Overheating..... clogged carb? Water pump?

sirsumm · Mar 27, 2006

Perhaps one of you can help me diagnose my newest problem with my 600. I was out for a short ride up the road with the beast when it backfired and lost all power. It didn't die, but I had virtually no bottom end, and no mid range. When I opened the throttle it came on in the top end and just about dumped me. As I limped the beast home I noticed that it was getting hot. I shut it down,, the radiator was still near full, I kicked it over, and it started. It appeared to be circulating coolant still, but I am not sure how much it was circulating before this all happened. I was thinking that either I lost my water pump, or I got something stuck in my main jet. Any ideas? I am going to take the carb apart tomorrow and check it out once things cool down all the way.

LINEAWEAVER · Mar 27, 2006

Sounds to be lean on fuel.
Insure proper delivery of fresh fuel and a clean intact carburetor.
Dale

sirsumm · Mar 27, 2006

Thnaks! That goes along with my suspisions. It's a pain to start most of the time, and I was suspecting that it may be running lean.

Ady · Mar 28, 2006

Hiya
Yup, I agree with Dale
Sounds like float bowl not filling due to petrol blockage.
You know when ya run out of juice .... them symptoms !!

Cleaning carb & fuel lines should do it, as i presume it was all running ok before.
Regards
Ady

Stiff_Bubba · Mar 28, 2006

I'm gonna go in a different direction than the other (not because I think they are worng, but just to cover all) switch out our spark plug. If it runs like crap and has no bottom end and then picks up, you may be arcing incorrectly. Just a thought from a different point of view.

sirsumm · Mar 28, 2006

The plug is a good thought too....I change my plug all the time (hard starting issues). Prehaps my crush seal is leaking, causing me to run lean.

doctorcorey · Mar 28, 2006

Hey, man, just a thought on your water pump. I once had a 500 that seemed to run a little hot sometimes. It always had a lot of hiss whenever I'd open the radiator cap. We took it to Barstow at the height of the summer heat and rode the heck out of it at that elevation for hours just climbing hills and blasting desert washes. Months later, when I tore it down for a new piston, I discovered that the water pump impeller was melted(!)and in fact my Berg was steam-cooled after all. Tough motorcycle! Anyway, your problem sounds like fuel -starvation:clogged jets, water, or float level. Also check carefully for a massive vacuum leak. Oh, yeah, and make sure the flux capacitor is fluxing enough! :roll: :roll: :roll: good Luck, DC

sirsumm · Mar 28, 2006

Ok, this afternoon I was able to clean the carb......it needed it. My hard starting problem went away. I was excited thinking that I solved the problem. I didn't make it 200 yards from my house when the same thing happened. So I went home and tore the tank off thinking that the filter in the petcock was plugged. It wasn't. I started to look at the fuel pump. It looked ok but when I blew into the "out" side I was able to blow bubbles in the tank thru the "in" side. I am thinking that the pump is not delivering enough fuel to the upper part of my tank for the bike to run properly. Tomorrow I will top off the tank and see if it runs correctly. At the very least I got the thing so that it doesn't take 30 kicks to start. I was starting to look funny with one large leg.

sirsumm · Mar 31, 2006

It was not the fuel pump. I am not sure where the fuel restriction is now. It's almost gotta be something with the floats, or the needle and seat. Mabe I will just slap a Mikuni on.

fryguy · Mar 31, 2006

Could it be a ripped/weathered intake boot? Rather than not enough fuel, maybe your problem is too much air? poe tae toe, poe tat oe :?:

sirsumm · Mar 31, 2006

Prehaps it could be that, but I have my doubts. It started doing this in the middle of a ride. I will shoot a little starting fluid around the intake this weekend just to be sure though.

wildbill · Mar 31, 2006

Check the gas cap vent to make sure it is open. How new are the fuel lines? They can go bad and block flow. Check the carb vent lines, make sure they are open. Make sure the plug wire to coil is tight along with the plug cap being on tight. Hope this helps.

sirsumm · Apr 6, 2006

The rain finally let up here enough to take the carb off and look more closely. Here is the only thing that I see that may be a problem. My needle and seat appear to be worn, but not on the cone. It looks like the thing over the course of 11 years of vibration has worn the OD of the needle, which is allowing it to bind when the float arms raise it. Has anyone else ever heard of a needle and seat wearing this way? This would be a first for me. I did find a used Dello here in town for $50, I am going to buy it tomorrow, and see if that solves my problems.

wildbill · Apr 6, 2006

Float valve and seat costs $ 11- $ 13 and they are easy to replace. I had to replace one in a VHSB 38mm carb. You had better check the one you buy for wear as well or you might be in the same fix with 2 instead of 1. There are places on the web that sells parts. Give them a look. Hope this helps.

sirsumm · Apr 6, 2006

The thought did cross my mind.....actually I was planning on replacing it, but the other carb has less wear on the slide than mine, so I was thinking I could "upgrade" with the other carb.

bergdaddy · Apr 6, 2006

BE SURE TO check the WATER PUMP IMPELLER. those models were famous for melting the plastic impeller..you can use the old style ktm bit and with just a little bit of filing the edges off ..and it will last much longer..

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Overheating..... clogged carb? Water pump?

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