Briggs Intek Main Jets

[ggoyeneche]

I've recently got a Briggs Intek 5hp 110402-0206-E1 running, but find that I'm still lean. Starts easily, good compression, no smoke. However engine hunts at idle and will die unless choke is closed one or two clicks. OK at part throttle and full throttle.

I'd like to go the a slightly richer main jet, but don't want to be guessing, as new jets are $7 or $8 each. According to IPL, correct jet for this motor is 694975. Other jets for same basic engine are 498976, 493673, and 695042. The larger 12 CID engine 121402-0194-E1 calls for 690048 Main Jet per IPL. Assume larger engine has main jet which flows more, but don't know that to be a fact.

Does anyone has a table which cross main jet part numbers to relative jet size? Or does any one have drill size specs for various Intek main jets? While I'd prefer not to drill, if I know what I'm doing that would be "plan B". Appreciate any help.

[KE4AVB]

Increase main jet in the bowl nut (694975) to between .7925mm and .80mm (1/32" @ .0312") and that should solve your problem. The problem is they use a high altitude jet for this type number with even smaller jet used when spec as a high altitude carburetor. I haven't had the opportunity to check the actually sizes of the other two standard factory jets (493763, 695042) for this model series.

Note: This is not a EPA Approve Mod

[ggoyeneche]

Thanks for your feedback. Increased size to #67 drill bit. Slightly larger (i.e. richer) than you recommended, but was successful. Engine now idles well and snap accelerates sharply with no choke.

[KE4AVB]

Thanks for your feedback. Increased size to #67 drill bit. Slightly larger (i.e. richer) than you recommended, but was successful. Engine now idles well and snap accelerates sharply with no choke.

Just makes it a #81 size jet; drill bit #67 = 0.032"(0.813 mm). That would have been a little too rich for the tiller here that the engine here was on but every engine is slightly different.