How to set timing on a 87 Honda TRX250X
Sep 17, 2002 | 10:59 AM
#2
Pro Rider
Joined: Jul 1999
Posts: 219
Likes: 0
gottoride,
First and foremost, do you feel confident to do this job. Take the 2 covers off the sidecase using Allen wrenchs (I forget the size). Then take a 15mm (I believe) socket and turn the crankshaft through the center hole in the side case until you see the line with a "T" in the other hole in the sidecase. That's top dead center. Next, take the valve cover off the top of the head. That should have like 10 8mm bolts. Then you have to take your cam sprocket off the cam shaft using the 2 allen bolts. Keep the sprocket on the shaft so that you can spin the sprocket. Align the cam using the marks provided on both the shaft and the sprocket. put the chain back on the sprocket and bolt it back to the shaft. Put everything back together and give 'er.
~~Team440ex
First and foremost, do you feel confident to do this job. Take the 2 covers off the sidecase using Allen wrenchs (I forget the size). Then take a 15mm (I believe) socket and turn the crankshaft through the center hole in the side case until you see the line with a "T" in the other hole in the sidecase. That's top dead center. Next, take the valve cover off the top of the head. That should have like 10 8mm bolts. Then you have to take your cam sprocket off the cam shaft using the 2 allen bolts. Keep the sprocket on the shaft so that you can spin the sprocket. Align the cam using the marks provided on both the shaft and the sprocket. put the chain back on the sprocket and bolt it back to the shaft. Put everything back together and give 'er.
~~Team440ex
Sep 17, 2002 | 05:18 PM
#3
Pro Rider
Joined: Jan 2001
Posts: 1,850
Likes: 0
Well, those plugs have a slot for a screwdriver. But, he is right about removing them and turning the flywheel. There is about a dozen 6mm bolts with a 10mm head in the rocker cover. There is probably 5 different lengths so make sure they go back in the same hole. There should be three lines on the cam sprocket (held on by two bolts with a 10mm head). With the crank held at TDC, put the sprocket in the chain so that 1 line is straight up and the others are directly across from each other: My attempt at a drawing.
I
_ _
The two lines across from each other need to be lined up with the right side edge of the head where the head and rocker meet. Make sure the front of the timing chain is tight while doing this. Your tensioner will be on the back side. You will need to insert a small flat blade screwdriver into the hole in the back after you remove the bolt with an 8mm? head. You will need to wind the tensioner (it will only go one way) and have someone hold it while you set the timing. After you tighten the sprocket bolts, let the tensioner loose, roll the engine over a couple of times, and make sure the timing is still right.
PM me if you have any questions.
I
_ _
The two lines across from each other need to be lined up with the right side edge of the head where the head and rocker meet. Make sure the front of the timing chain is tight while doing this. Your tensioner will be on the back side. You will need to insert a small flat blade screwdriver into the hole in the back after you remove the bolt with an 8mm? head. You will need to wind the tensioner (it will only go one way) and have someone hold it while you set the timing. After you tighten the sprocket bolts, let the tensioner loose, roll the engine over a couple of times, and make sure the timing is still right.
PM me if you have any questions.
Mar 30, 2020 | 06:02 PM
#4
Weekend Warrior
Joined: Mar 2020
Posts: 1
Likes: 0
Timing Marks
Well, those plugs have a slot for a screwdriver. But, he is right about removing them and turning the flywheel. There is about a dozen 6mm bolts with a 10mm head in the rocker cover. There is probably 5 different lengths so make sure they go back in the same hole. There should be three lines on the cam sprocket (held on by two bolts with a 10mm head). With the crank held at TDC, put the sprocket in the chain so that 1 line is straight up and the others are directly across from each other: My attempt at a drawing.
I
_ _
The two lines across from each other need to be lined up with the right side edge of the head where the head and rocker meet. Make sure the front of the timing chain is tight while doing this. Your tensioner will be on the back side. You will need to insert a small flat blade screwdriver into the hole in the back after you remove the bolt with an 8mm? head. You will need to wind the tensioner (it will only go one way) and have someone hold it while you set the timing. After you tighten the sprocket bolts, let the tensioner loose, roll the engine over a couple of times, and make sure the timing is still right.
PM me if you have any questions.
I
_ _
The two lines across from each other need to be lined up with the right side edge of the head where the head and rocker meet. Make sure the front of the timing chain is tight while doing this. Your tensioner will be on the back side. You will need to insert a small flat blade screwdriver into the hole in the back after you remove the bolt with an 8mm? head. You will need to wind the tensioner (it will only go one way) and have someone hold it while you set the timing. After you tighten the sprocket bolts, let the tensioner loose, roll the engine over a couple of times, and make sure the timing is still right.
PM me if you have any questions.
I'm having trouble finding the "T" marking is this before or after the 3 lines, all i can find are the 3, 2 , and 2 spaced out. Any help?
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)