This SIRIO engine feels great to drive.
More than enough power that propels the machine relentlessly.
Combined with the machine's driving performance, power slides and drift etc. are fantastic. But these may also be causing some problems. There is no problem with performance, but there are few small issues that I would like to report on.
The first issue relates to screws, which I picked up when I first inspected. The screws used in the engine mount are not strong enough and fell out. Of four screws, three fell out and only one managed to stay firm.
There is a groove in the chassis, which is used for screws to mount the engine, but no matter how tight the screws were put in, there was still some play. I rectified this by using a nut. This removed any concerns I had about screws falling out.
The next correction was on the muffler screw.
I didn't notice until I read someone else's report, and my muffler hadn't come loose. But I did it anyway.
The next issue was around the clutch area. After finishing the break-in, I had run a few tanks through and really opened it up. When the machine was idling, I could hear a vibration sound. Then the engine stopped! I thought the clutch spring had snapped, but when I disassembled, I found the clutch had melted…SIRIO is power!
As soon as I detached it, I saw what had happened. The clutch opens from the axis shaft on the flywheel, but I couldn't see the axis shaft. Due to this, the clutch couldn't open properly and wasn't fixed when it opened.
The proof was wear all over the clutch, not just in one area where you'd expect. I tried to correct with idling adjustment, but the screw wouldn't turn. I used pliers to turn the screwdriver, but all I got was a cracked screwdriver head. I checked the instruction manual and I was turning the correct screw, so I just gave up.
I tried reinforcing the clutch shoe.
The spring size looks like the same size as a 1/10-class and the one I had fit perfectly.
With this, the vibration sound was almost gone and the engine continued running smoothly. I recommend cutting the spring if it is too long, or making it shorter to change the spring pressure. But this won't be necessary if you can use the idling adjustment. I can't confirm if the engine remains stable at a lower idling setting, and as I can't check how the clutch is opening inside, I hope these parts are released soon.
I have future expectations for the chassis. It is reinforced with a torque rod, but due to this, strength is focused in the center so it is easily twisted in your hands. When I flipped it while driving, the center dog bone also bent. Will there be an SP Main Chassis released? I look forward to some improvements in this area.
The next issue might be related to vibration in the fuel tank, but air bubbles cause the engine to stutter and almost stop.
At first I thought I had tightened the needle too far, but even though the exhaust color and sound was fine, I opened the needle slightly. After running a while, the problem was still there…
I took the body shell off and freewheeled the engine and watched the tank and saw fine bubbles floating up the fuel tube.
I had experienced this with other machines as well so I stopped the engine and inserted an O-ring or other rubber where the fuel tank is fixed. (1 is already included). This was done to test the impact of reduced vibration.
It wasn’t a perfect result, but it was a big improvement.
I suppose this could be an issue for this machine.
Then I ran a lean mixture for an extended period and noticed a slight overheating. An optional engine head might become a necessary item. Looks better too. But as I can't get one soon, I will manage by adjusting the needle setting.
Oh yeah, and an optional muffler would be great too. The standard one is plastic so I am a bit concerned about the join between the manifold and the silencer.
Ball bearing takes any play out of the steering and other sections are better than other brands around.
Unfortunately for my hobby, I prefer on-road. R/C has been banned from my usual driving place, so I put on some drift tires and found somewhere else. I noticed an optional 2-speed transmission for on-road listed in the instruction manual so I can’t wait for this to become available! I felt the engine was louder than a 12-class so I have to be careful where I drive it. The nearby park is full of people so I would like to try somewhere near the sea.
My apologies for the amateur faultfinding, but this is the end of my report.
I hope that this machine becomes the base for many variations in the future.
Also, I would personally like the Mini-Inferno 09 in the VRC. It would be great as a refresher or mascot since there is already a stage with a jump.
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An engine changes a screw of mounting it
Because I am running out of time recently, I enjoy it for a work return.
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