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Bogging In Forth Gear


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#1 the sweeney

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Posted 09 May 2019 - 08:26 PM

Mini 1000 - HS4 carb

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                                     hi all just replaced the coil, points, condensor, rotor arm, dizzy cap, plugs n leads, new float needle, new wax stat jet, new AAc needle- Mini is vastly improved , starts on the button, pulls smoothly in all gears.........until i hit 4th gear then it bogs down, any ideas?

its got a K&N filter and full free flow exhaust 



#2 cal844

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Posted 09 May 2019 - 08:45 PM

When was the ignition system last serviced? Try another, different branded coil.

I had this issue on my 998 a few years ago, ironically after a clutch and water pump change... We changed the carb, complete known working electronic dizzy and new (eBay sourced) coil (car has a 65D dizzy and GCL143 equivalent coil) the issue actually got worse.

We changed to a locally sourced coil and it never misses a beat.

#3 unburntfuelinthemorning

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Posted 09 May 2019 - 08:46 PM

Has it got a high final drive ratio?  That kills fourth gear acceleration.



#4 the sweeney

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Posted 09 May 2019 - 09:10 PM

Ignition just done, - its booked in for a tune up weds ,im pretty  final drive is standard BL but its odd its only bogging in 4th

 

thanks for replys



#5 hhhh

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Posted 09 May 2019 - 09:28 PM

Could be the fuel filter.



#6 the sweeney

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Posted 20 May 2019 - 09:06 PM

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.....well bogging much better, id fitted a non wax stat jet , which looked new ish and my new needle, they obviously didnt match hence the bogging, ive since replcaced with a wax stat jet and matching needle, and its 90% better, i think ive been a bit to harsh with the mini as im so used to modern TDI diesels.

 I ve looked at engine conversions, but i dont want to go through all the hacking and chopping

Ive had the Mini upto 75mph, it was screaming , what sort of cruising speed would a 1275 do??

 Its looking hard though now to find a good 1275 or 1300 forsale???


Edited by the sweeney, 20 May 2019 - 09:09 PM.


#7 croc7

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Posted 21 May 2019 - 01:43 AM

With a 3.44:1 final drive, your tach should show about 3650 RPM @ 60 MPH on ten inch tires, regardless of engine size.




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