70 Magnum

[ruppluver]

I'll be working on this sled,when I get the steel roof put on my storage shed.This is the one I got from upmagnum & krazy,last fall.Just took it out of cold storage.The picture below,is a picture I got off line,it's not my engine!!!

The Sachs 440 I have,is missing the "Y" pipe & exhaust header.
I'll be needing what is pictured.Anyone? I have seacoastrupp
looking for the pieces I need.Measurements on the Y pipe are
as follows: Exhaust ports are 5" on center. The stub pipes,
when screwed into engine,are 6 1/4" outside to outside of
pipe by the jugs.Now on the ends of pipes,a piece has been
added to increase size of pipe.They measure 6 3/8" outside
to outside,on the pipe ends.The diameter of the pipe is as
follows:at the end=1.63" or 41.06mm.Pipe up by jugs,1.48" or
37.69mm. Also need the header pipe,both
pieces would help speed this build up.I have the muffler.


Putting it back together,this is as far as I have gotten.I
will be using parts I have in inventory,some might not be
the same as when sled came from Rupp.I pulled the original
green Sachs seals.Timing/points will be checked & reset,if
needed.Wow,a whopping 35hp.

[74nitro2]

Dan,

   Looks like a "fun" build.  Talk to Ruppsup he probably has those parts.  

[ruppluver]

The tear-down has begun,TODAY!! I'm not working very
hard at it.

The drivers & idlers look ok.Just kidding. I'll
sort through the parts & pick new stuff out for this
sled,depending on the parts.NOS track,new rear idlers,
repopped drivers.......

[lemans1955]

Looking good Dan, I'll be starting my 71 this summer.

[ruppluver]

Heres the tunnel stripped down & cleaned.Put a few
parts back on,but I need a spot welded on the rear
of the tunnel.
The center drive track that came out of this sled,was a Rupp#14300.
It was quite THICK & it was HEAVY!!! It had a few broken
track/drive bars.BUT I've got the track covered,nice
to have EXTRA tracks when they are needed.
The track,also had some bolts in it,that wore into
the strength bars,on inside,TOP of tunnel.Must not
have had much traction,so put some bolts for gripping!!

[mrmotors]

Dan, you have a PM.

[ruppluver]

Here's some of the suspension/drivers that are ready.
Still have a few more to do.I used "Dan's" new idler
wheels on here.Have been using this design for over
2 years,with no problems.Red & black wheels are NO
longer available,so yellow will be used.Color means
nothing,as LONG as they WORK!!!

Yes,this is the "correct" 70 Magnum tunnel with the
factory gussets,and factory,crummy welding!!

I will use the steel engine plate,I will sacrifice
the aluminum parts for steel parts[engine plate & bumper].
Am I missing other hard to find aluminum parts strictly for
the 70 Magnum

[drrupp]

Dan, What idler's are you useing on the front?

[magnumed]

Dan, the motor plate would be steel, just the bumpers you are not using, often times the steel is powder coated and resembles the factory aluminum bumper. I don't think you missing any other aluminum parts but I never had a complete untouched 70 magnum.

[drrupp]

Ed, check out the second picture down in this thread that is the original engine mount. It is an aluminum plate with the aluminum cross pieces.

[blueleader]

What about the aluminum fuel tank brackets that go under fuel tank? Those have to be rare, as I have not seen many of those on 70 Magnums>

[ruppluver]

Those tank mounts were aluminum also? Never knew that. Anyone have any & if so,got pics? I'd like to see them.

[magnumed]

Mar 31, 2016 6:13:11 GMT -6 drrupp said:

Ed, check out the second picture down in this thread that is the original engine mount. It is an aluminum plate with the aluminum cross pieces.

Yes I forgot about that.

[blueleader]

Yes I have seen them, I have a pair on my 70 Magnum! They look the same as the steel ones you have, just made out of aluminum.

[magnumed]

Mar 31, 2016 16:08:11 GMT -6 ruppluver said:

Those tank mounts were aluminum also? Never knew that. Anyone have any & if so,got pics? I'd like to see them.

I tried loading the pics of a set I put on my 71 magnum, no luck. Ed

[ruppluver]

NOS Track going in.

New bearings in the secondary clutch.New brake pads,
all parts cleaned & checked over.

Tomorrow should be the end of the cooler days.Will
start stove & run it out of fuel.Will put more of the
suspension in.You are probably getting sick of black
on my sleds,BUT I like it!! Red,black & aluminum,ok by me.

[drrupp]

Dan, on those '70's sleds you need to put the belly pan on before the ski spindles.

[ruppluver]

I have the belly pan,but it needs some work. I put the spindles/skis on[to hold it to the cross],so I can get the track put in. When the track is in,I'll fit the belly pan,it will be one of the last things to go on.Yup,the 70 had to be different.

[ruppluver]

Track is in & adjusted.Will need further adjustment
at a later date==WINTER!!



When I ordered flange bolts,I never thought the heads
would be this big/thick! The 9/16" wrench,will NEVER
round this head off.

[ruppluver]

I'm still rounding up parts.Found a pr of skis,that came in on a 71 440WT,they have no HOLES for ski shocks!! Would that be the correct ski for Magnum? Also have 2 springs per ski,with square,small bent up ends. They have surface rust,which should clean up[might leave some small pits,but anything is better than the brown,rusty look].

Before.

After

I'll put a coat of wax/polish over them.Plenty good
for a rider.