UK Monster Owners Club Forum » .: Technical :. » Engines, Clutch, Gears » Cam belt one tooth out?

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Old 25-12-2018, 10:14 AM   #16
mickj
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There are a couple of you tube vids you could take a look at to help.
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Old 25-12-2018, 10:16 AM   #17
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It's probably worth just checking to see if you have inadvertently disturbed an electrical connection somewhere... Easily done when you're working on the bike.

Give all the connectors you can find, a good wiggle and push together, especially all the connectors to the coils and injectors ect.
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Old 26-12-2018, 12:49 AM   #18
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If you want to borrow my locking pins, I'd be happy to pop them into a jiffy bag and send them off to you - no charge. Just PM me your address.

Very gracious, thank you.

I purchased some the other week in readiness.

Am I right in thinking though, that if the horizontal cam is at TDC the vertical cylinders locking point will be in the right place?
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Old 26-12-2018, 10:34 AM   #19
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That's it - there's only one point where all three pulleys line up. If it's not in the right position, the locking pins won't locate.

Note that, when it comes to tensioning the belts, you don't need to move the vertical cylinder round to TDC because the locking pin stops the valves' closing springs from affecting the tension.

Have fun!
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Old 27-12-2018, 03:23 PM   #20
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2 hours and the belts are done. I just need to get the tension right and then it will be done. As these are the Exactfit belts it's the sonic tension, struggling to find anything for the phone that's suitable and don't have a microphone for the laptop. It has to be said for 4000 miles the belts definitely looked like they'd seen better days. All in all though, quite a pleasurable little job and more straightforward than I was expecting. Started again first touch. Having beer now...
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Old 27-12-2018, 04:04 PM   #21
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I just need to get the tension right and then it will be done. As these are the Exactfit belts it's the sonic tension, struggling to find anything for the phone that's suitable
Did you try this one? http://www.ukmonster.co.uk/monster/s...ad.php?t=56189

If there's nothing suitable, there's always the tried and tested allen key method.

For what it's worth, I fitted my belts using that method before taking it to Moto Rapido to check the valves. Because the valves needed adjustment, the belts had to come off again anyway and Moto Rapido refitted them, tensioned to 140 Hz. Out if interest, I checked the tension with allen keys and found that a 4mm key was a tight fit on both belts as against the 6mm and 5mm recommended by the allen key method. (The Evo workshop manual gives the same tension for both cylinders).

It seems to me that an exact tension is not that vital since the operating window is pretty wide - 140 Hz when new, 100 Hz for used and no adjustment needed until a used belt drops below 70 Hz.
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Old 27-12-2018, 05:27 PM   #22
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Quote:
Originally Posted by Luddite View Post
Did you try this one? http://www.ukmonster.co.uk/monster/s...ad.php?t=56189

If there's nothing suitable, there's always the tried and tested allen key method.

For what it's worth, I fitted my belts using that method before taking it to Moto Rapido to check the valves. Because the valves needed adjustment, the belts had to come off again anyway and Moto Rapido refitted them, tensioned to 140 Hz. Out if interest, I checked the tension with allen keys and found that a 4mm key was a tight fit on both belts as against the 6mm and 5mm recommended by the allen key method. (The Evo workshop manual gives the same tension for both cylinders).

It seems to me that an exact tension is not that vital since the operating window is pretty wide - 140 Hz when new, 100 Hz for used and no adjustment needed until a used belt drops below 70 Hz.
I'm going off what Chris Kelly from Cycleworks said. 110~99 Hz preferably the latte


Will check that app, thanks. The Gates one is a bit flaky.
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Last edited by Mossleymonster; 27-12-2018 at 05:29 PM..
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Old 29-12-2018, 05:01 PM   #23
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I am all sorted now, just been out for a 45 minute run on the bike and all is good, two things have been learned.

1. The videos etc all miss out one important step.

That is the requirement to hang the big Oxford chain that you use to secure you monster from the rear brake lever (ensure you are still in gear). The effect of this is to prevent the drive pulley from moving out of position whilst you are battling to get the belts on. Once you have used this method you can be sure that you don't finish the job one tooth out like I did twice!

2. Amazon is unfortunately better than your local tool specialists.

I am keen to use local suppliers and shops but when I required a reverse spark plug thread chaser they were all unable to get one until well into the new year. Amazon got hold of a Sealy reverse thread chaser in 48 hours no problem and thus made it possible to get my vertical plug back in. The plug felt like it was trying to cross thread and I was not keen to force it and cause and expensive and or time consuming problem. Th reverse thread chaser cleans our the thread and straightens it all out without the risk of any shavings etc going into the cylinder.

Just need to re-check the belt tension tomorrow and give it a good clean.

Last edited by alickswud; 29-12-2018 at 05:05 PM..
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Old 29-12-2018, 06:30 PM   #24
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That's great news, alick.

I think you should buy a lottery ticket today because you definitely lucked out here! If the cams were inadvertently overly advanced, then the inlet valve might hit the piston as it could reach maximum lift before the piston has dropped far enough to accommodate it. (I don't know if one tooth is enough for that to happen.) If the cams are retarded then the motor will run really roughly, if at all. From what you reported, it sounds like they were retarded and, if so, no damage done.

A result!
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Old 29-12-2018, 07:02 PM   #25
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Yeah, the factory crank turning/holding tool has a locking pin, that screws into one of the inspection cover holes, meaning that isn't a problem.

A tooth or two will be okay without becoming expensive, just runs like a bag of $#!^ as you found out.
Always turn the motor over really gently by hand and check everything's aligned before pressing the button!!

Last edited by slob; 29-12-2018 at 07:09 PM..
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