bigtee

What parts from the new 748 will work on the 747? Thanks for any input.

dan_vector

iTrader: (27)

The new Front steering blocks are the main thing. The rear hubs also fit so you can use the aero disks. The rest of the suspension blocks and arms are the same as the 747 (albeit hard versions are supplied as standard on the 748).

bigtee

I notice the part number for the rear hubs for the 748 is the same for the 747 804242. Did they come out yet with the rear hubs for the aero disk setup?

GPXJOE

iTrader: (1)

as i understand it, they let go of the old rear hubs and used the new type that can fit the rim covers and used the same part number. so if you order one, make sure you ask the vendor first if its the one where the rim covers can fit.

Evo 13

iTrader: (2)

Has anyone ran shorter than stock doggones in the rear? If so, which ones?

I'm trying to bring the wheels in a bit and need shorter doggones.

TJames987

iTrader: (11)

Anyone know why my clutch wont engage till almost wide,open tbrottle? ,i have preload,spring all,the way loose. Could,it,be clutch gap? ,,,thx

dan_vector

iTrader: (27)

Clutch gap should be 0.6mm max 0.7mm. Which clutch are you using (true motion or centax-3)? Also is your engine set right? I.e is it extremely rich because that will do the same thing.

Actually there are a few reasons why this could happen but if you've built it EXACTLY as per the manual then it should work so that points to your engine being overly rich.

You ought to find someone local to you who knows what they are doing to check what you've set.

TJames987

iTrader: (11)

Clutch is working fine now, I just need to find some of the tiny .10 shims that fit under the bearing in the clutch bell (the endplay is too tight but spins freely). U were right my engine was really rich and I think I can tighten the spring down a little now because it is all the way loose. Thanks for the advice.

Also I used my friends advice starting shimming the clutch bell just enough to clear the clutch shoe then adjust the play on the endbell. This is contrary to the serpent instructions but it works now and didn’t before. I was able to get about .6 clutch gap using this method anyway (measure between the clutch gear and the top hat collet on the endbell with all bearing removed except for thrust bearings)

dan_vector

iTrader: (27)

Do it in accordance with the manual. I don't really agree with your friends method. The method in the manual is absolutely correct. Also measure with the 2 small bearings installed just leave the big one out. The small bearings add stability to the bell to enable accurate measurements. Serpent sell packs of the 0.1 shims however plenty come in the kit to get the clutch within limits. You can also use shims behind the flywheel collet in case the end float is really excessive.

TJames987

iTrader: (11)

Any ideas on an clean on/off switch solution for the 747? Right now im just plugging the rx battery straight into the receiver.

Also I think I have the clutch working well now. The only thing is I had to tighten the clutch spring so the engine doesn’t stall when it catched too early

dan_vector

iTrader: (27)

I have a Sanwa extension cable double trapped to the rx protection cover and route the battery lead to that. Nice clean install.

snuvet75

iTrader: (16)

Does anybody have a hard time fitting Picco EMX on 747? I just got the EMX (my first Picco) and the engine mount doesn't move enough for proper gear mesh. 2 speed and pinions are all stock. It's not a problem due to different engine mount in 748. Please advise.

Serpent-Dan

iTrader: (18)

Put a few shims under the engine mounts

snuvet75

iTrader: (16)

Dan, my problem is gears are too close to each other. Raising pinions will worsen the problem.

dan_vector

iTrader: (27)

The 747 is a bit tight. You can open the engine mounting lug holes 0.5mm each to allow a bit of movement (I used to do this on 1/8th cars years ago with Picco engines). Just use a dremel with a 3.5mm drill bit. It won't affect mounting the engine in other cars. Novarossi engines for example have bigger holes than the Picco as standard and that probably is the reason why the Picco is a bit tight in the 747.