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Mat Oxley 1986 IOM TT


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Messages - SUPERTUNE

#1
Turning Wrenches / Re: Air leak around spark plug
August 24, 2020, 07:23:05 AM
Try torquing to 17 ft-lbs with a new plug and see if it stops the leak. If not, a spotface machining on the seat is needed.
Like this...
Chuck



#2
Turning Wrenches / Re: HWY millage worse?
August 03, 2020, 10:31:26 PM
Believe it or not... Proven, My STG 2 RD400's builds get close to 38 miles per gallon on the highway at 65-70 mph. (with a few hit it hard race your buddy and passing cars)
16-39 gearing, YZ85-VF reeds, TM34's on Uni-Pods, Vape CDI
Chuck
#3
In the 2nd pic... you went the wrong way. Should be below, not up as shown.
Remember TM 34's use 8mm fuel lines (not stock RD 6mm) and use 3.3 mm needle and set size. so at stock setting on the TM 34's they will leak,
When looking from the side in relationship to the float base gasket, the float arm needs to be at 9:30 or 10:00 o'clock.
(lower fuel level than stock)
Chuck
#4
Turning Wrenches / Re: leaner needle?
August 03, 2020, 10:03:24 PM
Quote from: rd400canuck on August 03, 2020, 04:32:43 PM
Hey guys... has anyone run the stick needle on the 2nd clip to lean it out one notch on a stock set up?

I have all stock except the oiled air filter and i run a 25.7 pilot (stock was 50) and a 140 main. I run the air screw at 1/4 out otherwise it bucks like mad when i close the throttle. I think my current setup causes the 1/8 to 1/4 throttle to be too rich and i get that burbly spot between 4 and 5000 rpm on the hwy and bombing around town.

Is leaning the needle something one can do to clean up that area of the rpm at steady throttle?
A #25 pilot was stock on all RD400's not a 50...

I always tried to help this issue and found that when I did drill out the ball and re-drilled and tapped for a removable air jet I used a .7mm air jet and not the stock .5mm air jet and did help much better with the clip on the #3 position using 30 pilots.
(pre-mix 40:1, stock air box with Uni filter, drilled stock baffles in stock pipes)

Use a 5 X.8 tap and re-plug with a set screw where I drilled out the ball. (caution: tap only 2-1/2 threads so the set screw is not too deep!)
I did have this posted on the old forum, unfortunately is now lost in space...
Chuck
#5
General Chatter / Re: Happy Birthday Frank B
August 03, 2020, 09:42:26 PM
Happy birthday Frank!
You have done a fine job with the upgrades on Dave T's RD400 you bought!
Chuck
#6
Turning Wrenches / Re: Check out this stock porting
July 25, 2020, 09:10:39 PM
More..





#7
Turning Wrenches / Re: Check out this stock porting
July 25, 2020, 09:06:48 PM
They look like this when I port them...
Chuck



#8
Hi Rob, Only 1 apology is needed!
Yes, to using 1 of the #41 shim to replace the breakage prone wave washer, still will use a #41 outer one with the clip
Yes, you can use a RD350 shim in place of the 2 spring washers that came on the 400's kickstart shaft.
I have to stock these shim washers due to the wave washers broken or worn badly and you would be surprised at how many RD 400's and 350's kickshaft shims are missing when I do rebuilds!
Chuck
#9
I adjust all the big TM carbs floats down some as with the big petcock conversion and the stock 3.3 needle valve size they don't need to be so high like in a wide open throttle dirt bike!
Chuck
#10
Turning Wrenches / Re: Check out this stock porting
July 25, 2020, 12:12:22 AM
400's are nice compared to the older 350's!
All RD's need to be ported as far as I'm concerned!! Just old 70's crappy castings...
C
#11
Always check the throttle tube, if broken or grip rubbing the bars will always hinder drag.
I use Tri flow for a lube.
Chuck


#12
Wrong,
Not on the kick starter shaft...
It's the wave shim on the tach/starter idle gear to the clutch hub gear.
Goes on the shaft first, then the gear, then a flat washer shim and then the circlip.
I like to just throw them away and buy the flat washer shim to replace the wave one, will never break again!
Chuck
#13
I like the Ducati 320mm with bluedot 4 pot R6 caliper and the XS400 14mm master.
Just did a this setup on Paul's STG 2 '76 RD400
Chuck




#14
Quote from: motulman on July 07, 2020, 08:00:39 PM
hey chuck its been a long time,  does this installation cover the daytona also?
Pretty much the same as RD400's, the difference with a Daytona model is the headlight signal relay yellow wire from the stock stator.
I don't remember what I did exactly...I think I just may have jumped the relay in the headlight shell to turn on with the key and not use the relay.
Chuck
#15
Show Off / Re: Got me another rd
July 08, 2020, 07:49:41 AM
The bars look like clubmans and mounted upside down... :eek:
Chuck