wrong thread...

ForcesR

Here is the photos of the internal workings of the FG90R3; as you can see there is no lubrication, the crankcase is bone dry including the master rod and linked conrod connections. The master rod has a bushing that looks to be brass. I recommend before anyone who has this engine to inject lube oil into the crankcase before starting the engine for the break-in procedure.

jws_aces

My Feedback: (33)

Thanks for sharing..Yes it does look like a brass pin. I couldn't remember what was on the stock 84cc. Ray would open the hole and install a thin brass sleeve over the crank pin. Yes I broke mine in like the instruction said. Really rick so max RPM was only about 3k for at least one tank. Good video information.

ClausBN

Could we see pictures of the internal of the fuel distribution inside the bell ?

ForcesR

I'll have a look when I get home to see how many gaskets/seals have to be removed to get access to the intake manifold. I just don't want to damage any gaskets during disassembly to get access to the manifold and end up having to order a complete engine gasket set.

HH has sold all FG90R3's they brought in from the first batch, they are now on back order.

CRG

My Feedback: (3)

Actually they are showing as in stock.

ForcesR

IAW with the link, the main page identifies the FG90R3 is on back order, delivery late Feb.

http://www.horizonhobby.com/category...gines-15042--1

CRG

My Feedback: (3)

You have to go to the product page.

ForcesR

As requested, FG90R3 fuel intake manifold distribution channels.

ClausBN

Thank you. Interesting, its done like on the FG60 and the RE mods. However I dont see any "emulsion tube" (dont know if thats the right term?)
Is the fuel/air mix going straight into what chamber in the center? How is the back plate for the carb made?

ForcesR

Claus BN; the three chambers surrounding the center chamber are lightening holes to reduce the weight of the intake manifold/rear cover. The center chamber is where the fuel/air is delivered for dispersion to the three intake pipes. The carburetor is bolted to a fuel delivery emulsion tube that slides into the center chamber. The emulsion tube is approximately 4mm less in diameter than the inside diameter of the center chamber. The emulsion tube extends into the center chamber approximately 3/4's of the chamber's depth. The fuel/air travels down the length of the emulsion tube until it comes in contact with the rear face of the chamber, than is redirected back between the outside wall of the emulsion tube and inner wall of the center chamber. Then the fuel/air mixture is picked up by the three intakes pipes and delivered to the cylinders.

n8622t

My Feedback: (8)

Thanks ForcesR....that's a Ray English mod and it's a bronze bushing

ForcesR

n8622t, can you tell from looking at the photos above of the fuel intake manifold, is it identical to the Ray English mod for the FG-84R3?

n8622t

My Feedback: (8)

Definitely, I have two Ray English motors

radfordc

My Feedback: (14)

Sorry, wrong thread....should be in the FG60 thread.

n8622t

My Feedback: (8)

https://youtu.be/ffUehgpp8Ug
ForcesR look at this video and you may have a better perception of what Ray has done to the intake as compared to your engine... hope it helps

ForcesR

The video shows the Ray English manifold modification for the FG84R3 is different than what Saito has offered with the new FG90R3.

n8622t

My Feedback: (8)

Very interesting ...they should have used Rays mod. All the cylinders run the same temps with his intake mod