Lowered Base Gasket from .5 to .3, now bog at WOT

[hannesd]

tighten your pants ,she's gonna rip your arms off now!

[Doc Brown]

You change your base gasket because the bike bogs?

The 188 is far too big, even for a 250 that's ridden heard in deep sand. As the guys suggested get a 175 or 178...

[brads1725]

Dropped it progressively from 188 to a 178 then down to a 175. Still got the same issue. Might be an ignition problem, new plug and gapped correctly.
Some one has been mucking about in this carb though so it is throwing me off the scent - to go with the 188 MJ they had the needle clip on position 1 for leanest. Also running a N1EH needle which looks like its for altitude, manual says it should be running a N1EF. Although I am not sure if we are talking massive difference here
I have switched back to 175MJ, 40Pilot, Clip 3. Still bogs with a wrist full to WOT but idle and low end up to 1/2 it runs great.
Anyone had coil or lead problems causing a WOT misfire? What is the best diagnosis route?

[gg3]

Hi,
I agree with Hanesd regarding the power valve.I had a similar issue after a top end.I had not assembled the power valve properly.Muppet.

[brads1725]

Yeah i was thinking that too so I pulled the side cover off the exhaust side, then put the exhaust back on, all moves freely when you rev it. rod moves up and down and the assembly rotates when the rpm comes up

[gg3]

Good work.That would have been too easy.Did you check if you turn the power valve actuator by hand & look in the exhaust port,is the centre valve opening fully & the left & right rotary valves are opening & closing at the right time? ie calibrated correctly.Lay the bike down on the left side when doing this so the centrifugal balls don't fall out. haha I said balls.

[(F5)]

If it's a stator coil it will get progressively worse as it heats up.
Check muffler isn't collapsed.

Does it rev out at moderate light load running?

The std N1EF needle will be junk, but it should at least rev out. I'd look in jetting thread, not sure on those series if H does much. Wonder if it's too thin at WFO and main is still too big.

Look up a decent needle and try again before going too small on mj

[brads1725]

Took the bike out over the weekend and it is running mint, no bog at any stage. The previous owner has put and inline filter in the fuel hose. After pulling it I could see how terrible the flow was through it. I think after riding a bit the bowl would drain down and not leave enough fuel, it really was just a trickle coming out under the gravity feed.
With that out and the jetting back to manual specs its going great. Too good in fact, shot me off trail a few times

[Moto7man]

Here is Jake?s build with port timing info starting at post 75.

http://www.gasgasrider.org/forum/sho...el+port&page=8

[(F5)]

Ahh. That's my pet hate. Inline filters. Someone needs to invent a curved one. I've seen, used a right angled one but it didn't seem to cure all faults.