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auto decompression pin

This is a discussion on auto decompression pin within the Engine forums, part of the Technical category; Hi, I'm installin a new cam and didnt notice how the small pin that goes into the cam is installed, with the small end sticking ...


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Old 10-26-2011, 07:39 PM
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auto decompression pin

Hi, I'm installin a new cam and didnt notice how the small pin that goes into the cam is installed, with the small end sticking out or the big flat end out? Thanks for any info. also do i need to install the roll pin in the end opposite the cam gear?
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Old 10-31-2011, 04:35 PM
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nobody knows?
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Old 10-31-2011, 05:14 PM
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Can't recall what it looks like, but the end that sticks out (and 'rubs' against the cam) should be rounded. Just make sure that when the decomp weights sling 'out', the little nub drops INTO the cam... it should protrude at rest.

I don't think the roll pin is required... my original had it, but my replacement didn't. To be honest, I have NO idea what it's for...I don't think it's to move oil around and lube the bearing surfaces of the camshaft, but maybe it's useful for something?
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Old 11-01-2011, 06:47 AM
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thanks Craig from ruttingrhino and canukelhead for the info and manual
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Old 11-01-2011, 11:05 AM
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Your welcome...

I had a faulty decompression with 11:1 piston and it separated the CDIs starting capabilities quickly when motor was cold...

What a pita... but that's why we sell the MSD now...it uses the stock cdi starting which is unequaled IMO...

Good luck with it...!
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Old 11-01-2011, 12:59 PM
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Yes thats one of the things i want to order from you, that msd doesnt add a bunch of timing to the motor compared to a dyna fx cdi does it? I have my stock one in there now, and also have a dyna something cdi also. Im am rebuilding my motor right now with a 11.1 piston and the hed is being ported with kibelwhite springs and a stage 1 raptor cam. I have a aftermarket exhaust and dont want a ton of advance i the ignition.
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Old 11-01-2011, 01:32 PM
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Well first off if you do order a MSD from me I appreciate that very much...

As for specifics with regard to timing and comparisons to the dynatek IMO you should get your information straight from the manufacturers...

Not sure about Dyantek but MSDpowerports.com has a 1800 number you can call for that...

Both MSD and Dynatek make programmable cdi for your machine...I don't sell either one...

IMO...the only reason to get a programmable one is if you have 12:1 or more compression and running on race gas...or if absolute top speed is a priority for you...in which case I would be the msd programmable...

Others may disagree... but there are tons of people using the Dynatek with 11:1 compression on 91 pump gas with no additives...

I have a customer who has a 720 stroker using the msd I sell with 11:1 and as far as I know he is happy...

camo660 recently got one for his new motor running 11:1 ... don't know if he has run it yet...

I ran mine at 11:1 with all the fixed curve cdis on the market...they all have the good and bad points...

The main thing you need to know is that the one I sell has an 8,000 rpm rev limit...most built motors running 11:1 on pump 91 can pull 8200 to 8400 rpms so it would probably limit your top speed about 3-5 mph...

You should be able to hit 60 with the msd and a sheave mod at 11:1 with a cam...

If that is important to you to be unlimited on rpms for absolute top speed then you would be wise to get a programmable one IMO so you can adjust your ignition curve and be unlimited...

The Dynatek has 9,000 rpm rev limit which you will probably never touch in high in a rhino with 11:1... but you are stuck with the fixed curve it has and it would not start my 11:1 cold with a stuck decompression pin...
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