engine head woes!

[ayk_driver]

ok 2 problems... maybe only one... when u put a helicoil in a cylinderhead of a real engine its ok... can i put a helicoil into the head of my r.c engine?

if not question 2... does n e one know is the head of a kyosho gs21r will fit onto the gs21.. its the older mp-7.5 rtr buggy engine b4 th "r" came out... plz help :(

[NITROINVAINS]

whats a helicoil? :o

[mugenX5]

You should be able to put a helicoil in the head. I'm not sure what kind of luck you've had with real engines, but you may want to put a dab of loctite on the helicoil to prevent it from moving. Is it a 1/4-28 or 1/4-32?

Keep us posted.

[Duster_360]

If you install the helicoil correctly in the correct hole size for the coil, you shouldn't have any probs. The repair will be as good as the original (maybe a little stronger). Its best to use a kit made for the size you are going to use for the repair, that way you have the right size drill, the right size and kind of tap, the correct tool to actually install the coil and the right size coil. To repair a stripped threaded hole you've got to use a bottoming tap - cuts thread closer to bottom than a taper tap, and you need all the thread you can get in that kind of repair. I've used them a lot and they work.

They have saved me a lot or money - mostly on 1:1s and motorcycles, but I've used them to save the strg knuckles on my HB Lightning Pro1. I was so impressed at how well that worked and how strong it is, when I bought another Pro1, I just went ahead an helicoil'ed both knuckles. Better than new.

[ayk_driver]

nitro- a helicoil is basically new threads for a stripped hole... like a sparkplug hole in a real car...

duster- im gonna be doing it at work where we do helicoils on real cars so im 99% sure they will have everything for the size of head... hopefully they do :D

i will keep u all posted...

no ideas on the GS21R head n e one?

[pleaseletmeon34]

The early one was called a GS21R also. I think they just called the newer one "updated version". I know I still have the parts list for the early version (came with my landmax). If it has the same bore it will probably work.

[pleaseletmeon34]

NOTES FROM OUR TECH DEPARTMENT
This is the Replacement Cylinder Head for the New Kyosho GS21R Engine.
This will also work as an optional Cylinder Head on the Older GS21R.


FEATURES: Aluminum Construction
9-Fin Design to provide more cooling than the stock head.
Anodized Black in Color
X-Shaped Design

INCLUDES: One Black 9-Fin Cylinder Head
One Silver Head Gasket

REQUIRES: Nothing

SPECS: Height: 1.5" (38mm)
Diameter: 2.1" (53mm

I got this from here
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXAVV8&P=7

[ayk_driver]

i looked in my instructions for the car and it lists it as the GS21... so i dunno... if i could find a head and try it iwood no for sure :)

[cool head]

i've never seen a cyl head with threads in it. are you talking about the block? i've gone a size up and just drill a bigger hole in the head and cut new threads in the block.

[ayk_driver]

i've never seen a cyl head with threads in it. are you talking about the block? i've gone a size up and just drill a bigger hole in the head and cut new threads in the block.

u must have a seperate button head... most cylinderheads have a threaded hole where the glow plug goes into...

[cool head]

my bad. thought he was talkin head bolts for some reason.

[pleaseletmeon34]

Question? Does your head have 4 or 6 screws holding it on?

[ayk_driver]

Question? Does your head have 4 or 6 screws holding it on?

4 screws hold on this head...

[pleaseletmeon34]

Was doing a little digging and found these engines. GS21R (new, black head) part #74722, GS21R (old, blue head) part #74721 (I have this one. Came out around the same time as the MP-5), GS21X (silver head) part #74341. All these have 4 bolt heads and are interchangable. GX21 part # 74023 has a 6 bolt head. Haven't found any info on your engine.

[ayk_driver]

my head has a goldish coppery colour

[pleaseletmeon34]

The numbers I listed are engine part numbers. You said you still have the instructions do the list the part number?

[ayk_driver]

i cant find that part number... god this is frustrating.... the engine i have is almost identical to the gs21r except the head color and they call it the gs21...

[pleaseletmeon34]

Your instructions don't have a number like any of these three?

[ayk_driver]

it does but it lists every engine part BUT the crankcase..crack..piston and head... argg so frustrating....