Won't rev above 8000?

FrazerDaley · L Plate Warrior Joined: 19 Jan 2012 Karma :

I have a Gilera DNA 50 2003 and it had been running fine from September last year until I replaced the exhaust due to a hole in the old one.

So I replaced the exhaust with a new aftermarket standard exhaust for my model but now the revs won't go above 8000, it take ages to reach the top end of 40-45 and as soon as I hit an incline of any sort it just loses power. The bike won't idle either, cuts out instantly.

I've done a little research and from what I can see its due to the engine running rich and I've narrowed the cause down to the jets in the carb. It has standard jets on the bike now, any suggestions on what size of jets for the new aftermarket exhaust?

Heres a few pictures too.

herulach · World Chat Champion Joined: 19 Apr 2010 Karma :

A DNA is a moped, so surely you mean the top speed is exactly 31mph? Confused

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YBR 125>FZS600

shippy · Nova Slayer Joined: 10 Jan 2012 Karma :

FrazerDaley · L Plate Warrior Joined: 19 Jan 2012 Karma :

No, it's derestricted, I should have mentioned that before.

FrazerDaley · L Plate Warrior Joined: 19 Jan 2012 Karma :

dangerousdave · Traffic Copper Joined: 22 Apr 2011 Karma :

go up one main jet size then check the plug colour.

if its not too white then you're ok.

a light brown colour is what you want.

also check your air filter is clean.
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1988 Kawasaki KMX 200

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MickC · Spanner Monkey Joined: 27 May 2011 Karma :

Are you sure it's the carbs, what colour is the plug ?. If it's a standard exhaust and yours is de-restricted it could cause and issue.
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