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How do i set the balance shaft correctly (Aprilia RS125)

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leepick
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Joined: 24 Jun 2011
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PostPosted: 18:00 - 25 Jun 2011    Post subject: How do i set the balance shaft correctly (Aprilia RS125) Reply with quote
hi all. basically i need to no if theres a right or wrong way of putting the balance shaft (balancer) into the engine as ive just done a rebuild and put the engine back in my bike and the bike was shaking quite a bit when running so ive took the engine back out to check everything tighten everything and just generally go over everything so i can get her running smoothly again.

really need help with this so any advice will be very appreciated.

thanks in advance... lee
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leepick
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PostPosted: 19:03 - 25 Jun 2011    Post subject: Reply with quote
just to update. ive just started to work on the engine and the piston head has been battered by something up the one side and the rings have been beaten up a touch... any ideas?
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MaybeGuy
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PostPosted: 19:05 - 25 Jun 2011    Post subject: Reply with quote
power valve set badly/failed.
pretty common on them apparantly
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Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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leepick
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PostPosted: 19:24 - 25 Jun 2011    Post subject: Reply with quote
mattsprattuk wrote:
power valve set badly/failed.
pretty common on them apparantly


really you think?.

can i have put the wrong size piston in? like too big for example. because getting the piston in the barrel when we put the engine back together was a bit of a task. when it should just slot straight in right?
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leepick
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PostPosted: 19:30 - 25 Jun 2011    Post subject: Reply with quote
oh and is it possible to put the piston on the wrong way?
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Martay
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PostPosted: 21:19 - 25 Jun 2011    Post subject: Reply with quote
leepick wrote:
oh and is it possible to put the piston on the wrong way?


Yes, theres either an arrow (points the way of gas flow) or and E for exhaust i believe.
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leepick
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PostPosted: 21:26 - 25 Jun 2011    Post subject: Reply with quote
the arrow on mine is facing the back of the bike? is that right or should it be facing the start of the exhaust at the front of the bike? i hope i havent put it on the wrong way lol... please reply
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leepick
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PostPosted: 21:31 - 25 Jun 2011    Post subject: Reply with quote
can the power valve be put on wrong aswell? like facing up or downwards
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P.
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PostPosted: 21:43 - 25 Jun 2011    Post subject: Reply with quote
Arrow should face exhaust.... lol

Power valve... mine wasnt set correctly, Thats why it was pulled out all the way... Can slide in the port and scrape the piston.
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leepick
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PostPosted: 21:53 - 25 Jun 2011    Post subject: Reply with quote
##Paddy## wrote:
Arrow should face exhaust.... lol

Power valve... mine wasnt set correctly, Thats why it was pulled out all the way... Can slide in the port and scrape the piston.


lol should the arrow point to the back of the bike or the front of the bike? and i dont think my valve was in correct cos my piston has been mashed up... do you no the correct way the valve should go in?..

also shall i get a standard size piston again?
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P.
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PostPosted: 21:57 - 25 Jun 2011    Post subject: Reply with quote
Mate... get someone to rebuild it for you..

Following the instructions..not trying to sound harsh.. would have told you exactly how to rebuild it.
Arrow points to the front. You could have damaged your barrel, if so thats another barrel needed.

Take the top end off, check it all.
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tatters
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PostPosted: 22:03 - 25 Jun 2011    Post subject: Reply with quote
The balancer shaft/weight does have to be in the correct postion when installed as it needed to counter act the movement of the crank to reduce the vibrations, installing the balancer incorrectly will casue very bad vibrations.

There should be timing marks on the balancer shaft and weight for when the crank is in the top dead center postion.
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leepick
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PostPosted: 22:13 - 25 Jun 2011    Post subject: Reply with quote
[quote="##Paddy##"]Mate... get someone to rebuild it for you..

Following the instructions..not trying to sound harsh.. would have told you exactly how to rebuild it.
Arrow points to the front. You could have damaged your barrel, if so thats another barrel needed.

Take the top end off, check it all.[/quote

not harsh at all boss im on here for peoples advice and help so its all good i appreciate the help..

i had the arrow facing the back of the bike (obviously thats wrong) but i now no the new piston must face the front.

ive checked the barrell its fine (luckily enough)

is there a right and wrong way as to putting the valve in? if so could you tell me which way?..

thanks again.
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leepick
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PostPosted: 22:16 - 25 Jun 2011    Post subject: Reply with quote
tatters wrote:
The balancer shaft/weight does have to be in the correct postion when installed as it needed to counter act the movement of the crank to reduce the vibrations, installing the balancer incorrectly will casue very bad vibrations.

