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Backfiring On Evo 4T

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Hey guys I've had a few problems lately with the backfiring issues , it turned out that the exhaust wasn't sealed correctly which sorted it out , but then it's started with a new problem , somebody told me to richen the carb so I dropped the needle to the bottom setting on the pin but when it warmed up a had a different problem it would be hard to start , if I blipped the throttle the idle would drop below and nearly stall so I have taken the pin up 2 settings and its backfiring again I'm gonna drop it down one and see what that is like , but my question is , I went out today in really bad weather and as soon as it got into the wind and rain it ran really bad , was hardly ticking over and backfiring like mad , when the weather calmed down it ran a lot better could this be a sign of anything , any help would be appreciated cheers guys

Mine backfires with the hot start out on it. I've not messed with the needle although my Rev 4 used to be a bugger to start sometimes. Check the carb boot. They're not the best.

Long shot, but check your air box has not got oil in the base from the engine breather.

This can cause poor running and backfiring particularly on large throttle openings ie on hill climbs.

Edited by jfc

  • Author

Carb boot tight, there is a rubber seal on the hot start that beta say can cause a backfire so might be worth a look on yours, strange with the bad weather with mine today though ?

  • Author

It's not backfiring on hill climbs only on the shut off when ya Rev it

Mine does it when freewheeling with throttle shut. Especially going down hills on the road!

It runs well though so havn't fiddled

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Apparently big thumpers do burble on the overrun

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Also I've bought a side stand and support does anybody have any idea how the support bolts on as the bracket looks completely wrong I can see the 2 alloy coil holes inside swing arm but the holes in the support are completely different I've checked part number and it seems to be the correct one they have sent , could do with seeing one really but hard to fing 4t s about

It mounts funny. Opposite side to the 2t's. Very often it needs a tweak once fitted to sit flush

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I think they have sent me the wrong bracket it's got the right part number but it is completely wrong I've just found a post on here with a picture of one and it's completely different

When i had one it had a backfire, but didnt fiddle as it ran well and wasnt a problem.

only time it caught me out, it blew the carb boot off during a trial! Didnt realise as it was just off (couldnt tell) , wouldnt start, long push back to the car. Realised what it was when I got home, and was just happy it wasnt high expense ! So check jubilee clip tightness .....

cheers

john

  • Author

Yep I'll double check that , there must be a air leak somewhere if it affected it in high winds it's just finding it that's gonna be a ball ache but thanks guys for your help much appreciated

I think they have sent me the wrong bracket it's got the right part number but it is completely wrong I've just found a post on here with a picture of one and it's completely different

What year model is your bike? I remember the kickstand mounts changed mid year in 2009 when Beta updated their swingarm design.

Popping on deceleration is a lean condition and can usually be corrected by turning the fuel screw out,

  • Author

It's a 2014 , it has to be the wrong bracket it's nothing like it will fit I've tried every way possible I've git pics but I'm useless on here can't figure how to post them

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