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Mikuni HSR carby

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drmini in aust

Post subject: Mikuni HSR carby

Posted: Sat Mar 14, 2015 5:55 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39757
Location: near Baulkham Hills, NSW

I spent a little time today helping tune Gafmo's Mikuni HSR45? carby on his (was once mine)1412 stroker.
Pretty simple to tune, compared to an SU or Weber. Just an idle mixture screw, idle jet, a needle and a main jet.
I put the A/F meter on, and we went for a thrash.
Main problem was, it was going too lean at full throttle with the biggest main jet they can supply (a 220, = 2.20mm diameter). And midrange was a little rich.
I drilled a spare main jet out to 2.40mm, we dropped the needle by a notch, and VROOOOMM!! Numbers now good, it hauls ass, and sounds great too.

http://www.mikunipower.com/Catalog/Miku ... g36-01.htm

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

Last edited by drmini in aust on Sat Mar 14, 2015 6:54 pm, edited 3 times in total.

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Diesel27

Post subject: Re: Mikuni HSR carby

Posted: Sat Mar 14, 2015 6:30 pm

848cc

Joined: Sat Sep 21, 2013 9:47 pm
Posts: 324
Location: Melbourne West

genius

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MG Rocket

Post subject: Re: Mikuni HSR carby

Posted: Sun Mar 15, 2015 8:46 am

1275cc

Joined: Sat May 02, 2009 4:53 pm
Posts: 3135
Location: Port Stephens, a little north of Newcastle, Australia

GR should try out one of these on the dyno, see how it goes.

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drmini in aust

Post subject: Re: Mikuni HSR carby

Posted: Sun Mar 15, 2015 9:56 am

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39757
Location: near Baulkham Hills, NSW

Throttle response is better than an SU, sounds better too. But it doesn't sound like a pair of Harleys (as a Weber or Dellorto does).

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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simon k

Post subject: Re: Mikuni HSR carby

Posted: Mon Mar 16, 2015 8:28 am

Yay For Hay!

Joined: Wed Sep 08, 2004 9:27 pm
Posts: 15912
Location: Wodonga - Vic/NSW border

what accelerator pump adjustment does it have?

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drmini in aust

Post subject: Re: Mikuni HSR carby

Posted: Mon Mar 16, 2015 9:28 am

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39757
Location: near Baulkham Hills, NSW

simon k wrote:

what accelerator pump adjustment does it have?

http://www.mikuni.com/pdf/hsr_tuningmanual_021003.pdf
See p6 & p7.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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simon k

Post subject: Re: Mikuni HSR carby

Posted: Tue Mar 17, 2015 2:59 pm

Yay For Hay!

Joined: Wed Sep 08, 2004 9:27 pm
Posts: 15912
Location: Wodonga - Vic/NSW border

cool - one of the main problems when using a supercharger is the lack of a "proper" accelerator pump

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