hi my son has just bought a gillera 125 vx & when you twist throttle it bogs down then seems to rev but it really struggles . the rollers seem fine the belt is nearly new ,oh & its hard to reach 55 60 mph .. any help would be greatful as my son is getting down hearted caus he wants to go out and tear up the tarmac lol
has it got a aftermarket/sports exhaust? if so itll need jetting. check for air leaks in the inlet manifold/the air box rubber pipe.
the exhaust is not the standard one but its not performance style (big fat & ugly) lol will check the inlet , the air filter is standard as well . thx will av a look when it stops raining
pump and jet is all carb technical terms for things you ain't ready for yet.if its had a pipe change,might need a jet change too else it gets the wrong mixture and bogs...or could be things like rollers not suited to his style of riding and his own weight. Is he a big lad..some of these peds are restricted by design and dont go as fast as you think they should. I would have thought 60mph would be a good average though.how many miles it done?
thx for replys the bike seems to av ben plated with upon looking closer theres mollosi rollers and the clutch drum is after market . I have now found another problem the varriator as no teeth so it spins on the shaft , I need both starter and the inner plate that covers the rollers .. looks like my lads bought a right project .. oh spark plug was black and the electrode was realy worn down the gap was massive
lucky for me its not your old bike lol but yes its had a rough start , seems all runners get played with one way or another , now I,m left to pick up the bits ..
well at least hes got something to learn spannering on.if you don't want to spend too much you could get a standard variator and rollers and other bits,get him on the road for a while till he gets to know the bike and start mods from there.lighter rollers can make a difference in standard kits.seems like you have a big prob but it ain't that drastic...new variator complete and a plug and then see how it goes.
in my eyes anything can be repaired ,well almost lol just ordered a new variator front and back plate caus there is no teeth , so the project is on hold for now , but I will be back
Good on ya for doing a repair and not a replacement. So long as its done right,why the hell not.everyone's ride here is a project of some sort mate...your slot in no prob.
going to hope he picks up the spanners & I,ll watch ,, I got 2 projects of my own to sort out ones a Suzuki 50 converted to a 125 & I have a 750 trike to build
Hmmm, the vx 125. If it's stripped the variator fixed plate teeth, then check the crank splines for damage. If its happened too many time in the past, then it could spell long term trouble, i.e a new crank. Could also be that the crank nut wasn't tight enough or loctited. It should also have a shim washer between the two halves, if that is missing, when the bike is stood still and running at idle speed, it will try and pull itself forward. Standard roller weight is 7.2/7.4 grams. 20 x 17 size rollers or you can safely use 19 x 17. Air mix screw on the left hand side of the carb just above the float bowl, too far in and it will bog badly. I normally set them 1 1/2 to 2 turns out, see how it runs, then adjust if necessary. Plug should be a CR8E. Wash the sponge air filter out with hot water and fairy liqiud. Make sure the carb diaphram isnt torn or split, and the air box tube is fitted properly on the back of the carb. They dont like running without the airbox. Check that the temp gauge works properly, if not it can leave the auto choke on causing it to run rich and blackening the plug, then will start to misfire. Check the condition of the coil ht lead, and cap, the coil should be fixed on a bracket not hanging loose. I'll post anything else as and when i remember
