HPI Install RD

[Czakky]

 

[SUPERTUNE]

Mike forgot to leave me a key to the gas tank and a licence plate to finish the tune...he mailing them and I get to finish next week.
Chuck

[SUPERTUNE]

Well had to pick the tank lock and put my tag on it from my RD...(don't tell) to ride it Sunday!   

Ready for the first ride...pipes were de-rusted with phosphoric acid, rinsed with water, immediately sprayed with WD40 then sanded with triple 000 steel wool, then washed with lacquer thinner and 3 coats of mop and glow to go and burn in.








The jetting we had in it before now is too lean off the bottom for throttle response. I'm thinking with the rev's climbing much faster with this lightweight HPI rotor and the more aggressive advanced timing coming in as soon as you rev it up.

After a quick ride up the street the brakes were total crap!!
Pistons really crappy...used a new OEM Yamaha kit.






Needed to re-adjust the the clutch cable adjustment with a spacer in the cable holder to work with the motocross bearing clutch lever.

As with most of the shelf bought rearset assemblies the shifting linkage sucks on them!
So re-did it like I do on most of them.













Mike did have Nick's Dyna conversion CDI, but Mike left the key on one night and burn it up and is the reason for the HPI install.
Mike's stock carbs were too old and corroded to do anything with...so bought a pair of new VM28's and changed out to the primary needle jet conversion (VM28's come with bleed type like stock)

Started jetting: 210 main
                        35 pilot
                        169-P0 needle jet
                        5DP7-3 needle
                        2.0 air jet
                        2.5 std. slides
Was on 32:1 last year with the STG 1 engine build we did when the bike was built.
Then ran 40:1 after some tuning.
Banshee intake manifolds
YZ125 reeds (I think... have to look again)
TSR Barlow designed boost bottle
Uni pod filters (all foam)

Todays ride is on 50:1 premix on BelRay SI-7  2 stroke oil.

[SUPERTUNE]

Changed out the pilots from 35's to 40's at 2 turns out on the air screw and bumped up the idle.

Used some competition brake pads and threw out those stupid anti-rattle shims! I want brakes... don't care if they are a little clicky, and don't want a spongy lever feel and the drag they have when using them!
Brake is 100% better and not even broke in all the way yet...

Still want to try dropping the needle one notch and going to a 42.5 pilot today.

The shifting work I did is TITS, may play with different hole settings, but really good as setup in the pics now.

Bike has 14-40 gearing and will have Mike go to a 39 rear as the motor pulls it no problem and needs a smaller sprocket to gain some pipe to chain clearance with these JL's.

Going to make a rearset spacer to move out the pipe mount just a little more for this issue.

DON'T buy china crap on ebay for the rear brake light switch...garbage!



I missed dinner at home due to the late brake job at the last minute!
So out to Johnny's for Pizza dinner!





Still waiting on the kickstand relocation kit from HVC so have a taped towel on it.

[paul1478]

It is all about your attention to detail that always blows me away Chuck. All the little things add up to one great running AND riding bike.
Love that 75 350 look/color.

[m in sc]

sweet. so, how do you like the HPI overall then?

[SUPERTUNE]

Dark out now after a brake job...
So time to check the LED's!

https://photos.imageevent.com/supertune/mikemrd350/20191103_202604.mp4

At Johnny's.

https://photos.imageevent.com/supertune/mikemrd350/20191103_214357.mp4

https://imageevent.com/supertune/mikemrd350?p=71&n=1&m=-1&c=3&l=0&w=4&s=0&z=3

Getting close on jetting...loved the 3rd gear power wheelies this RD350 did last night!








More to come as I get to the finish on this one...  

Chuck

[SUPERTUNE]

It is all about your attention to detail that always blows me away Chuck. All the little things add up to one great running AND riding bike.
Love that 75 350 look/color.

That's how I roll...

[SUPERTUNE]

sweet. so, how do you like the HPI overall then?

So far really good. Need to do more riding using the headlight on high for like a 50-100 mile trip and see how the charging system keeps up, but running seems good there.
Have the plug gaps set at .022 using NGK 5K plug caps with std B8HS with no tip for those caps.
C

[2t Fan]

can we use 5K caps with BR8HS ?

[SUPERTUNE]

can we use 5K caps with BR8HS ?

I haven't tried that yet.
C

[SUPERTUNE]

Rained yesterday...didn't ride bike. Worked on it... I made a spacer for the left side rearset and pulled the carbs and changed
the pilot to a 42.5 and leaned the needle one position by raising the clip. (at the #2 clip from the top)

If and when I get done I can try a resistor BR8HS plug.

KOSO tach seems to be close now that it's programmed to #2 setting other than the shift light comes on too early
for this little Team Scream Racing STG 1 built engine!
C

[turtle]

Chuck, the shift light is adjustable on the Koso tach.. you can set it wherever you like.  ;D

[m in sc]

i had to run a br series plug & resistor cap with the mzb/zeel setup for a few years on the rd i have, to keep it from scrambling the box. I eventually fit a ferrite choke  and was able to run with resistor caps/non resistor plugs. its definitely cleaner revving now, no reason to run both especially if its not scrambling the tach on that bike. Just my experience.

[SUPERTUNE]

Well was out of town a couple of days and bad weather. I did get it out for a long ride and felt like I wasn't getting enough fuel to the carbs.
In these pics I mod the gas cap vent holes to double the air vent size.

Stock '75 RD350 cap



I slotted this piece.



Drilled extra holes here on these two parts.





I also added handle bar kill switch and disconnected the stock made in china repop throttle/kill toggle switch as it was acting funny.

Need to take a pic...Forgot.
I took the stock petcock off and apart and peeled out all of the stock screens and just using so nice inline 1/4 Visu filters.