Mi­nor jet fret

Practical Sportsbikes (UK) - - What’s The Problem? -

I’m cur­rently re­fur­bish­ing a Kawasaki GPZ750 A1 and it has been fit­ted with a Mo­tad Neta 4-into-1 ex­haust. I’ve stripped the carbs down and the main jets have been in­creased from 110 to 130. Is this nec­es­sary for the cur­rent ex­haust as I have read con­flict­ing re­ports? I would like to put the bike back to fac­tory set­tings if pos­si­ble. Air­box and fil­ter are stan­dard. Si­mon Mccorkin­dale, email

Gary Hurd says: Usu­ally with Mo­tad sys­tems no re­jet­ting is re­quired. So go back to stan­dard and see what it does, es­pe­cially given that you’re still on the stan­dard air­box and fil­ter. There’s no point in chuck­ing fuel away on hav­ing main jets that are too big. There’ll be no more power and more than likely the bike will feel a bit flat.

Still a hand­some-look­ing tool af­ter all these years

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