2016 Raptor 90 Carburetor help - Yamaha Raptor Forum
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post #1 of 7 (permalink) Old 04-09-2019, 08:49 AM Thread Starter
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2016 Raptor 90 Carburetor help

I recently purchased a 2016 raptor 90. I installed a HMF exhuast and deleted the air box. I installed a KNN filter with an outerwear cover. I need to rejet it or upgrade the carburetor. I went to a couple of my local motorsports stores and they don't carry they type of jets that this thing has. The carburetor had stamped Sunworld and the model number H66D. I have no idea what size carburetor it is. Or what type of jets will work on it. Can someone look at their 90 and see if the carburetor is the same. Has any one had any success rejecting these quads.

Thanks for the help
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post #2 of 7 (permalink) Old 04-09-2019, 08:54 AM Thread Starter
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post #3 of 7 (permalink) Old 04-09-2019, 08:58 AM
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I drilled out the jets
Micro drills on ebay!

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post #4 of 7 (permalink) Old 04-09-2019, 09:31 AM Thread Starter
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I wouldn't know what to drill them to. If I go too big I wouldn't be able to go back. I need to find an assortment of jets. Or upgrade the carb.
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post #5 of 7 (permalink) Old 04-09-2019, 10:23 AM
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Read my thread that I just commented, best bet is to ditch the stock 13mm carb and if you motor is still stock I would go with a 18mm aftermarket carb, we were at a 22mm and the bike ripped but tuning was a nightmare for the low end so we backed down to a 20mm carb but we also have a bigger piston, head, and cam
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post #6 of 7 (permalink) Old 07-29-2019, 02:50 PM
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I have replaced the oem carb with a 26mm mikuni and made my own 28mm exhaust. ( oem 25mm)
Also did dr pulley primary weights and softer spring in the secondary clutch. Great improvement. Much stronger.


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post #7 of 7 (permalink) Old 10-02-2019, 12:10 PM
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For those out there looking for some clarification on the stock carburetor on the 2016-2019 model, I have done some extensive research and minor modifications to a 2017 and thought my experience might benefit others.
The stock Sun World H66 carburetor uses Keihin jets. The pilot jet is a size 40 and the main jet is size 82. Replacing the header and exhaust does not affect the idle or run quality of the little 90cc but opening the air box makes rejetting the carburetor a necessity. Taking both jets up a size or two will help alleviate the clogging of the idle jet and provide a proper mix when combined with the increased airflow.
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