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Chansharp

new radiator and coolant change but is it flowing?

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hey i had bent the left side of my radiator so i replaced it and filled it with engine ice coolant..started it up and felt the hoses and didn't feel anything moving i could pretty much squeeze the tube together..no sure if thats normal..anyone have any insight? does it only pump under acceleration?

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They don't pump very well at idle, but they should very visibly move coolant.

With the bike cold, there isn't very much reason not to lift the cap off and just watch it move around. Just be sensible about how high you rev it. You should see it move, and be able to see movement from the left side to the right. If not at all, you may need to check the pump to see if there's a problem.

Beyond that, with the system filled, the thing to look for is heat at the top tank on the side where the hose from the head connects to the radiator. That's hot water from the engine, and if it circulates right, you'll be able to follow the heat on the radiators as it moves down toward the pump.

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Ok so here is was I observed I started the bike and lifted the cap and was visibly more full and would fluctuate up and down with the throttle. It was actually getting more fluid not just bouncing around from the vibration. I couldn't really tell if it was moving to the left radiator but I'd imagine with the cap off it doesn't building up pressure to push it over there. Wen I turned the bike off it went back down to normal level. Does that all sound like its working correctly?

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well good news went riding tonight and both radiators got quite hot but not too hot i wouldn't think..even after a new piston,rings,pin, surclips, both intake valves and all new stem seals it is still quite hard to start when its hot like if i kill it during a race. basically the only thing i didn't replace is exhaust valves and springs . It seems to start much easier if i open the enrichner knob? ( 2010 yz450f) not sure what would be wrong maybe just the mapping if the knob makes it start? any ideas? 


Does the top tank get warm as the engine heats up?

yes they were both hot at the top.. above the actual cooling fins

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 It seems to start much easier if i open the enrichner knob? ( 2010 yz450f) not sure what would be wrong maybe just the mapping if the knob makes it start? any ideas? 

yes they were both hot at the top.. above the actual cooling fins

 

It's circulating then.

 

The '10's do like to use the "cold start knob" even when warm, but it doesn't enrich anything.  Enrichment is handled by the ECU based on input from the coolant temp sensor.  The pull knob just adds more air to raise the idle speed.

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I guess I'll just get used to using it then. Just a bummer seeing everyone else kick their bike right back over lol

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Also make sure idle speed is correct... That also helps with starting.

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