What head ? - Suzuki GSX-R Motorcycle Forums Gixxer.com
 
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post #1 of 5 (permalink) Old 01-09-2017, 12:52 AM Thread Starter
Squid
 
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What head ?

Hi guys,,i own a worked 1990 1100,,,previous owner told me it had a 1230 big bore kit,,and from the torque this beast makes I believe it,,,,,anyway I checked the valves and cleaned and balanced the carbs,,,then I removed the spark plugs and they are dpr9ea-9 where as the standard plug is a jr9b ,as far as I know no gsxrs ran this plug,,its smaller in diameter than the jr9b,,,,,,any ideas anyone? local Suzuki dealer told me that it could be a Yoshimura head as it is an ex race bike,,any input woul be appreciated.
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post #2 of 5 (permalink) Old 01-09-2017, 02:47 AM
Ghostrider
 
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Re: What head ?

dpr and J are the same:
12 mm thread
18 mm exagon
oem head with wrong spark plugs
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post #3 of 5 (permalink) Old 01-09-2017, 05:00 AM Thread Starter
Squid
 
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Re: What head ?

The j;s would not screw in the head and were visibly fatter,,same length though.
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post #4 of 5 (permalink) Old 01-09-2017, 10:15 AM
Ghostrider
 
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Re: What head ?

As i state J and DPR come with 12 mm thread 18 mm exagon
You ask , i answer
or even NGK wrote it down wrong?



https://www.ngk.de/fileadmin/Dokumen...en_code_en.pdf


p.s. yoshi head came with C type spark plugs
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post #5 of 5 (permalink) Old 01-13-2017, 06:31 AM
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Re: What head ?

Handy chart Ghost - I've saved that !
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