Date: 29-03-24  Time: 01:41 am

Author Topic: Refitting the timing chain...  (Read 12934 times)

anutz

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Re: Refitting the timing chain...
« Reply #25 on: 25 April 2015, 03:46:14 pm »
thanks red98 - measuring clearances now....

Unfazed - yep, its good now, until that penny dropped I was fighting a losing battle - but I got there!

Before I start taking anything apart again I am going to Tipex the sprocket and chain for future reference...

Unless anyone has any alternatives...


Jules-C

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Re: Refitting the timing chain...
« Reply #26 on: 25 April 2015, 08:24:50 pm »
Have to check the number of teeth on the sprocket and links on the chain there's no guarantee a chain link will match up to the same tooth every time it comes round

anutz

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Re: Refitting the timing chain...
« Reply #27 on: 25 April 2015, 10:22:50 pm »
Ok so have done the clearances.....


And managed to get the chain and cams spot on again..


Here is what i did


Found TDC


Held Exhaust Side of Timing chain taught ( not silly but firmly )


Located Exhaust Cam and varied the sprocket mating position to chain until there was as good alignment as possible with the caps ( was not 100% )


Located Intake Cam and aligned as best as possible


Secured Caps with Bolts, ensuring to be aware of tightening on to Opened Valves before Closed and following a criss cross pattern


Used a Socket on the Flywheel to turn it clockwise a little whilst making sure chain does not jump off the Exhaust Sprocket, this took up any slack in between the sprockets


Installed the tensioner taking up slack in the intake side of the chain


Installed the top side chain guide/guard ( required 4 center bolts losening but no issues there )

Took opportunity to check the Cylinder Head Bolt torque before i put cams in as well as i have put the head back on


I have done this twice now and its worked fine each time - past week i have been using all sorts of methods and too focused on lining them up perfect not taking into account the effect of the slack and the effect of cranking clockwise slightly to take it up and move it to the Intake side for the tensioner to deal with...


Any observations fine, but it worked for me!


Thanks for previous posters input as well it all alluded to the fact it was not as simply as line them up and tighten down


 :)



Paulfzs

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Re: Refitting the timing chain...
« Reply #28 on: 25 April 2015, 11:00:32 pm »
so is it back together and rideable yet :D :D :D

anutz

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Re: Refitting the timing chain...
« Reply #29 on: 25 April 2015, 11:05:18 pm »

not yet  :b


But i think i will be there by this time next week!


Fair bit still to do but not nearly 1/2 a tricky or time consuming


last tricky thing is the sprocket nut change i plan to do tommorow then the rest is just putting it all back where it belongs...










Paulfzs

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Re: Refitting the timing chain...
« Reply #30 on: 25 April 2015, 11:24:13 pm »
drink lots of orange juice wash it down with milk, trick i used at school to get the day off, then phone in work say youre sick then you can finish it off!

anutz

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Re: Refitting the timing chain...
« Reply #31 on: 26 April 2015, 07:42:01 am »
what if I throw up all over the bike?!

 :rollin

Paulfzs

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Re: Refitting the timing chain...
« Reply #32 on: 26 April 2015, 12:29:48 pm »
what if I throw up all over the bike?!

 :rollin


Excuse to take it for a ride to wash it when youre done

anutz

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Re: Refitting the timing chain...
« Reply #33 on: 26 April 2015, 01:04:45 pm »
Well engines back together anyway and just battling like crazy with the carbs - saw your article on engine change and finding something to lever them in with!

red98

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Re: Refitting the timing chain...
« Reply #34 on: 26 April 2015, 01:52:44 pm »
Take it the clearences were all OK........yep, carbs can be a bit of a pain, I've tried it always and still dont know whats best  :\.....last time I fitted carbs to air box first, securing with the clips as they do slip out easy, then offer the carbs and air box upto the inlet rubbers.....oh, dont forget to connect the throttle cables first  ;)
One, is never going to be enough.....

anutz

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Re: Refitting the timing chain...
« Reply #35 on: 26 April 2015, 01:56:59 pm »
Hi red98...

Clearances were appalling....

Some were 0.06 an others were 0.35...

Reason being that the whole cylinder head was turned upside down by someone who shall remain nameless!!!

So it was a random put back together and then measure and adjust as needed

Ended up changing 9 shims, had a box of about 30 so was fine...and could re-use some that I took out

One or 2 were on the limit i.e 29 and 19 etc... but I am ok with that for now - once it turns over and runs I can always go back to it and adjust

Throttle cables are in and going to try fitting the carbs again now...




red98

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Re: Refitting the timing chain...
« Reply #36 on: 26 April 2015, 02:28:35 pm »
Wow,9 replaced , thats a lot ......going to be one well sorted fazer when your finished   :thumbup......just to keep you busy, you going to balance the carbs when its all back together again and running ?
One, is never going to be enough.....

anutz

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Re: Refitting the timing chain...
« Reply #37 on: 26 April 2015, 02:36:12 pm »
yep - I have a carb sync tool - it was one of the first things I did a few weeks after getting it....at least now I have no question in my mind where the correct screws are....and im not scared of the bike and un-doing things any more lol

