 Hey guys, welcome to titanium and garage and if you're new to the channel Feel free to subscribe I've got hundreds of videos and hit the bell if you want notifications for my upcoming videos This is my latest project. I've got a 05 Scrambler 500 that's got some Issues going on now. I've been going through this thing and I can get it to run She idles fine she drives up and down good, but they give her the throttle hard It just wants to choke out or if I tow something behind it It just wants to choke out and die first day. I went through the car made sure the car was clean Make sure you didn't have any issues with that and I went ahead and Saw a little black smoke coming out of the tailpipe and it told me a couple things Told me the valves weren't opening correctly Timing was off. So the first thing I did was I pulled the rocker cover off and I want to check the The rocker to valve clearance And as I was taking it apart Notice I had a lot of slop in this chain another thing. I noticed is I've got A little bit of free play going on up here, which is not normal. So that's telling me that the chain stretched The tensioner up here So the tensioner up here is probably maxed out. I'm going to pull that out Yeah, because What it's doing is the engines rotating And this is kind of Sloppy as this is with that much play in it Now the crank isn't turning. It's just the cam turning And as loose as I see this chain is That chain needs to get replaced I need to reset the valves. Let me show you had another engine I got over here almost the same identical engine and There's no free play And this is nice and tight. I think the story on this engine was the Piston seized up. So I'm gonna take the chain off of that and the tensioner and I'm gonna put it on this bad boy Hopefully that'll correct my issues Like I said, it was a blown a little black smoke Which right away was telling me that the the valves were in opening at the correct time Or could be possible valve seals Are leaking. So here's my quick tip of the day So if you got a scrambler or even a sportsman 500 for that matter that's Spit and sputtering backfiring when you give a full throttle Check your timing check your chains. I've shot a couple videos now on how to build players 500 engines and I can't stress enough You know replace that chain the chain stretches, you know, especially this has got I think this has over 4,000 miles on it You know things wear out things things stretch out Put a new chain in that I got one ordered and I'm gonna reset the valves and the timing And hopefully I'll be good to go. All right, also as I'm checking the valve clearance. I got this at top dead center and This is not Going underneath here at all and this is a 0.006 that's what your Your valve clearance is The other side the exhaust side is loose. This is the intake side. That's pretty tight So that would explain why it was probably blowing some black smoke That and the chain slop and when this thing was running I did notice a little chain slop I could hear a little rattling noise in the engine and so that was my first clue That's something that was going on with that chain All right, so I went ahead pulled the stator and what I'm trying to do is I'm trying to line up See the mark there the mark on the gear can't see it because it chains in the way and Two top divots with the mark down here once you get the crank lined up with this mark And I have a video on this and I'll post the link how to do this It's actually pretty simple, you know, it's a lot easier to do any kind of Timing if you want to set your timing by doing it this way Yeah, it's a little messy because you got to pull the stator off But then you know you're exact you get the mark on the case Right here. And there's a mark on the crank. I should say the the gear And your two marks up here So I'm gonna go ahead and replace that chain and then reset my rockers And I should be ready to go So I discovered something new I thought there was slack in the chain and the chain was Stretched but as I am rolling on the cam back and forth watch this little geared on here It moves and the crank stays You see that and I also noticed this nut is loose So What I'm thinking is the key way All right, so if you watch that key way now the nuts move There's slop in that gear in that key way cranks not moving The gear or the sprocket is so I'm gonna take the chain off Loosen that pull that out and see what's going on because that's obviously throwing the timing off and Throwing off the the valves Which is probably why it's blowing a little black smoke. I'm sure Intakes opening before the exhaust should be Something something's not right. So I'm gonna go ahead and take that apart. See if that keyway is warm I'm gonna take the chain tensioner off first then the cam sprocket and I'll go from there looks like that Tensioner is maxed all the way out to percent and I'm gonna go ahead take this off We're dropped on All right, I'm looking at that sprocket Let me see if there's any We're in there and I'm looking at this key way Okay, I just happen to have another sprocket. I'm gonna give that a try Might have to replace that key way Okay, that's got some slop in it You know, we can see that key way that's right here. Oh This is about ready to come out. I'm gonna pull that out and inspect it It's probably worn out so I'm gonna replace it All right, so here's that key way. She's got a nice groove in it Maybe you can see that in the camera See the line going across there. All right, so I just replaced that key way and Show you how she fits now Nice and snug. It's not moving It's gonna pop that in there And put the chain back on All right, so I went ahead and I tighten your up real tight and now I'm in the middle of Setting the timing so there's a timing mark here. It's timing mark on the sprocket There's a silver link on the chain And up on top two marks there Two silver links you line that all up and your timing should be right on and then all you have to do is Adjust the valve lash between the rockers Let me show you. It's nice and tight now. I'm wiggling the cam sprocket and That is not moving. So my guess is this nut came loose the sprocket was moving in and out or the key way and through the timing off so Yeah, and also don't forget to tighten that nut when you put it back on I just move that out of the way to make the chain go in and out easier once they get this bad boy back together So yeah, she runs. All right guys, so I was gonna show you how it fires up and I Started it up and it idled for a couple seconds and then nothing so I've been going through my carbs thinking Okay, maybe I'm getting too much gas. I saw some gas coming out of the carb And I got me thinking. Let me double check the timing. You can see I got the T for top dead center And now that I'm looking at my my cam gear the two divots aren't on the top like it should be So I started pulling the flywheel off Let me show you what I found here I already pulled the bolt Get you in the light here. I had sheared the key way off Just keep that in mind too if you're having issues with with the nut starting my key way is actually on the bottom That through the timing completely off. So here I thought Here was cleaning the carb trying to go through everything. I thought well let me double check my timing because After two or three revolutions the chain will make the tensioner move a little bit and Just want to double check your valve lash after that the chain will tighten up So yeah, yeah, here. I'm trying to fire it up and run for a couple seconds and die So keep that in mind That could be one of your issues, you know, you share the key way off Your timing is gonna be completely off There's a This little part right here I want to engage with that that's your pulse coil that tells your spark plug went on fire So if you're if your key way sheared off and your flywheels off and it'll spark at the wrong time How I figure it out was I saw gas shooting out of the carb so that meant the Exhaust valve was opening on the intake stroke Blowing fuel back out the car Thought I'd show you that quick little tip keep that in mind if you're having issues with it not starting There you have it hard to get a good shot, but you can see the white little dot through the Pull start cover That's the tee telling you you are at top dead center my two little dimples on the cam gear on the right spot So I just got a tighten everything down. I'm gonna double-check the valve last That should be good to go. So what would cause your key way to shear off like that? one thing I can think of right now is I was a messing around with my carburetors and I grabbed An aftermarket carburetor and I put it on Yeah, once I went to fire it up. I noticed it was leaking gas out of the bottom So I'm thinking fuel got into the cylinder and hydro locked it So, you know, obviously it's not gonna spark pistons pushing up push compresses all the fluid inside and At the same time while you're starting it would shear off the key way for the flywheel Make sure I drain a case make sure there's no field on dawn at the bottom. I'm gonna try firing it up With the spark plug out to make sure there's no more gas in the cylinder And go from there. Hopefully I can get this bad boy fired up They show you what this bad boy can do