Can a motorcycle cam chain be installed without seperating the crankcase.its a 1983 v45 interceptor rear camshaft chain.

Your rear wheel is mounted on an offset cam. Part #6http://www.bikebandit.com/houseofmotorcycles/2004-honda-vfr800-interceptor-interceptor-abs/o/m2792#sch303670 Loosen the bolt on the back of the wheel/cam/bearing holder at the back of the swing arm.Part #16 http://www.bikebandit.com/houseofmotorcycles/2004-honda-vfr800-interceptor-interceptor-abs/o/m2792#sch303667 Use tools Part # 15 and 7or 6 (whichever fits the circumference of the cam) together to rotate the bearing cam until the chain has approximately 1 and 1/2 inches of slack from the top to the bottom of its movement in the middle of the chain slack. Then retighten the bolt on the back of the swing arm. Happy Riding

Center stand your motorcycle. If you have an Interceptor have a friend hold the bike upright. Unscrew the dipstick on the back of the right engine cover. Part #4. http://www.bikebandit.com/houseofmotorcycles/1983-honda-vf750c-magna/o/m11968#sch558483 Wipe off the dip stick and place it back into the opening but do not screw it in. Pull the dip stick out and make sure the oil level is between the high and low mark. If the level is low add only JASO MA certified motorcycle oil designed to work in engines with transmission gears and wet clutches.

Lose chain tidy it up if noise continue it's time for new chain

Yes, that would sound about rite the xl125 r along with all the single hondas are pron to chain noise, easy fix, remove alternator l/ h cover, also timeing cover on cylinder head, mark plate and case with screwdriver for exact replacment, undo 10 mm bolt in end of camshaft and remove the atu unit take care not to loose the locating pin from the camshaft
Remove the pin if loose, undo the 2cover bolts and remove the cam cover, locate the timeing mark on the cam wheel and turn the engine until the mark on the wheel aligns with the mark on the case at about 12 oclock, then check the position of the lower pully and mark this, undo the top wheel bolts securing it to the camshaft, gently pull the wheel of the cam slightly and then hook the chain off the wheel, the cam wheel will now pass through the case opening,the cam chain will now come off the lower wheel, and can be pulled up and out over the end of the camshaft, and replacment would be in reverse order, checking alignment of all previously noted marks and security of all fixings before rotating the engine with a spanner and check it completes a full 360 degres before atempting to use the kickstart, the tensioner is addjusted by removing the top nut from the tensioner located on top of the crankcase lh side at the rear of the cylinder, then undo the 14 mm tensioner bolt, you could try first off screwing a 4mm screw into the tensioner, where the 10 mm bolt is removed, undoing the 14mm and pulling up on the screw with a pliers while tightening the 14mm locking device, as the tensioner is automatic this would be a manual addjustment and may remove the exsess slack

You will need a maintenance manual for this full proceedure or visit the site www.ex-500.com and read articles on this. It is too complicated to explain without pictures and in this small space. Basically it involves removing the cam chain tensioner, setting the camshafts and crankshaft on the appropriate marks. Reset the cam chain tensioner and reinstall.

If you need to remove the cylinder head, here's how. To remove the cam chain, you've got to also remove the left crankcase cover and flywheel.

First, you need to turn the engine over until the piston is at top dead center (TDC) of the compression stroke. Begin by removing the two round covers from the left side of the crankcase cover. Also remove the four tappet hole covers from the cylinder head cover. Turn the engine (in the normal direction of rotation) and watch the intake valves open - and close, then see that the exhaust valves open, then close. Now align the 'T' on the flywheel with the notch in the inspection hole. With all of the valves closed, the engine is at TDC of the compression stroke. Do not begin removal of the cylinder head cover until this is done - to avoid damage to the cover.

With the cylinder head cover removed, you will find two bolts attaching the cam chain sprocket to the camshaft. Turn the engine until you can get a 10mm socet onto the heads of the bolts and remove them. The sprocket will come loose and slide down onto the camshaft, enabling you to remove it an the camshaft.

Upon reassembly, set the cam timing by first setting the engine at TDC. Then, align the two marks on the cam sprocket with the gasket surface on the cylinder head. With the engine at TDC and the marks lined up, the cam timing is properly set.

There should be:
1 mark on the flywheel with a "T" mark which indicates the Top Dead Center of the piston's position.You must turn it to match the mark on the crankcase (a carved line usually).
1 mark on the camshaft's sprocket and a line carved near there on the head.At this structure manufacturers differ from each other.But if you look hard to figure out how it works I sure that you will see it.
You must push the camshaft's chain when you align the marks like when the tensioner will after you put it on.Use a screwdriver through the tensioner's hole.
When you are done the marks on the cam and the flywheel should align straight with their pairs on the case.
Hope I helped a bit.

the only thing you can do is take it all apart there is no simpler way :( sorry

Set the crankshaft's T mark right across the mark on the crankcases and place the cam shafts with their marks looking outwards (I think). Inlet camshaft's IN mark should look towards the rear of the bike and exhaust camshaft's EX mark should look towards the front wheel.After placing the chain (not the tensioner) push it from the tensioner's hole with a screw driver to check if the marks are in line with the cylinder's head surface.Bolt down the camshafts to the specific torque.Then put the chain tensioner.