i was throwing my engine together after finally getting all of the parts in, hot rods stroker crank, piston, web cam .430/.430, etc. etc., and the crank/cam wouldnt turn past the exhaust valve opening, on the exhaust stroke, with the piston at the bottom of the cylinder, like the spring was in a bind. but, i turned the crank back the other way to see if the intake valve would open and it did fine, continued around to the exhaust lobe and the valve opened fine (at the top of the exhaust stroke), this time i saw the piston at the top of the cylinder, and although it looked like the piston might have touched it (thats another problem i can address) it went on around in reverse till the piston got at the bottom of the cylinder, with the cam lobe on the other side of things, and it still was in a bind, even though having the lobe pass by the rocker once already, without a problem. so, i figured i might be having a problem with the bottom end or the piston/crank hanging, so i proceeded to take the cam sprocket off to see if the crank and tranny would turn freely and then i noticed where the lock pin on the cam had broken out of socket, and cracked the end of the cam. hopefully, it will be covered and they will replace it as faulty, cause i sure wish i was strong enough to break heat treated steel. feeling liek **** cause i really wanted to ride this weekend, i continued on with the troubleshooting and got the cam and sprocket out, and the crank turned freely all the way around, in both directions. i need some help on trying to determine what the problem is and also whether or not you think web will give me a refund, or will i have to try and weld it back myself. thanks.
web cam .430, grind 84 problem
- Thread starter tiimbo
- Start date
Help Support Yamaha Raptor 350 & Warrior Forum:
My only thought (and i'm not much of an engine builder, just trying to help), i know certain cams require clearancing the valve covers a bit because of the extra movement in the valves and rockers and all that. Maybe something didn't have enough clearance and bound up, jamming it all up and breaking the cam? That might not even be possible with this engine, it's just a thought.
jasonp
Well-Known Member
tiimbo said:you can see where it's hitting in this one
and in this one what it did to my head
and in this one what it did to the cam
I want a pic of the cam itself and the needle bearing end.. Also what does the grind number on the cam say? I think you either have the wrong cam or one for a raptor..
20warrior00
Well-Known Member
that same thing happend to mine about a week ago except all the metal pieces are in my bottom end
jasonp
Well-Known Member
20warrior00 said:
The pin and the end of the cam broke? Was the bolt loose on the cam?
jasonp
Well-Known Member
the camshaft is actually made out of cast..
i dont have a pic of the back end right now, but it did say grind 84 on it. i measure the cam lobe to the best of my ability (1.99 pocket ruler with decimal conversions on the back from harbor freight), and it appeared to be the right size. from measuring the distance from the inside of the cam bearing to the part where it hit, there's just not enough room. in the book from web it did say for a big bear but i though these were the same engines. this is a pic of the new bearing...
jasonp
Well-Known Member
when you had the camshaft in the head did the rocker arms line up to the lobes of the cam or where they off? Looks like the pin broke because it was hitting the head or piston.. mabe even loose bolt as it looks like the end is galled from the sprocket. Is the bearing bottomed out on the camshaft and correct?
jasonp said:
i think what your seeing on the head is the flash from the camera, i was right up on it. the rocker arms did line up.
i know you guys dont like em, but i bought a hotcams stage 2 cause i was able to talk to the tech support team and they verified that i wouldnt have to do any modifications (i did believe you, but wanted to have it from them in writing) and also because the woman at web was such an asshole that i wasnt going to talk to them again. anyway, i got the cam put in, and it hit also, but only on the part that the web cam didnt grind off before breaking! i apparently have a defective head, or it had a problem during the manufacturing on it. however, i was able to make it work by getting a trusty old file and working on the head a little bit, as you can see in the pics. i've also included the pics of the web cam. after filing it down, the web still wouldnt fit. i had considered just buying another head from ebay, but since i already had this one P&P'ed and stuff put in i was just going to take the lesser of two evils and stick with the hotcams.
after all this was behind me, and i got the quad put back together this weekend, i find out the stator is bad from using jasonp's thread on warrior's not starting. it was apparently bad before hand, but the guy had told me the problem was with the CDI and not the stator, so i didnt even get one of those, but i am now. so i dont know if its going to run now with the cam mods or blow apart! (jk)
so i finally got the engine back together with the hotcams stage 2, and man it has a lot of torque. would it be advantageous to get a different cam, given my situation with the head having a problem, not allowing for a cam bigger than .390, and seeing how you guys have negative reviews for hotcams? or would it be such a small difference it's not worth the time or money?
20warrior00
Well-Known Member
jasonp said:
yea i think thats what happend