Have the carbs on now - used a bar as a lever on the back of the airbox, with some WD40 around the seals - popped in nicely

I did actually leave the jubilee clips in different angles to where they were - easier access to the hex bolts if I need it again in the future....


red98

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Re: Refitting the timing chain...
« Reply #38 on: 26 April 2015, 05:08:56 pm »
Nice one  :thumbup........just a few bits and bobs and your ready to hit the start button........ :)
One, is never going to be enough.....

unfazed

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Re: Refitting the timing chain...
« Reply #39 on: 26 April 2015, 06:26:55 pm »
When all is back together, do a quick recheck.
All bolts tightened, throttle adjusted and checked lock to lock, all connection connected, fuel tap turned on, plug caps in the right position. :)
Turn on the ignition with the kill switch on run, wait until the pump stops ticking, switch of the ignition, switch it on again, wait until the pump stops ticking, keep doing this until the pumps stops, then the float bowls are full. :thumbup
Now hit the starter button. :woot

Paulfzs

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Re: Refitting the timing chain...
« Reply #40 on: 26 April 2015, 06:45:41 pm »
yeah the carbs where a pain!!!


getting the carbs in took some pushing and loads of lube once they where mostly in i pushed the airbox in as best i could then just got the jack handle in the airbox gaps which look made for this task and gave em a good shove, popped in eventually then done up the jubilee clips.

anutz

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Re: Refitting the timing chain...
« Reply #41 on: 26 April 2015, 08:23:52 pm »
Its done!

It runs nice - I think - just loading a video now!

Have not done the sprocket etc but the engine works

Whooooo!

Have not tightened down the downpipes yet or the link pipe so a little crackle some times

But its past the first test, radiator warmed up as well so no issue with air locks, and no leaks


unfazed

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Re: Refitting the timing chain...
« Reply #42 on: 26 April 2015, 08:51:03 pm »
Well done, :thumbup
Remove the filler cap and recheck the coolant level when cold.

red98

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Re: Refitting the timing chain...
« Reply #43 on: 26 April 2015, 08:53:06 pm »
 :thumbup :thumbup :thumbup :thumbup :thumbup
One, is never going to be enough.....

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Re: Refitting the timing chain...
« Reply #44 on: 26 April 2015, 08:55:51 pm »
Anyone know of a possible timing mod
Reason being I decided to balance my carbs, thought it best to check valve clearance first
They were spot on.

When I turned the engine for #1 tdc noticed my exhaust cam was not aligned with the cam mark but was in the
One o'clock position
My engine sounds right runs good and valve clearances correct so decided not to worry about it
But it's bugging me so the only conclusion I can think of is that the previous owner had intentionally set it like this as a power mod ?

anutz

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Re: Refitting the timing chain...
« Reply #45 on: 26 April 2015, 08:56:37 pm »
Here is the video of it!


anutz

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Re: Refitting the timing chain...
« Reply #46 on: 26 April 2015, 09:00:56 pm »
regards the cams being out - maybe they just settled for it as it was, I don't know if it would be a mod....but durations of open/close will affect running..

As many said on my pictures I was a sprocket out, it took a long time to figure out how to take up the slack with a sprocket and small clockwise turn - have done it 2 times now as I had to do valve clearances...

If its working fine then you may be best to leave it - but if you a like me then you might not be able to resist

Put some marks on it now so u can see which chain link matches with which sprocket tooth

I did not do that and it has taken me ages - but the 2nd time was quicker as they gave me a good guide to where I needed to be

unfazed

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Re: Refitting the timing chain...
« Reply #47 on: 26 April 2015, 10:21:03 pm »
Anyone know of a possible timing mod
Reason being I decided to balance my carbs, thought it best to check valve clearance first
They were spot on.

When I turned the engine for #1 tdc noticed my exhaust cam was not aligned with the cam mark but was in the
One o'clock position
My engine sounds right runs good and valve clearances correct so decided not to worry about it
But it's bugging me so the only conclusion I can think of is that the previous owner had intentionally set it like this as a power mod ?

No power mod, it is a tooth out.
 I have seen it before where the owner thought it was close enough, he did not realise it was a tooth out. Engine were running fine before and when we fixed it he did not notice any difference.

Before I changed my cam chain it was over a tooth out because the chain had stretched so much, it was running fine except for the rattle and to be honest I did not notice any difference either.

Tommyk

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Re: Refitting the timing chain...
« Reply #48 on: 27 April 2015, 01:44:57 pm »
Ok thought it might be a clever timing/extra power mod but if nobody else has heard of it
Then I'm definitely gonna reset it to correct timing as I can't accept it not being incorrect

Takes a few turns to start from cold hence the valve clearance and carb balance check
Hopefully this will solve the cold start riddle as runs perfect when up to temp

anutz

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Re: Refitting the timing chain...
« Reply #49 on: 27 April 2015, 01:52:44 pm »
Good luck!

Remember mark it first - I used Tipex

 :lol