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1 stud build
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11670
Location: PacNW

PostPosted: Sun May 09, 2021 5:22 am    Post subject: Reply with quote

I feel like these motors benefit from longish runners, and that shorty runners with ITBs will hurt drivability.

But, as some may point out, WTH do I know?



Looks like a fun build.
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  • WeiBe (1987 924S) - 931 S3
  • Red (1987 924S) - Pro44/Spec944
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Juho  



Joined: 03 Oct 2018
Posts: 291
Location: Finland

PostPosted: Wed May 12, 2021 6:48 pm    Post subject: Reply with quote




3dprinted velocitystacks and adapters for zzr600 carbs
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Juho  



Joined: 03 Oct 2018
Posts: 291
Location: Finland

PostPosted: Fri May 14, 2021 5:18 pm    Post subject: Reply with quote

cant get bike carbs to run good, rpms dont go back to idle after pressing gas, ive checked for air leaks with brake cleaner and cable is good, any idea what could cause this?
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safe  



Joined: 18 Mar 2017
Posts: 303
Location: Sweden

PostPosted: Fri May 14, 2021 5:45 pm    Post subject: Reply with quote

Vacuum leaks
Idle screws to far out
Throttle plates not not closing enough, there is an adjustable stop I guess. The plates should not close completely just shy of touching the bore, otherwise there will be wear on the bore.

Have you synchronised them? its sort of a bitch to get all the throttle plates and idle screws the same and get them to draw the same amount of air. You will need a set of 4 vacuum gauges for this or an old school "thing" you put in the bell mouth. https://www.amazon.com/s?k=carburator+balance&ref=nb_sb_noss

Look up a workshop manual for the bike, it will have a section on balancing the carbs.
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Porsche 924 -79 NA, under EFI and turbo conversion
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Juho  



Joined: 03 Oct 2018
Posts: 291
Location: Finland

PostPosted: Fri May 14, 2021 11:39 pm    Post subject: Reply with quote

Ordered this https://www.amazon.com/gp/product/B003LIX3WK/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1


New adjustable needles, 160 jets and rebuild kit, hopefully i get the car to run good with these
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Juho  



Joined: 03 Oct 2018
Posts: 291
Location: Finland

PostPosted: Tue May 18, 2021 5:02 am    Post subject: Reply with quote



Cleaned carbs today
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