GTS OWNERS CLUB

little.jag · troop Joined: 25 Jun 2008 Posts: 27

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

CheekyThomas · Guvernor Joined: 18 May 2007 Posts: 1374

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 Very Happy

richieboy · Sargeant Joined: 21 Jun 2007 Posts: 76 Location: Dumbarton

surely this should be done during servicing by dealer??
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C'mon the Hoops!

CheekyThomas · Guvernor Joined: 18 May 2007 Posts: 1374

Yes it most definately should Wink

Rhoodman · Posted: Fri Jun 27, 2008 4:07 pm Post subject:

little.jag · troop Joined: 25 Jun 2008 Posts: 27

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?

suit scoot · Posted: Fri Jun 27, 2008 10:25 pm Post subject:

CheekyThomas · Guvernor Joined: 18 May 2007 Posts: 1374

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....

little.jag · troop Joined: 25 Jun 2008 Posts: 27

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?

CheekyThomas · Guvernor Joined: 18 May 2007 Posts: 1374

For how long it takes i would check them Wink

Blackpool Paul · 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?
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GTS250 its the future!!! A club wi owt a name sc. Bamberbridge.

little.jag · troop Joined: 25 Jun 2008 Posts: 27

whats redex additive? and what will it do?
anyway have decided to book it in at a piaggio dealer for the first check/adjust.

Blackpool Paul · 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?
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GTS250 its the future!!! A club wi owt a name sc. Bamberbridge.

little.jag · troop Joined: 25 Jun 2008 Posts: 27

ok will give it a go, i dont think i have injectors but i do have a carb.

Mr vespa · Joined: 20 Jun 2008 Posts: 15 Location: cambridge

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!
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Mr Vespa-cool as ice.