Sounds like a carb. Doing any popping or sounds like its running lean?

 

Nah no popping of the sort, doubt its lean but wont know till I yank it apart. I know its no uncommon either to need to do a valve adjustment when you get a few hours on all new stuff.

 

Could be the valves - but the issue being sporadic doesn't seem to make sense to me.

I could be wrong - but this almost sounds like a float related problem to me? Maybe the float needle in the carb is bad or sticking? What kind of fuel are you running? Anything that could have gummed up the float, float needle, or pilot jet?

 

Just plain jane 94 octane. Course it had been sitting for about a month since I last was out. Fuel was off but I didnt drain the bowl and I rode it around my yard a few times for only a few mins at best. I have an entire 04-05 carb for parts I can try swapping some stuff out if anything looks bad. Maybe float/float needle is sticking? Ill totally clean it out and check the valves anyways.

Thanks Gary

 

Think I found the issue, still gotta check the valves tho.

1. Hotstart cable, totally stretched and was being held open a bit. Replaced that.Possibly lean Im willing to bet was an issue with this.
2. Was slightly lean per the plug, went from 190 to 195.

Off to check the valves..

 

I woulda left the 190 in there if you think the plunger was stuck... Easy enough swap back to the 190 with out takin the carb off but I would eliminate one thing at a time before changing what was there... Know what I mean?

 

True, but with the larger air filter I felt it was needed. I was running the 190 with the stock sized filter and the 06 filter is WAY bigger. Either way if it gives me issues ill change it.

Still baffles me as to why I was climbing a hill and it shut off when I let off most of the throttle at the top and when I downshifted 2 gears quickly to engine brake it died.

 

Valves are good. Intakes slightly tight at .005 but still close enough to spec. Exhaust are good. Just the hot start I think being stuck open.

 

kinda sounds like what mine was doing when I had my motor all done up. Turned out I was too rich on the pilot and it was flooding the engine on idle.

either way I think you are on the right track looking at the carb.

Does it run better when cold but then crappy once hot? is there much difference when you pull the choke or hot start qhen idling?

Change that cable first thing then go from there I guess.

 

Doubt I'm too rich on idle or my main. Same pilot as before n only upped the main slightly. I think the hot start was stuck open n leaning everything out. But we're gonna see what happens next ride.

Doesn't seem to run better or worse with choke. Starts 1-2 kickS either way n

 

you've changed the airflow quite a bit with all your mods... so don't eliminate the possibility of having to change pilot size just yet.

Hope you sort it out with that new cable though and it's all that was wrong.

 

I hope so. Going riding tomorrow.

 

Think it was just the hotstart stuck open. Had zero issues today, 195 main seemed fine too.

 

Trust me its lean with a 190 based on the plug. I might dyno it later on but I doubt it's to rich. My 400 all done up ran a 175 stock carb

 

elevation makes a difference.

 

Wanted to add, that Im not some idiot who doesnt know how to jet stuff or work on this sorta thing. But others opinions are nice to have sometimes.

Im happy to report I rode all day sunday with zero issues. Pulled hard and didnt shut down at all.