Question about over heating

[Cali]

I picked up a 2000 Banshee.It was blown up,looked like it was runnig to lean.I had the cylinders bored to 040 it was o20 b4.It has T5 running stock carbs with 290 mains.Im pretty much at sea level here in Bakersfiel Calif.I put 340 mains in and have 330 & 320 aswell.I figured I start high and work my way down.It runs great on top,seems a bit doggy on bottom,but I hear thats normal.My proble is its pissing out the over flow when I get on it hard.I broke it in a few weeks ago just ridding it easy.But now its pissing out the over flow when i ride hard for a few seconds.I checked the ipeller and its fine.I did start it with the cover off for a sec and it does not turn at idel,untill rev it up.Is this normal?Anyone have any ide way its loosing water?If I shut her off It sounds hot.Check spark plugs are there a light tan color.

[GrMeyer]

Sounds like a head gasket leak. Is it the stock head? If so did you check the deck for trueness? You might have a warped head. Or a worse case the jugs might be warped. Are you sure it is over heating or it is getting pressurized forcing the coolent side to have to much presser and forcing water/coolant out? Also what pilots are you running? 27.5 and are you ported?

[firebanshee]

That impeller is gear driven, it is driven off the white plastic gear under your clutch side cover, so it should turn when the motor is running.

[HiRoller]

That impeller is gear driven, it is driven off the white plastic gear under your clutch side cover, so it should turn when the motor is running.

 

+1, your impeller gear is busted. You might also want to replace the impeller with a high volume billet one, your bike will run cooler with it.

[Cali]

Sounds like a head gasket leak. Is it the stock head? If so did you check the deck for trueness? You might have a warped head. Or a worse case the jugs might be warped. Are you sure it is over heating or it is getting pressurized forcing the coolent side to have to much presser and forcing water/coolant out? Also what pilots are you running? 27.5 and are you ported?

 

Im running stock pilots.It idles fine.I have a cool head with 20 doms.New rubbers etc

[Cali]

+1, your impeller gear is busted. You might also want to replace the impeller with a high volume billet one, your bike will run cooler with it.

I will pull the clutch cover off tomrrow and see if thats it.That does make sense.Thanks for the info guys

[Fullthrottle02]

Mine did about the same thing, when I removed my case, parts of the the plastic gear had broke off and fell into the bearing seizing it up as well.

[06specialedition]

While you guys are on the "impeller" subject what brand is everyone running?

[Chariot Performance]

We have two choices on ebay. A standard aftermarket design impeller (same as most other aftermarket impellers). We also have a deeper impeller "ultra" and it does a better job at equalizing the temperature through the cases and cylinder by increasing the flow rate. On most engines it does not lower the temperature more than our standard does at exit of the head which is fine. I am sure this will end up a debated topic and possibly a long thread after my next statement. I will pose the statement as a question. If an impeller lowers the temp throughout the cases and cylinders by equalizing the temp through higher flow rate but rarely lowers it at the exit of the head back to the radiator then what is being accomplished? My answer is that an impeller does not affect the heat made by the engine. The generated heat is the same but the way it is carried away is different. The largest advantage of higher flow rate is the more even dispersal of heat over the course of flow (the distance of fluid travel). Unless the difference in flow rate is extreme then right at the source of heat very little temperature difference will be noticed.

[Cali]

Pulled my clutch cover off and gear was fine.The litle dow pin that the gear rides against was gone.I noticed some light metal shavings in the engine case.Could that have been the dow pin?I have new barnett clutch & basket with about 20 minutes on it.

[Chariot Performance]

Pulled my clutch cover off and gear was fine.The litle dow pin that the gear rides against was gone.I noticed some light metal shavings in the engine case.Could that have been the dow pin?I have new barnett clutch & basket with about 20 minutes on it.

The dowel pin is necessary for the gear to turn. If it is an aftermarket impeller then it is possible the hole location for the dowl or the location of the c clip groove is wrong. If either is wrong then the pin could fall out or the washer will rub on the case causing problems. Three possibilities exist: 1)wrong locations as noted above 2)dowel not inserted when installed 3)bearing froze up and dowel rubbed to pieces till it fell out.

I would believe either 1 or 2. If stock then 2 is likely the culprit. If aftermarket then 1 is likely also. If the locations are wrong then the washer tight against the case would wear out the aluminum a tthe case and the plastic gear where it seats against. When the plastic gear wears then the dowel could fall out.