cam plunger?

[redsurdaddy]

my friend can't get his 400 started now that he put the motor back together and I read somewhere on here something about a cam plunger (?) and I thought maybe he forgot to install it. can anyone post a picture of one or tell me what it would look like. he said he found something that looks like a small dowel pin and a spring, lol and i thought that might be it. where does it go? in the head or something? i've never saw one apart and don't know anything about internals.

[REDRIDDER]

that little pin and spring is indeed the plunger unit.It goes in the end of the cam if i remember correctly the left side of the cam.

[REDRIDDER]

here you go.

[redsurdaddy]

thanks a lot, i'll give him a call

[GPracer2500]

Close, but that's not the spring and plunger. The parts pictured above all are contained within the stock cam's decomp assembly. The only way to get to them is to press off the cam sprocket carrier and disassemble the decomp unit.

This is the spring and plunger:
http://i34.photobucket.com/albums/d133/gpracer2500/decomp.jpg
[image stolen from JOEX]

They go (spring first) in this small hole in the head.
http://i34.photobucket.com/albums/d133/gpracer2500/plungerhole.jpg

They are only needed if the decomp unit is on the cam. Typically, only the stock cam uses the decomp. So if he's got an aftermarket cam that doesn't have a decomp unit on it, his starting problem is something else.

[redsurdaddy]

Thanks, I sent him the pictures

[Choppers]

what if you don't have the spring and plunger but have a stock cam. i can't get mine started now.

[hillbilly426]

i have the spring and plunger .if you want them let me know

[ZSK]

If you don't have the spring and plunger you can remove the decompression assembly from the stock cam.

[Choppers]

i am just going to order a new cam caue mine has some wear but i was just wandering if that could make it not start

[GPracer2500]

Originally posted by Choppers
i am just going to order a new cam caue mine has some wear but i was just wandering if that could make it not start

Of course. It will not start with missing pieces.