woodburnyq50

Cnt advice of speed difference either mine had 70 kit on but fried cylinder so put a 50 back on it, by anychance do you know wha the standard size jet is?

Didn't know that was a restriction :S took it of mine when I rebuilt engine because I forgot it and didn't want to strip it back down lazy and lucky, what other restrictions are there on the aerox?

Didn't think there wud be muich difference in price from ebay and dealers, will just do that tomorrow instead if I nobody let's me know before hand thanks airhead

would both the main and pilot jet of been changed when it got the 70cc kit on it? so i would have to replace both of these? or just replace the main jet?

Probablys a long shot but does anybody know the standard main jet size for a yamaha aerox yq50? Going to buy of ebay but not sure of the standard size

I had it on idle for about 20 minutes took it out and it was a really dark choclaty brown, close to a black, I will pop to the dealers on tuesday and see if they have any jets in stock, fingers crossd they do and I can get it running thanks for the advice lads, will update when I get new jets

I don't know what jet is in at the minute I'm just geussin it isn't standard with havin a 70 kit on previously but still has standard air box, so standard size jet should sort the problem out?

Mines a 54 so must of changed in 2004

Or could this be wrong jet size? With going from a 70 back to a 50?

Got all of the aerox back together went to go for a test ride and there's no power, does not want to move with me on it, but if I lift the back wheel it will spin, could this be the carb setup been wrong, or something else? It did have a 70 kit on before the piston and cylinder went, just fitted a standard 50cc one now tho, any ideas would be much appreciated, desperatly need it fixed

That is a different style of pump than the one that I have fiitted

I'm rather confused at what part u mean turn by hand :S would u possibly get picture of internet to point it out to me? As I am new to this and tend to struggle

Wouldn't tht just have the same effect as using a drill to turn it? That was my original understandin anyway

What do you mean by hold pump pulley fully open?

How do you suggest testing it whilst it is in place? (Attachd to engine)

And incase I done it wrong is there a proper way of bleeding the oil pump?

In take the oil feed of the carb to see if itworks using the engine to power it? And use premix to lube engine while I do this test?

TooK the pump of the engine and put the end in a drill soit wud spin as if was attached to engine, undone the bleed screw and bled it, and with one pipe in a tub of oil, used the drill to spin pump, and nothing came out of other pipe, put finger over end and wasn't even any pressure at all against my finger

I'm not sure why the pump has stopped tbh bur I took it of and put the end in a drill, to spin it and nothing at all happend, so waiting on gettin the money for new one so premix it is until that time, and 40/1 would mean one litre of oil for every 40 of petrol?

well finally got the engine back together and dicoverd the oil pump was no good hence the engine goin downhill.. as i stil need use i am going to use premix util i can afford to buy nw parts.. but my question is what ratio of petrol to oil should i use? any help appreciated

if i was to fit a 70cc big bore kit to my yq50, would i need to upgrade anything else for it to work properly?

well i managed to persuade local bike shop to take a look at the engine for me, free of charge, and found out exacly what my problem is.. turns out the oil pump had packed in and with no lubrication.. the piston and barrel is dead.. so need to source a new one. not buying from shop as 200 pound is to much. any links for what might fit from ebay? been looking at a 70cc big bore kit for 60 pounds

well finaly got round to checking it and the spark plug is brand new and it is also bone dry.. through bad judgement i found out tht it does have a spark (was holding plug and didnt click on and tried starting it. and it also does not start with the fuel cap off. would this mak it a problem with the carburettor? incorrectly adjusted or something else.

still got a spark, carb is defonately getin fuel as i checked, how would i check if the cylinder is gettin fuel? and how would i check for pinching on the piston? and what exacly is 'pinching'? sorry for the newbie questions, been mechanic for 4 year in military but never touched bikes or scooters, so not very confident quite yet

hiya guys, can anyone help me diagnose the fauly with my yamaha aerox yq50.. i was out one day riding it no problem then suddenyl it cut out. after about 10 minutes of sittin at the roadside like a lost spanner it started again. ran for a bit and then cut out, it done this about 5/6 time and now it just wont start. anybody have a idea of what it could be? carb is gettin fuel and checked and changed spark plug. could you point me in direction of what the most likely roblem could be and how to go about fixing it? any replies are much apreciated