rather technical about trials bike

[jaylo264]

my 10 y. o. lad wants a trials bike instead of his PY 80, so went to look at a TY80 today ; definite rattle from somewhere engine wise , seller tells me "it's the cooling fins , they always rattle , you've never heard it afor cos both your bikes are watercooled ".
?

Never heard this before , has anyone ?
jaylo

[Steve T]

I take it is a 2 stroke? could be the reed valve, sounds like a rattle in a good way if that makes sense, it is on the inlet side of carb, when worn they can vibrate. To get over that, performace reed valves would help. I did this on a DT175 some years back and cured the problem / made it sound better


Just found this http://www.tytrials.co.uk/trailandtrial ... ntake.html" onclick="window.open(this.href);return false;
Steve

[Rozzo]

the fins do ping & vibrate and watercooleds mask the combustion noise better.

[SplendiferousII]

NoTY80's dont rattle. But even if it does and the price is right they are simple enough to sort out.

My first Trials bike was a TY125 (yep not a 175) loved it.

[jaylo264]

thanks guys , it's so old the seller has no idea of year and wants £450 for it .



?
jaylo

[Titus A Duxass]

thanks guys , it's so old the seller has no idea of year and wants £450 for it .



?
jaylo

Walk away at that price, that's way over the top for an ancient (but good) bike.
They were quite ringy-ding-dingy as I recall.

[Rozzo]

thanks guys , it's so old the seller has no idea of year and wants £450 for it .



?
jaylo

Walk away at that price, that's way over the top for an ancient (but good) bike.
They were quite ringy-ding-dingy as I recall.

the problem is that there aren't that many purpose built trials bikes for kids,, its not a play bike it's a dedicated competition bike and just like kids motocrossers they always get good money. i'd say it isn't that expensive if its complete.
to illustrate that look at this http://cgi.ebay.co.uk/yamaha-ty80-trial ... C294%3A100" onclick="window.open(this.href);return false;

[quagmire]

they weigh a ton mate,i got callum one,but they are so heavy so i got him a little beta for£650,was mint tho.then i got him a gasgas txt50 boy.great little bike,think i paid about £575(but that was a steal).the rattle probably is the fins but could be the rings.pi$$ easy to fit tho and always available.

[weerickyni]

try a slighty younger bike like a kx they can come with smaller wheels loads of people getting rid of trials/scrambler bikes at the min.. for £450 u should get a pretty good usable bike!

[Red Westie]

Little end (needle roller bearing) noise? very common (will need a gudgeon pin at the same time) not very expensive.
As long as it's not a rumble which may indicate a possible (crank rebuild)
Martin

[jaylo264]

Ta , fellas , i did walk away from it , and my wee lad didnae fancy it anyway , wants a Beta like his big bro . The seller said he had fitted new rings and top end bearing , but it was absolutely no comparison to that ebay one at 1200 smackers -- lovely that one !
ta again,
jaylo

[Snag20]

Ive just bought a Sachs ZX125--road registered (2000) but NOT running. Had a new barrel and piston fitted. Has some wiring issues as it has previously been alight and repairs attempted/started.

Anybody got a wiring diagram ? I believe this bike is a copy of a Yamaha DT125 but not sure which model ?

Any body know much about Power valve set up ??


Treve may be calling on you kind assistance as my local crosser expert !!

cheers