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Showing results for tags 'floatheight'.
OK here goes... Picked up an 04 200 EXC few months back, needed some work to say the least, wont go into detail of all the things i've fixed on the bike just the current and most present issue I cant seem to fix... it is smoking IE blue smoke/lots of splooge to the point that at the end of a few hour's ride, it's out the tail pipe, running down the back and dripping onto the swing arm/rear break caliper and blue smoking quite a bit. When I first got it, it smoked more and smelled like shit. So first things first went to the carb, I live on the Oregon coast (elevation/temp reference) it's old dirty/stained but inside looks good, came with jetting pilot-45, main-178 needle: no idea what brand guessing stock in the 3rd clip, adjusted the float height due to it leaking gas when bike was upright no tilt with the gas on, Bought JD jet kit and running pilot-45, Main-185 and Needle is blue 3rd clip (JD's recommend specs for my bike @ my attitude). I have also replaced my Inner crankcase seal twice (First time I thought I messed up the O-ring so redid to make sure). I've rebuilt the top end/new piston (same thing) cleaned the PV, NOTE HERE that the PV has some issues, it seems to work fine but the screw that goes on top of the cylinder, down into the PV/flap would not come out preventing me from removing the flap to clean it, however it move's/ function's correctly, and has minimum clearance on both sides. One of the PV cover bolts that also works at the exhaust spring holder, was over torqued at some point (impact driver prob), or a result in a hard impact, the hole the bolt goes into is flailed/jared open a bit, not bad, not in the way of any function/ PV Gearing/hinge, it is not needed for that area to be air tight as their is also a breather that goes out of the PV so will not result in an "air leak" or loss in Top end PSI.... anyway... it's still smoking.... quite a bit.. now the bike itself rides fine I feel, the carb does puke gas when tilted over slightly/ hard to start (kick start) after flooded (like all bikes tho) I don't have any stalling/low idle issues outside of user error on clutch control. Honestly outside of it smoking as much as it does I would think nothing is wrong with it.. I have also tried raising the needle Clip to 2nd clip and it changed nothing at all, not even feel of the bike/response and have a new Spark plug I have yet to put on the bike. I have also "compromised" the crankcase Gasket (new one in the mail) while I was putting the Crankcase back on but that should do nothing with the exhaust just a little gear oil leak not relevant but throwing it out there. So I am at a loss... I've been toying with the idea of getting a Lectron carb... However... would hate to drop $400~$500 and the issue still persist, if it's a jetting/carb/float issue that would fix it and improve MPH/fuel consumption Or something with the PV? but I don't see the PV causing that much smoke/sploogee... I've ridden the bike normally/hard and nothing's happened but I don't want to keep pushing it and possibly clip the bike. Any ideas? "Oh help me 2 stroke community you're my only hope"
I'm new to 2T and mostly new to engines ... But I can fix things when I have directions! The bike started hanging on idle 20 minutes into my last ride. I'm a bit baffled by it. I have ridden these trails at this temperature and elevation before (approximately 400m and 4 degrees - within the stock specs for jetting I think), and I haven't changed anything on the bike - it's still stock. There's 10 hours on it. This sounds like an air leak to me but there was no other performance issues that I could detect after it started doing this (but I'm also a new rider - so I don't know what I don't know). The only issue that predates this is that it gushes gas from the float bowl overflow at the slightest provocation - I have reviewed the threads and see that this is a known issue so I will be tackling that. Any chance this wonky idle is related to the float height? Here's a quick video clip of what it sounds like:
I'm attempting to set the float height on my RT180 and somethings not right. The manual says Float height: 20 ~ 22 mm (0.79 ~ 0.87 in) 1) Hold the carburetor in an upside down position. 2) Measure the distance between the mating surface of the float chamber and top of the using a gauge. Problem is the closest measurement I can get is an inch and half and thats with the float mashed against the metal. Any one have any ideas?
I've got a 2005 YZ125 that I've performed a top and bottom end rebuild on 2 years ago. The bike has about 52 hours on the meter (which I put on during the rebuild), and I've been diligent about replacing the piston/ring every 20 hours. Engine-wise, the bike is all stock except for a set of VForce 3 reeds that I put on about 20 hours ago. The pipe and silencer are stock, and I've repacked the silencer on 2 different occasions. I run Pro-X pistons, Cometic gaskets, Klotz premix (30:1), 93 octane non-ethanol fuel, and NGK BR9EG sparkplugs. I sealed the cases with Yamabond 4. I've rebuilt the carb about 4 times using Outlaw Racing kits. It's never been jetted, and I've put all of the carb settings back to the original positions listed in the Yamaha FSM. I've been dealing with a frequent yet somewhat intermittent issue for more than half the time that I've owned this bike. When it decides to misbehave, it will begin idling high during hard riding, much like it's about to run out of fuel, and if it's still ridden hard, it will cut out -- often on the face of a jump, which is very scary. The bike will foul plugs from time to time if it's not being ridden at the track, and the plugs are always black, wet around the outside, and dry in the middle, so I assumed that the stock jetting was just a rich setting for safety (at the expense of the occasional plug), but figured that whenever I'm riding the bike hard, then perhaps a low float height setting in the Mikuni carb might be causing that intermittent lean condition any time the engine load depletes the low amount of fuel in the bowl. So I followed the FSM procedure of connecting a clear tube to the bowl to see the fuel level that the float valve stops it at. I inscribed 2 lines into the side of the carb for the 9.5mm and 10.5mm boundaries that the level is supposed to be in when the carb is vertical. Through a lot of trial and error, I was able to bend the float tab to a position where the fuel level satisfies that FSM spec. I thought the bike was fixed after a few hard test rides with no sudden high-idle nonsense, but unfortunately the problem returned once I actually had the bike off at a track. I just tested the float level again to see if the setting was repeatable after all the recent rides, and it looks like it's still dead-on to me -- or at least not low enough that I'd expect it to cause a fuel-starvation type of issue. See the pic below, and notice the 2 long lines I scratched into the carb body indicating the 9.5~10.5mm range. The small scratch up above is for showing how high the overflow tube reaches up. I thought I might have a vacuum leak, but I made a pressure tester and it was able to hold rock-solid for days. I also tested vacuum on the engine, and although it wasn't as capable, it still never dropped (raised?) back to atmospheric. I even tried heating the crap out of the engine with a hair dryer to see if thermal expansion would open up the leak and thus cause a change in either the pressure or vacuum tests, and didn't see a significant change. My VForce 3 reed setup has a gasket on top and on bottom, and I coated both sides of both gaskets with Permatex Ultra Black RTV (like I have seen recommended here on TT for this particularly troublesome model of VForce 3 reeds). Any idea what it could be? For reference, I've been riding the bike at 600~1100 ft. above sea level at different tracks around North Alabama.