Ricky9688

Hi im new so hello, I just had to break down the top end of my 85 rebel 250 and im having trouble getting it back in correct time cananyone help me or direct me to an online manual or something thank you

__________________

J-Adix

If I'm not mistaken you actually can't adjust the timing on these rebels. The best you can do is adjust the valve clearance. These rebels use a Capacitor Discharge Ignition (CDI) system, with a Pulse Generator. This system causes both plugs to fire at the same time even though only one piston is a top dead center. You can check to see if your timing is off, but there is no way to adjust it. If it's off you have to check and replace one or both units. It's all in my Clymer.

__________________
1985 Rebel CMX250C Bobber, The Fenderless Wonder!

1974 CB750K (Cafe Racer project under construction)

Ricky9688

well i just need to put it back where it was originally, my top end is broke down i just wanta pt it back together right

__________________

Buickguy

Doing a forum searh for valve clearance will get you this thread FAQ: Valve Adjustment
From the pic there, You can put the timing marks in the right place.
Be sure to have the pistons down before bringing the cam into position so that you don't bend a valve. Line up the timing marks like for a valve clearance adjust. Of course, you will also have to set the valve clearance anyway.
Zeprider also has an excellent video on setting valve clearance that shows how the timing marks need to be set for clearance adjust.

__________________

1987 CMX250C Rebel

2002 FSC600 SilverWing

1983 Yamaha Midnight Virago XV920MK

Put your bike's year and size in your signature.
It helps others help you.

Blueberry

Remember, the cam turns 1/2 the speed of the crank. If you lined up your marks and it still won't start remove the cam chain and spin the cam 360 degrees, put your chain back on. I have never had the head off a Rebel so I can't give you a step by step how to. Get a manual or find it on line. I do not know if the Rebels piston will hit the valves or not if its 360 out of time, so its best to get a manual.

__________________
Ride Safe, Blueberry
1985 Honda 250 Rebel
1970 Honda SL 90
2008 Royal Enfield Electra 500

Fridgitator

If I'm reading this right, you had the timing chain off, and need to know how to line everything up to put it back on?

__________________
'09 Rebel 250

Loud ties save lives.

cagie

wouldn't that be 180 degrees?

__________________
Comments contained in my posts are not intended to cause physical or psychological stress and are mearly my two cents worth, and in this economy, that's cheap!
87 CMX250C 'the Pygmy Pony'
87 CMX450C 'Black Lithium'

Blueberry

Don't know for sure Cagie. I can be wrong, just ask my wife. If it is off 360 its 1 full revolution out of time. If the cam turns 1/2 the speed of the crank it would have to be on the mark every 360 degrees when the crank hits its mark every 720 degrees. I had a 1980 Chevy Chevette. Every 30,000 miles the cam belt went. The easy way was a 30 min. job. If it didn't start spin the cam 1 full rotation and it started. It was not a zero clearance engine so I didn't worry about valves hitting pistons. At 180 off will the timing marks line up or do you need a full revolution (360) for it to line up?

__________________
Ride Safe, Blueberry
1985 Honda 250 Rebel
1970 Honda SL 90
2008 Royal Enfield Electra 500

shadetree

Turn crank 180, leave cam alone. This will put them back in sinc.

__________________

Blueberry

180 is 1/2 a revolution. Will the timing marks line up every 720?

__________________
Ride Safe, Blueberry
1985 Honda 250 Rebel
1970 Honda SL 90
2008 Royal Enfield Electra 500