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General Category >> Rubber Side Down! >> head intake bolts center to center, 70 or 72mm??
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Message started by axa on 12/30/13 at 06:42:33

Title: head intake bolts center to center, 70 or 72mm??
Post by axa on 12/30/13 at 06:42:33

well im looking to get the proper intake flange for my new vm36 carb... well i hope not to end up sounding silly here but Ive now measured the head intake bolt center to center holes twice... i get 72mm....
But every part Ive found, as well as ever post Ive found mentions a part that measures 70mm... such as M-VM36-200
now it's rubber so such a small deviation should not be an issue, but id rather get the ideal part if it even exists.

so what is the story here, or have i entirely lost the ability to read my caliper???  :-[

Title: Re: head intake bolt measurement 70 or 72mm??
Post by S-P on 12/30/13 at 08:36:06

Well, bottom line, it's better to be 2mm too short than too long if it's going to bottom out in the hole.  ;)

Title: Re: head intake bolt measurement 70 or 72mm??
Post by Dave on 12/30/13 at 09:16:53


292E3F2C3F342A3B2F365A0 wrote:
Well, bottom line, it's better to be 2mm too short than too long if it's going to bottom out in the hole.  ;)


He is looking for the center to center distance between the holes on the flange......not length of bolt.

Title: Re: head intake bolt measurement 70 or 72mm??
Post by S-P on 12/30/13 at 10:42:15

Dang bi-focals..... :o

Title: Re: head intake bolts center to center, 70 or 72mm
Post by justin_o_guy2 on 12/30/13 at 22:28:09

2 bolts, 4 nuts, put the bolts in centered up, nuts on both sides, then measure from inside of one bolt to outside of the other. Thats the distance, center to center.;

Title: Re: head intake bolts center to center, 70 or 72mm
Post by axa on 12/31/13 at 05:17:14


796660677A7D4C7C4C74666A21130 wrote:
2 bolts, 4 nuts, put the bolts in centered up, nuts on both sides, then measure from inside of one bolt to outside of the other. Thats the distance, center to center.;


that or just 2 bolts alone, measure outside to outside, then subtract the diameter of the bolt...
i get it, but no matter how this measurement is made, it comes out to 72mm.  Every part ive found measures 70mm.

Does anyone have a part number the vm36 manifold we use on this bike?

Title: Re: head intake bolts center to center, 70 or 72mm
Post by Dave on 01/06/14 at 11:39:38

I don't know of anyone that has ordered a rubber spigot themselves.  I bought mine from Lancer.  When I looked at the price of ordering a carb from somehwere else and paying postage, then ordering a slide and the jet selection from somewhere else and paying postage, and then ordering a cable kit and paying postage and adapting it to fit....and the time I was going to spend tracking all that stuff down......I didn't feel like it was worth the few dollars I might have saved.  When I was doing my carb I was pushed for time.......and I got it installed and running with just one order from Lancer.

What size are the holes in the spigot vs. the bolt size of the Savage Cylinder?  I suspect there is enough clearance that the 70mm must work on the Savage (just a guess).

Title: Re: head intake bolts center to center, 70 or 72mm
Post by axa on 01/06/14 at 18:32:18

well apparently mr Lancer is not monitoring this post or keeping the secret to himself.  his right either way.

Anyway, you can use part # M-VM36-200, i received mine the other day and its fine.
It has 8mm bolt holes, so i just plugged those and drilled out new ones, for the 6mm bolts.
But since both combinations end up to be 78mm on the outside measure, you dont really need to do this, just tightening it down tight should be suffice.

i didnt order my cable from barnett yet because i haven't finished fabricating the frame and deciding on risers, but doing this yourself will save me/you over $150.
And that includes carb, needle jet, 10 main jets, a few pilots, flange, and 75$ for a cable, but doubt a cable will cost that much.
The choice is yours, but i wouldnt say that's just a few bucks.

I suppose if your in a rush and not doing this for fun you might find it a bothersome, but i dont know many who find hot rodding a chore.

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