Author Topic: 49 Intek Nikki carb drilling jets  (Read 3566 times)

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Offline K K racing

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49 Intek Nikki carb drilling jets
« on: October 18, 2017, 05:32:56 am »
I have an internally standard 49 Briggs V-Twin with a billet flywheel, I  have fitted the billet aluminium adapter to the Nikki carb with an after market air cleaner (as from EC Carbs). Wondering if someone could give me some idea of what size the main jets might need to be drilled to. Standard they seem to be 1.3mm. I have tried 1.8mm and 2mm but off the line (standing start) the engine bogs and won't pull hard. Any helpful info will be appreciated.

Offline Mower Maniac

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Re: 49 Intek Nikki carb drilling jets
« Reply #1 on: October 18, 2017, 03:23:47 pm »
Probably too rich. Now that the deed is done, I would say to try and retard the cam timing a tooth or 2. Should stay same on bottom, and may give slightly better mid range.
AZLMRA
2016-GPK 3rd place
2017-GPK 2nd place

Offline Mower Maniac

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Re: 49 Intek Nikki carb drilling jets
« Reply #2 on: October 18, 2017, 03:26:09 pm »
Maybe do a port and polish on the heads, and put copper head gaskets for a little compression, and might not need retard or might just need 1 tooth
AZLMRA
2016-GPK 3rd place
2017-GPK 2nd place

Offline PJG56

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Re: 49 Intek Nikki carb drilling jets
« Reply #3 on: October 18, 2017, 05:03:55 pm »
I have an internally standard 49 Briggs V-Twin with a billet flywheel, I  have fitted the billet aluminium adapter to the Nikki carb with an after market air cleaner (as from EC Carbs). Wondering if someone could give me some idea of what size the main jets might need to be drilled to. Standard they seem to be 1.3mm. I have tried 1.8mm and 2mm but off the line (standing start) the engine bogs and won't pull hard. Any helpful info will be appreciated.

I'd solder up jets, to original size and open up lowside just a touch to get better throttle response,keep an eye on plug readings, if to lean open mains up just a thousandth or 2 and go run it.
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
2013 ARMA national champion Mod-X(builder/owner)
2014 ARMA national champion Mod-X(builder/owner)
2014 All American Champion Mod-X/CP(builder/owner)
2014All American Champion FXT (engine builder)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)

Offline K K racing

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Re: 49 Intek Nikki carb drilling jets
« Reply #4 on: October 18, 2017, 05:45:08 pm »
Thanks for the quick reply's. I'll give them a try.

 

anything