My boys moped

#1
Could any of you advise me on how to make my boy's moped perform a little bit better?
Its a four stroke 50cc, it is very sluggish at bottom and takes an age to start.
Its in bit in my back room as we speak.
Thanks.
 

Ravers

LE
Kit Reviewer
Book Reviewer
#2
It's probably restricted to 30 mph, new exhaust and carb jets should give it a bit more poke.

Edited to add: If he's under 17 and gets tugged by the rozzers, he will get done and his insurance will probably be invalidated so be careful.
 
#4
Could any of you advise me on how to make my boy's moped perform a little bit better?
Its a four stroke 50cc, it is very sluggish at bottom and takes an age to start.
Its in bit in my back room as we speak.
Thanks.
4 strokes are very hard to gain any extra power from especially a 50cc, as there are no restrictors as such like in a 2 stroke, but get a metal coat hanger and try and pull the baffles out of the exhaust pipe.
 
#6
Has it always been this way or is it getting worse?
Halfords do some carb cleaning additives-could have a sticky carb
plugs and fuel filter too....
 

Ravers

LE
Kit Reviewer
Book Reviewer
#7
I'm pretty sure 50cc mopeds are supposed to be restricted to 30mph by law. You can de-restrict them if you have a full car or bike licence but not if you are riding around on L plates. The rules for geared bikes are different.

Basically if plod sees your lad whizzing by at 50, they will most likely pull him. Also if he has a crash and the insurers want to be really arsey, they won't pay out.
 
#9
All 50cc bikes on L plates are meant to be restricted to 30mph, but ive had 50cc (2strokes) doing 65mph+ when i was younger, but as i said thumpers (4 strokes) do not have restrictors on them, also an exhaust pipe will be a waste of time, the only restrictor on most 50cc four strokes is a cone (baffles) inside the exhaust pipe, as for getting nicked you wont get nicked by "de-restricting" the standard pipe as the wouldnt know, but if you put on and after market pipe, ur holding your hands up to changing the performance, bhp, top speed of the bike,

what bike is it?
 
#11
If it`s got poor starting whip the carb off, take the float chamber off and clean it out including the jets and blow out any holes you can see.
You can go 10 higher on the main jet (if the original is 54, pop in a 64 or thereabouts).
Sometimes there`s a brass plate with some holes drilled in it, between carb and air filter trunking, pull it out and discard it.
Clean the air filter and pop a new fuel filter on (they`re normally small on mopeds but it doesn`t affect the flow).
If it`s an automatic you can replace the rollers with lighter ones, this`ll give you slightly better acceleration but don`t go too light as what you gain at the bottom you will lose on top end.
Check the rollers that are in it first to make sure they are round. They wear and get flat sections on them which makes them stick.
On a four stroke make sure the tappets are adjusted correctly as a lot of people don`t bother to check them, especially on mopeds/scoots.
 
#13
Make is JINLUN, looks to be made in China. That's not good.
nope its a boaton import, from ebay normally around the 400 quid brand new, when i was around the age of moped riding and on forums etc i heard nothing but bad words about them, personally bikes that sluggish i think are so dangerous, trying to pull away from roundabouts and junctions. my advice would be trade it in for something a bit better unless hes turning 17 soon then hang out for a 125
 
#14
If it`s got poor starting whip the carb off, take the float chamber off and clean it out including the jets and blow out any holes you can see.
You can go 10 higher on the main jet (if the original is 54, pop in a 64 or thereabouts).
Sometimes there`s a brass plate with some holes drilled in it, between carb and air filter trunking, pull it out and discard it.
Clean the air filter and pop a new fuel filter on (they`re normally small on mopeds but it doesn`t affect the flow).
If it`s an automatic you can replace the rollers with lighter ones, this`ll give you slightly better acceleration but don`t go too light as what you gain at the bottom you will lose on top end.
Check the rollers that are in it first to make sure they are round. They wear and get flat sections on them which makes them stick.
On a four stroke make sure the tappets are adjusted correctly as a lot of people don`t bother to check them, especially on mopeds/scoots.
Is that easy enough?
 
#15
nope its a boaton import, from ebay normally around the 400 quid brand new, when i was around the age of moped riding and on forums etc i heard nothing but bad words about them, personally bikes that sluggish i think are so dangerous, trying to pull away from roundabouts and junctions. my advice would be trade it in for something a bit better unless hes turning 17 soon then hang out for a 125
He has just passed his CBT on it, will look on e bay now for another moped i think.
Thank you for your advise.
 
#16
get a 2stroke, I recomend either a Yamaha jog r , Aprillia Sr50 these are the best two as far as i am concerned and from experience
 
#17
Make is JINLUN, looks to be made in China. That's not good.
You get what you pay for unfortunately, but chinese scoots tend to suffer from poor materials and poor quality control, other than that they`re no worse than other scoots once the initial problems are sorted. It`s common for poor starting on them as swarf and crap tends to get left in the tank and carb from the manufacturing process instead of swilled out.
Tappets are fairly easy once you`ve got the bodywork off to gain access to the tappet cover, there`s only two to adjust. Haynes do a manual for chinese scoots which is worth buying, it`ll guide you through the process.
 
#19
Sorry missed the other question you had about hard to start

When restricted they run a little lean derestricting them cures this

Plus if you are feeling flush or just bored you can order an 80cc kit from Germany (I did dont mention it to the bride). Its great for traffic a bigger bike will get just as stuck as a car where I am so with the price of fuel as well its a real money saver.

I am aware I look like a girl on it
 
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