My CG125 Is back firing

[ars3n1ck]

Hi everyone, I'll doubled this as my Hello msg as its my first post.

I ride a 1992 cg125 brazil. i bought it six months ago. I've recently had the engine replaced as the previous one started to sound like a cross between a hammer drill and a diesel tank. I was told the crank was on its way and a new engine would be best.

The new engine is in place and it sound loads better. much quieter.
I think the engine seems to run a bit flat. it gets up to fifty and then doesn't get to sixty quite a quick as the previous one. When I downshift coming to a roundabout or slowing down it backfires.
The old one never did this. I've had new engine for two days and its got 1 months warranty so i want to get this fixed while its free.

Has anyone got any idea what the problem is as I dont want fobbing off when i take it in. May stand better chance if i have an idea what i'm talking bout.

Thanks

Nick

[hmmmnz]

it sounds like you have an airbox air leak, check all the connections between airbox and carbs.
another possibility is exhaust leak
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[shammon]

Backfire in a cg i had once it was the sparkplug on its way out, result was sorted with a new plug, at idle it was ok but worse when i reved it up.
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