View previous topic :: View next topic |
Author |
Message |
little.jag troop
Joined: 25 Jun 2008 Posts: 27
|
Posted: Thu Jun 26, 2008 4:53 pm Post subject: what are the tappets |
|
|
what are the tappets? is it a had job to check/adjust
how often should you do it?
and what happens if you dont bother |
|
Back to top |
|
|
CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
|
Posted: Thu Jun 26, 2008 8:24 pm Post subject: |
|
|
Tappets are the valve clearances, should be done regularly as it provides the working clearance needed between the valve and cam to allow for expansion of the metal when it gets hot...
... failure to do them regularly can cause massive amounts of damage.
They take no longer than an hour to do, and dont require special tools apart from some feeler gauges |
|
Back to top |
|
|
richieboy Sargeant
Joined: 21 Jun 2007 Posts: 76 Location: Dumbarton
|
Posted: Fri Jun 27, 2008 9:57 am Post subject: |
|
|
surely this should be done during servicing by dealer?? _________________ C'mon the Hoops! |
|
Back to top |
|
|
CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
|
Posted: Fri Jun 27, 2008 2:37 pm Post subject: |
|
|
Yes it most definately should |
|
Back to top |
|
|
Rhoodman Inspector
Joined: 16 May 2007 Posts: 151 Location: Oakham, Rutland
|
Posted: Fri Jun 27, 2008 4:07 pm Post subject: |
|
|
richieboy wrote: | surely this should be done during servicing by dealer?? |
Yeah, it should be. Ask for it to be done. I asked one Derbyshire dealer to do it, only to be told, "We don't do those unless there are running problems."
I promptly left, and took it to somewhere who knew what they were doing! _________________
|
|
Back to top |
|
|
little.jag troop
Joined: 25 Jun 2008 Posts: 27
|
Posted: Fri Jun 27, 2008 4:47 pm Post subject: |
|
|
mine hasnt been serviced for 7000 kms. i have changed oil oil filter air filter, belt rollers, but not adjusted the valves.
so how often should they be done?
can they cuase the scooter to run slowly until warmed up? |
|
Back to top |
|
|
suit scoot Inspector
Joined: 17 May 2007 Posts: 451 Location: Costa del Redcar.
|
Posted: Fri Jun 27, 2008 10:25 pm Post subject: |
|
|
Rhoodman wrote: | richieboy wrote: | surely this should be done during servicing by dealer?? |
Yeah, it should be. Ask for it to be done. I asked one Derbyshire dealer to do it, only to be told, "We don't do those unless there are running problems."
I promptly left, and took it to somewhere who knew what they were doing! |
what he really meant was, "we dont do those until it pops a valve and it destroys your whole top end the day after the warranty runs out so you can bring it to us and spend your life savings on your shopping bike...."
_________________ revolution deathsquad! |
|
Back to top |
|
|
CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
|
Posted: Sat Jun 28, 2008 9:02 am Post subject: |
|
|
When you do them depends on the engine...
The GT125/200 models have a 6000km service interval, and need valves done at 6000km then every 18,000km after that....
The GTS250/300 models have a 10,000km service interval, and need valves done every 20,000km.... |
|
Back to top |
|
|
little.jag troop
Joined: 25 Jun 2008 Posts: 27
|
Posted: Sat Jun 28, 2008 9:45 am Post subject: |
|
|
so in theory mine dont need doing yet.
its just that i read some tech tips on the internet taht says poor accleration when engine is cold is because tappets maybe too tight and need adjusting...............is this correct because my scooter has this symptom.
infact even on a sunny morning i need to go awhile before it will egt past 40. when the engine does get hot then its ok
what does anyone think? |
|
Back to top |
|
|
CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
|
Posted: Sat Jun 28, 2008 9:48 am Post subject: |
|
|
For how long it takes i would check them |
|
Back to top |
|
|
Blackpool Paul Guvernor
Joined: 28 May 2007 Posts: 531 Location: Blackpool
|
Posted: Sat Jun 28, 2008 12:32 pm Post subject: |
|
|
Cheeky knows his stuff, no doubt about it, take heed, but would it be worth trying some Redex type addative to the petrol too? _________________ GTS250 its the future!!! A club wi owt a name sc. Bamberbridge. |
|
Back to top |
|
|
little.jag troop
Joined: 25 Jun 2008 Posts: 27
|
Posted: Sat Jun 28, 2008 12:47 pm Post subject: |
|
|
whats redex additive? and what will it do?
anyway have decided to book it in at a piaggio dealer for the first check/adjust. |
|
Back to top |
|
|
Blackpool Paul Guvernor
Joined: 28 May 2007 Posts: 531 Location: Blackpool
|
Posted: Sat Jun 28, 2008 12:55 pm Post subject: |
|
|
Redex has been out for donkeys years, it now comes in a few different types, basically its upper cylinder lubricant, ie it lubricates valves, a bit like 2 stroke oil does for 2 stroke engines, yes I know 2 strokes dont have valves, but you mix it in the recommended doseage in the petrol, it also helps keep the injectors clean and reduce shit build up in the cylinder, if you beleive all the claims they make, but for a couple of quid try it? _________________ GTS250 its the future!!! A club wi owt a name sc. Bamberbridge. |
|
Back to top |
|
|
little.jag troop
Joined: 25 Jun 2008 Posts: 27
|
Posted: Sat Jun 28, 2008 4:23 pm Post subject: |
|
|
ok will give it a go, i dont think i have injectors but i do have a carb. |
|
Back to top |
|
|
Mr vespa
Joined: 20 Jun 2008 Posts: 15 Location: cambridge
|
Posted: Sat Jun 28, 2008 10:50 pm Post subject: tappets |
|
|
tappets open and close the inlet and ehaust valves within the head.They are driven by the camshaft.Too large a gap between tappet and cam equals noise and possible power loss .Too tight is the real danger as when the engine heats up the valves may not fully shut due too insuficient tollerance.This can lead to them being burnt out resulting in compression loss and lack of power.Then you would need new valves and possibly valve seats.Check the gap! _________________ Mr Vespa-cool as ice. |
|
Back to top |
|
|
|