honda400exrider42

Thanks, not really sure if it needs replacing or not yet, the wheeler ran great before i tore it down(I dont even know how, one side of my piston was toast ) ill have the cam checked out, thanks.

Hey, im not sure if the cam is even screwed or not, I need to have it checked out.(there is a piece that seems to be a little loose near the cam sprocket) But the wheeler still ran like a bastard before I tore it down, so im not sure. But if the cam is bad, and I decide to buy a stage one or stage two hot cam, are there any other mods that have to be done to the quad to install the new hot cam, or can I put it in, set my timing, and be good to go? Thanks

Hey a buddy of mine just bought a 2004 raptor 660. The atv smokes on start up and then stops smoking. I asked for the color of the smoke, he said a light blue. Im guessing its valve work? If anyone could verify this and maybe specify what kind of valve work hes looking at?

Anyone know..?

hey, me and a buddy have been working on his 2003 ltz 400 for a week or so now. He has bad compression and starting problems. We tore down the top end, expecting to find a bad ring or something along those lines, all of his rings were stuck shut inside the piston, we cleaned out the rings and ring seats, freed them up. Still bad compression.. So we tool the valves apart, found out that he had a couple of slightly bent valves, we replaced those, got the wheeler back apart, still low compression and wont start. During these tear downs, we did not replace the gaskets, as you can guess they are pretty worn by now. Is this leading to his compression problems? If not does anyone else have any suggestions, because im out of ideas . Thanks.

Thanks for your input dirtdemon. Me and my buddy have been working on the quad for a few weeks now.. The top end on the wheeler has been torn down twice, and the head taken off about 4 times(not my quad not exactly sure how many) but anyways, the gaskets were never changed. Im thinking this could be leading to his compression problem but im not sure, any ideas?

Hey thanks for your reply yet again. That sounds about right to me, last time all I did was rings and the end ring gap was supposed to be .014 for the first and .024 for the second, I was at .034(somewhere in there) and .040(somewhere in there as well) So im guessing/hoping it will be as simple as going up a bore size on the piston.. Just wanted to say thanks again

Thanks for the reply. Im guessing that the choke is due to lose parts, it felt pretty lose but I couldnt find any screws or anything to tighten, ill take a closer look when I have the wheeler apart. As for the valve guides/valve seals, I did the valves last summer, but ill take another look. My guess for the smoke is that oil is getting past my rings, because my rings were all to big. I think my cylinder is just worn, I think ill have to go up a piston size, maybe to an 86mm bore up from the stock 85. But im not sure, ill check it out. Thanks again for the reply

Just figured Id add that its a year 2000 400ex

Hey, I cant think of any reasons why, but on my 400ex, when I give it alot of gas and shift through the gears(usually when I get into 3rd) my choke comes on and my wheeler bogs out and dies unless I clutch in and turn the choke off. I cant think of why this would do this. It seems like it started somewhat recently. Last summer I put a set of rings and valve guides on the 400ex, but ended up gettings rings a bit to big, and the wheeler continued to smoke, so this spring, im going to tear it back down, anyways I wanted to know if anyone knew why the choke was kicking on? I would like to order all my parts at once and do all the work to the wheeler while im doing the topend this spring.