I'll keep you guys updated when I get the larger jets.

 

Heres what the spark plug looks like. Does it looks lean, rich, or normal?

 

Hard to see from your pic, tip looks light gray but around the thread looks black, is that black an oily residue? For most accurate plug reading.....go for a short ride, run it fairly hard and shut off the engine while cruising down the road, pull plug and read it without the engine comming down on idle. It is the running color you need, not the idle color.

 

This was pulled after I rode around for a while

 

Looks slightly lean to me, not seriously, or threaded part would be white, but it certainly isn't on the rich side or the porcelain would be black, very light brown is spot on, but that looks a bit too white.

 

Another update:

My airbox lid came in. After putting it on, the ATV begun to bog at high throttle. At lower throttle there is no bog at all. It seems to start a little easier however, and it will rev without bogging in neutral on a cold start.

With the lid off, it doesn't bog like how it does with it on.

Here are 2 videos of it with the lid on: ​​​ In the first video, near the end I am only going mid throttle with no bogging, but at the end I go full throttle which causes it to bog out on me.

Here is a video of it with the lid off: At top speed, it sputters a little. It tops out at 44mph even though a Raptor 250 should go 50-60. (A raptor 125 goes 45mph)

With the lid off, it will only sputter a little when I'm at top speed, but with it on it bogs like crazy at full throttle.

There are no gas or oil leaks at all.

I would figure that putting an airbox lid on would help if it is running lean because it will cut airflow (I am running an FMF slip on exhaust though).

Could it possibly be that its rich with the lid on, or the carb clogged, or does anyone have any other ideas as to what it could be?

 

Air intakes are a "tuned length" any deviation from the factory setting will upset the carb, may run rich, may run weak, it is a "suck it and see" situation if you alter either air intake or exhaust, especially on a "performance" bike. I know from other postings on here, Honda Recons run rich if you remove the airbox lid.

 

Yeah

 

Hey all, I have an update on the carb issue.



Its most likely not the main jet being too small because it runs fine full throttle at first, it only begins to bog after 30mph in 5th gear at high rpms for a while, and even with the choke on (cutting airflow), it doesn't run any better - still starved for fuel after running high rpms



What I suspect is that the float is not allowing enough fuel into the bowl causing the carburetor to drain faster than it can provide fuel at high rpms, which causes the RPMs to come to a stand still in 5th gear after a while, topping it out at 44 (rather than around 60).