ypvs engine with poor midrange

[dougb]

hi,
just joined the forum,some of you might know me, have a few strokers including my mito 350.i've just got hold of a tdr with a 350 motor in it,i've got it running and mot'd today,the bottom and top ends rev cleanly and pull well......but the midrage is quite lacluster,its running standard carbs with swarbrick kit pipes(up and over tdr style) and a y boot filter,has anyone heard of the y boots giving midrange problems,everything else i can think of seems to be set up well.
cheers
dog

[Norbo]

With Swarbrix you will allways have a big holl they take a lot of jetting id play about with jets needle positions and pilet jets all so think about reed spacers / I don't thing the filter will be doing it .

[dougb]

Thanks for that norbo

[dougb]

found the problem in the end,who ever wired the bike originally,had incorrectly connected the pv servo rpm sense wire into the kill switch system because it was the same colour !