There should be timing marks on the balancer shaft and weight for when the crank is in the top dead center postion.


mate honestly i dont get how the balance shaft can be in the correct position,. it only goes in one way??...

can you click this link https://www.andysmotorcycles.com/index.php?main_page=product_info&cPath=2_27_170&products_id=201 and tell me if this is what were on about? because i thought it was something else like a prat
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leepick
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PostPosted: 22:20 - 25 Jun 2011    Post subject: Reply with quote
https://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290303891327 << this is the balance shaft i mean.. sorry
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P.
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PostPosted: 22:33 - 25 Jun 2011    Post subject: Reply with quote
leepick wrote:
https://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290303891327 << this is the balance shaft i mean.. sorry


Yea, it goes in one way... but you have to set the entire thing up.. you cant just slot it in any way that fits Laughing
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leepick
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PostPosted: 22:45 - 25 Jun 2011    Post subject: Reply with quote
##Paddy## wrote:
leepick wrote:
https://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290303891327 << this is the balance shaft i mean.. sorry


Yea, it goes in one way... but you have to set the entire thing up.. you cant just slot it in any way that fits Laughing


lol. can you give me some idea as to how then please so i can get it done. or can u post me a video to watch etc
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P.
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PostPosted: 22:47 - 25 Jun 2011    Post subject: Reply with quote
leepick wrote:
lol. can you give me some idea as to how then please so i can get it done. or can u post me a video to watch etc


I was looking for videos, but I couldn't really see any.

Drop Kickstart a pm? he is RS God Laughing
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leepick
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PostPosted: 22:59 - 25 Jun 2011    Post subject: Reply with quote
##Paddy## wrote:
leepick wrote:
lol. can you give me some idea as to how then please so i can get it done. or can u post me a video to watch etc


I was looking for videos, but I couldn't really see any.

Drop Kickstart a pm? he is RS God Laughing


ive seen him loads of times on here answering questions, i sent him a message but no reply... a video is needed or someone who can tell me how to set it... i no how to put the piston on now and which way it goes on... just need to no how to set the balance shaft. and maybe the power valve
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P.
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PostPosted: 23:00 - 25 Jun 2011    Post subject: Reply with quote
Give him time, he's usually busy playing in 2 stroke oil Laughing
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leepick
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PostPosted: 23:15 - 25 Jun 2011    Post subject: Reply with quote
##Paddy## wrote:
Give him time, he's usually busy playing in 2 stroke oil Laughing


lol so you have no idea how to set the balance shaft?
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leepick
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PostPosted: 23:59 - 25 Jun 2011    Post subject: Reply with quote
i no how to do everything now. done some research online. if indoubt ask google lol... thanks for all your help. much appreciated
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kal9001
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Joined: 14 Aug 2005
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PostPosted: 10:38 - 26 Jun 2011    Post subject: Reply with quote
leepick wrote:
##Paddy## wrote:
Arrow should face exhaust.... lol

Power valve... mine wasnt set correctly, Thats why it was pulled out all the way... Can slide in the port and scrape the piston.


lol should the arrow point to the back of the bike or the front of the bike? and i dont think my valve was in correct cos my piston has been mashed up... do you no the correct way the valve should go in?..

also shall i get a standard size piston again?


The answer given is quite simple there. The arrow should point towards the exhaust, How can you manage to rebuild the whole engine and not be able to see where the exhaust port is?

As for putting stuff in backwards, upside down and back to front. As most blokes, Myself included, dont read instructions first. we just like to dive in. So my suggestion is that you may more attention to which way stuff is before you take it out.

No offence intended. it sounds to me like you just ripped it apart and paid little attention to where stuff went then have just tried to mash it all back in where it seems to fit.
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Pete.
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PostPosted: 15:04 - 26 Jun 2011    Post subject: Reply with quote
leepick wrote:
mate honestly i dont get how the balance shaft can be in the correct position,. it only goes in one way??...


There are three marks you need to line up. All are marked here as '4'. You line up the marks on the gear to the one on the shaft, then line the two gears together by using the marks on the edge of each.
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