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Correct needles for HS4 SU's with K&N filters on 1500 Midget

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Correct needles for HS4 SU's with K&N filters on 1500 Midget #1 This topic is about my 1979 MG Midget 1500
Jewkesy Keith Jewkes Coventry, West Midlands, UK Sign in to contact 1979 MG Midget 1500 "Betty"	Topic Creator (OP) Apr 26, 2015 04:29 PM Joined 10 years ago 3 Posts

Hello all,

Apologies if this has been asked before. I am new to the forum and have tried searching for this topic, but cannot find any previous posts. My 1500 has a standard MGOC stainless steel exhaust system (not the sports one), but with a 4-2-1 manifold. I have added K&N filters and would like to get the mixture set up correctly. The carbs have the standard needles in at the moment, but I think the mixture is running weak at high openings and rich at tickover. Does anyone know what needles would be correct for this setup?

Thanks,

Keith

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Re: Correct needles for HS4 SU's with K&N filters on 1500 Midget #2
zippy brian j vista, CA, USA Sign in to contact 1966 Austin-Healey Sprite 1971 MG Midget MkIII	Apr 27, 2015 12:06 AM Joined 10 years ago 260 Posts

mr j my su tuning guide only goes to 76 it shows midget 74/76 hs4 #aud665 std needle cud10411 ece spec no others are listed thats the best i can come up with b

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Re: Correct needles for HS4 SU's with K&N filters on 1500 Midget #3
AmishIndy Seth Jones Glendale Heights, IL, USA Sign in to contact 1971 MG Midget MkIII "Guenevire" 2007 Mazda 3 "Porco Rosso"	Apr 27, 2015 04:58 AM Joined 13 years ago 5,849 Posts

Might be time to have the car dyne tuned if you're really trying to get it absolutely right.

Seth Jones

1971 MG Midget

www.SpridgetGuru.com

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Re: Correct needles for HS4 SU's with K&N filters on 1500 Midget #4
Jewkesy Keith Jewkes Coventry, West Midlands, UK Sign in to contact 1979 MG Midget 1500 "Betty"	Topic Creator (OP) Apr 28, 2015 01:27 PM Joined 10 years ago 3 Posts

OK, thanks Brian for looking. I was thinking of taking it down the rolling road, but if someone had done it before I would buy some needles and give it a go myself first with a colortune, carb balancer and timing light.. Thanks, Keith

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Re: Correct needles for HS4 SU's with K&N filters on 1500 Midget #5
YB Larry Y Englewood, OH, USA Sign in to contact	Apr 28, 2015 02:21 PM Joined 17 years ago 1,233 Posts

Recently installed HS4's on my '75 Midget. Originally from a Triumph Dolomite. MG Automotive did total rebuild...says carbs are same as on MGB with the exception of Triumph SU jets (red bottoms). Joe Curto recommended ABC needles and I purchased a set from him. Car runs wonderfully with no professional tune. Will probably take it to MG Automotive in the near future for a proper tune. I am running the K & N conical filters that I took off my '79 MGB, exhaust header (forget what brand) and a Spitfire waterpump/fan and a Monza free flow exhaust. I think the car runs better than it ever has.

Edited 1 time(s). Last edit at 2015-04-28 03:35 PM by YB.

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Re: Correct needles for HS4 SU's with K&N filters on 1500 Midget #6
Jewkesy Keith Jewkes Coventry, West Midlands, UK Sign in to contact 1979 MG Midget 1500 "Betty"	Topic Creator (OP) Apr 30, 2015 03:11 PM Joined 10 years ago 3 Posts

A quick update. Whilst working on the carbs again tonight, I found that the suction through the rear carb was a lot lower than the front. Found that one of the nuts / clamp was missing on the inlet manifold. Fitted one and the car runs 10 times better! Accelerates right through the rev range cleanly, which it wasn't doing before. Think my problems are over for now... May still get it to a dyno at some point though.

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Correct needles for HS4 SU's with K&N filters on 1500 Midget

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