[gripitandripit111]

This is my first post here... found this place very helpful in the past so here goes! So today I went riding out at three palms out in conroe Texas. It was a hot one today. Me and a friend rode for a few hours. I was on lap 5 when my bike seemed to bog and hesitate a bit and I thought nothing of it. I finish the lap and pull off to head back to the truck. The bike bogs and dies. I kick and kick and kick and nothing. Oil level was low but between the half way mark on the dipstick. Not alot of smoke but enough to worry me. when I removed the dipstick smoke flowed.out of he fill hole. I changed the airfilter before riding and topped off the transmission fluid. Idk why I didn't check the motor oil. But when I got home after washing the bike I changed the motor oil and oil filter and checked for metal shavings. Luckily it had no shavings. I then tried to start the bike. It acted like it wanted to start and cranked over a few times but when I applied throttle nothing changed. I had my mom pull me behind my truck. and it started but wouldn't stay running under load or idle it wouldbog bog and die. Now if I held it at about six grand (wc tach and hour meter) it would [/img]

[gripitandripit111]

It would be fine all the way up to the Rev limiter. The motor had a complete rebuild crank topend the whole nine yards. It has 13 hours on the rebuild now. My radiators were almost empty. I think it has a leak I hear a high pitched whistling sound when the motor is comoletelty warmed up. Think it could be just piston rings? I'm.going to pull he jug but havent yet. I will in the next couple days.

[riddler9]

Based on your post, I would not run to the engine looking for problems. When things break you get a bad noise and metal shavings. A bog and die is usually air, fuel, or electrical.

Start with the basics. Solid spark (not intermittent), plug is tight and not oil fowled, good spray from the carb, all paths and jets in the carb are clear, AP and float are good.

[Aussiecrf230]

My first question is where did the coolant go?
Was the bogging actually overheating and the rings and piston grabbing the bore?
How is the compression now?

Sounds like the oil was doing your cooling for you.

With the oil changed, top up the radiators and follow what riddler9 suggested for a start. Always do the basics before pulling things apart or you may never find the true cause.
Hope it goes well but your description doesn't bode well.

[gripitandripit111]

Thank you both for a speedy reply! I'm not sure were the coolant went its not in the motor. Transmission and engine oil were not milky. Either this hot Texas weather is causing the rads to boilover or i have a tiny pinhole in one of them. I will start with the basics like u said. I hope its not the stator I replaced one a few hours before the rebuild. I will write a follow up on what I find. Thanks again!

[JimDirt]

When you say it was smoking , was it white smoke or blue smoke ?? , does it smell sweet at the muffler ??(anti-freeze smells sweet) , if so then i am going with a blown head or base gasket (the fluid can go right out the exhaust without showing up in the motor or oil) , most everything you said is a sign of carb or electrical issues except the water missing , whistling could be a carb leak , squealing would indicate bearings or oil starvation (cam bearings ?)but you should see shavings in the filter , so without hearing it first hand , its hard to diagnose noises

What concerns me most is the water loss (does the plug look rusty or like condensation is on it ? , a plug wont fire with water/coolant as a ignition source , hence the bogging/lack of power till high RPM's when you have enough fuel to compensate for the amount of water drowning the plug), if it was fine before the ride and low after , then that is a sign of a gasket failure , you need to do a Leak Down test (not a compression test), if there is a gasket failure it will show up , as well as any valve issues

[gripitandripit111]

The white smoke cane out of the engine oil fill hole. Not a lot but enough to worry me. The exhaust smells a Tad sweet but it has alwats smelled like that even before the rebuild. I hadn't checked the radiator fluid level in quite sometime. I just got done cleaning the jets by rotating the Carb while its still on the bike. Jets were clean and so was the bowl. I replaced the plug as well. It kicks over like there is plenty compression and will start for about five "thumps" then die and does it over and over. Giving a twist or two of throttle does nothing. I will go ahead and pull the Carb off and do a full cleaning.

[JimDirt]

Before you pull the carb , pull the airbox (by lifting the subframe)away from the carb so you can see the slide , then (with the fuel valve on) twist the throttle and watch for the squirt , 1st make sure it does squirt , then make sure the squirt does not hit the slide but just barely misses it , this will give a indication of the accelerator pump condition

If you have not checked the radiator levels , in a while it most likely just puked out the overflow and lowered the level over time

When you do get it to start is it with the choke on or off ?? , when you get it to run does it run better with the choke on or off ?? , does it do this with the engine hot or cold or both ??

If you tried to clean a jet while its still in the carb if there was dirt all you did was push the dirt up , then the dirt goes right back where it was after you remove the cleaning tip , you HAVE to remove the jets to clean them (hopefully you are using the correct Jet Cleaning Tool), if you are unsure , just replace the jet , also make sure the O-Ring for the Fuel Screw is intact , it should be screw,spring,washer,O-Ring , in that order , before removing the fuel screw , count the turns by going in(clockwise) and count how many turns it was out

With your water issue being a non issue it seems , then i would concentrate on clogged jets and/or a bad AP causing the issue

Completely eliminate the carb/fuel as a cause before moving on to electrical , this will eliminate a mis-diagnosis

[gripitandripit111]

Thank you for your help but I've diagnosed the issue. BLOWN HEAD GASKET. After being pulled behind the truck and running for just long enough to warm the cylinder being frustrated I put it up. The oil is milky now that I just checked. It must have blown all the coolant out of the rad's or just been low to begin with BC the oil was not milky after I drained the oil yesterday with the rads being empty. Now with the rads full it is enough to push past the gasket into the oil. What a dissapointment. Gotta pull it all apart and hopefully my cylinder and piston aren't trashed.

[JimDirt]

Well good that you found the issue (which was my first guess as to what it was from your description) , but sucks that is what it is , keep us posted on your findings

[gripitandripit111]

I will be back riding asap! I will keep you all posted on the teardown and how things turn out. Thanks again for everybody's help.

[riddler9]

Glad you got it figured out. I must have jumped over your second post about the coolant

[gripitandripit111]

Okay so I have replaced the head gasket and all the fluids. Put it all back together. Kick kick kick and will crank.over like it wants to start about three or four times with the choke off. Any addictional throttle and it makes a bog sound and does nothing. With choke on it doesnt want to.crank.at all. My hot start is securelly in place. I triple checked tdc and its dead on. My spark is strong and blue in color. Compression feels strong. I didnt clean the carb but this will be my next thing to do seeing as ik running out of options. Any other ideas fellas?

[gripitandripit111]

My brother just pump started me behind my truck. It will hold idle for at about 5 grand. anything past half throttle and it will bog and start to die. It wont idle it just dies. The pipe got red hot about five inches from the head so I shut her down. I'm going to.change the oil. I'm still trying to UN milk it.

[gripitandripit111]

My brother just pump started me behind my truck. It will hold idle for at about 5 grand. anything past half throttle and it will bog and start to die. It wont idle it just dies. The pipe got red hot about five inches from the head so I shut her down. I'm going to.change the oil. I'm still trying to UN milk it.