Speedfight needs full throttle to move?????

Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

I have a 2000 50cc liquid cooled speedfight which has had a sports exhaust, 80 jet, 70cc bore kit and a new sports air filter. I have just had the engine rebuilt and since then when its running I have to give it full throttle to get it moving and keep the throttle full and it wont do more than 30 mph. I have checked the clutch and that seems to be fine. On tick over it runs really well, I am completley lost now and am hoping for some pointers. Thanks, Rob

Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

just replaced the 80 jet for the 72 that was in it and cleaned the carb out but it has made the problem worse than it was before.
Sad

speedjunkie20... · Nova Slayer Joined: 04 Mar 2009 Karma :

Jet size is way to low mate you'll seize your engine, what air filter do you have, Im running on the blue polini sponge and am using a size 105 jet with my setup on a gilera storm, try a 100 jet in yours or something similar.

Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

I am not sure of the make of filter but it is 1 of the k&n ones, I will see if I can get 1 for tomorrow and see what happens cheers for the advice.

cal91 · Nearly there... Joined: 16 Apr 2008 Karma :

This makes me laugh, i will get in there before anyone else does.

Its a 50cc scooter, its not gonna go much faster.

But for giggles, get a bigger jet.

Oh and you havent tried to clean your air filter by any chance?
Or has the new engine been run-in yet?
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Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

It is a new air filter and the engine has not been run in yet cant get it to run well enough to try yet. Before the new barrel and piston were put on I was getting about 60 - 65mph so thats why I am wondering why it is slow.

cal91 · Nearly there... Joined: 16 Apr 2008 Karma :

Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

Thats the thing, to get it to even move I need to use full throttle so hopefully the advice will help and make it possible for me to run it in lol. Laughing

cal91 · Nearly there... Joined: 16 Apr 2008 Karma :

Like is said, try leaving it on tick-over for a while.
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Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

Did have it running for about an hour but had to turn it off cos the temp gauge was way too high and didnt want to weld the piston to the barrel lol

cal91 · Nearly there... Joined: 16 Apr 2008 Karma :

Is there enough 2t oil getting to the piston?

Seems strange for it to get too hot.
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Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

I put 2 caps full into the fuel tank and the oil is going through the inline filter so I would imagine it is getting to the cylinder. Is there an easy way to make sure?

cal91 · Nearly there... Joined: 16 Apr 2008 Karma :

No that should be enough tbh.

You could check by pulling the oil feed pipe out and see if the oil is flowing, but that would be a arse on.

If in doubt, drain your oil tank and just use a pre-mix in your fuel tank for now.
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We are the Patriots! Love your country.

Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

When the engine was taken off the oil wa flowing well so needed to be plugged and when the plug was removed it started to run again so seems to be fine!

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

how do you adjust the needle? I have not really had the carb in too many bits so not too sure exactly how it works.

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

https://home.wanadoo.nl/xavira/carbmc/carb_needle.jpg

By moving the circlip down the needle, it raises the needle up and creates a richer mixture.

You will have to remove the slide to get to it.

Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

cheers will try that in a bit just need a coffee to wake up lol Laughing

I take it that it only needs to be moved a mm or so?

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

Robert711 · Two Stroke Sniffer Joined: 10 Mar 2009 Karma :

Even easier lol cant really go wrong (I hope ) Confused

cal91 · Nearly there... Joined: 16 Apr 2008 Karma :

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

80 main jet seems small for a 70 kitted bike with a "race" exhaust.

I'd go up a few jet sizes and go from there. Seems like its running VERY lean.

Ben

cal91 · Nearly there... Joined: 16 Apr 2008 Karma :

Dav1son · Trackday Trickster Joined: 24 Jun 2006 Karma :