The valve adjustment would still be the same. It sounds like you might not have it in time right. When you line the T mark up and the piston is at TDC, make sure the cam lobes are facing down.
03 Rancher 350 Help???
I had to tear down my engine to replace the crankshaft and connecting rod, piston, piston rings, and had to get a new cylinder due to it was already bored out to max. So I went back to stock piston size. I got it together today and primed it with oil and everything and when I went to go fire it up all it would do is back fire. I took it back out and tore it down to make sure all the alignment points were correct and they were. My question is since I went back to stock does the valves need to be adjusted because of the smaller size? Or could anyone have some things I should check or try? Everything was built by the book.
1 - 6 of 14 Posts
Both valves should be closed all the way when the piston is on TDC. Do you have the key groove in the crankshaft pointed straight up and parallel with the cylinder stud bolts like it shows in the picture below and do you have the other marks lined up like it shows below?when it is at TDC all three of the internal markings are aligned but the exhaust valve is open just a bit at TDC. I don't know much on how it ran before I took it apart. I bought it for 800.00 and was going to change rings cause of smoking then found more problems I have maybe 1200-1300 in it now. I did test drive it and drove it around the yard a few times before I decided to take her down to keep from messing anything up worse. All it does now is backfire and I didn't do anything to the valve or valve springs
If the cam lobes are facing down, the valves should be closed unless somebody adjusted the valve adjustment way off. Are you sure the push rods are sitting in the center of the cam followers? Also, you may have a bent valve.yes I have all that correct and the exhaust valve is still slightly open. Should I adjust the lifter to be closed? Their is three different places that have to be aligned that I have found in my book.
Can you remove the valve cover and check and see if you have any valve clearance? If you have valve clearance and the valve is still open, then the valve must be bent.
Yeah, once you get it together, the push rods can't move out of place.I am sure that they are in the center of the cam followers. once together they can't move from center right?
If the piston is on TDC and the cam lobes are facing down and all the timing marks are lined up correctly, then I don't know what it could be.
Can you tell by looking at the push rods if one is up higher than the other or if one of the rockers has been adjusted a lot more than the other one. Neither cam follower should be sitting on a lobe, so neither pushrod should be pushing the rocker arms up and opening the valves.
That's great, glad you got it fixed!
1 - 6 of 14 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Honda ATV Forum
We’re a forum community dedicated to Honda ATV owners & enthusiasts. Come join the discussion about upgrades and reliability for your Rancher, Foreman, Recon, FourTrax, Pioneer, and more!
Full Forum Listing
Explore Our Forums
Top Contributors this Month
View All
oldskool83
40 Replies
THEHONDABUILDER
12 Replies
Eric the red
11 Replies
Recommended Communities
