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Old 10-08-2018, 05:54 PM   #1
Miruri
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RSV4 Lost Power After Speedy Canyon Run

I have a fun one for all of you.

Two weekends ago I was riding Glendora Mountain Road with my better half leading. He twas taking it conservatively on the CBR, and by the time we got to the lookup/turn around spot my bike started leaking all of the water out of the overflow reservoir. In a panic, thinking the bike will overheat I turn the RSV4 towards the road and pin it back for a fun time riding around GMR's technical roads battling a running temp of 208-210 in first gear at high RPM's.

This past weekend I forgot to check this issue out, and I went back out to GMR with no additional water in the overflow reservoir. The bike ran fine, until I met up with a gentleman who does 1:55's at Chuckwalla and enjoys tailing after me through the canyon. We had a great run up and down, but after a short rest my bike felt like it completely lost all power.

I was curious if this could have been due to the bike's running temp which was 200-220 sitting, but it felt like the TCS was cutting power when I would roll on the throttle. I would have been convinced that was the issue, but I was going half my usual pace!

Fun story, I figured I would share. If you have ever experienced anything similar feel free to drop a reply. I'm going to go remove fairings now.
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Old 10-09-2018, 06:57 AM   #2
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Does the bike start?

Check the radiator to make sure you don't have any oil in it. Worst case you might of blown a head gasket.

Hopefully it was just that your temps were high and the bike needed a break.

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Old 10-09-2018, 07:53 AM   #3
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220 isn't a coolant temperature that'll normally cause engine damage.

Take a deep breath, drain the oil, coolant, look for problems where they may be intermixing, and get the issue determined and resolved. We're all fatalists in one way or another, and tend to believe the worst.

It's seldom "the worst case".
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Old 10-09-2018, 12:54 PM   #4
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Agreed with above (swapping the fluids) but if you felt it was something with the TC, check all your sensors. If it wasnít a persistent issue, and wasnít really completely killing the bike, it might be a loose connection somewhere, a wire that overheated, or just something out of calibration, maybe the TPS sensor or wheel speed sensors.

Try disconnecting the battery overnight so everything can have a good reset too.
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Old 10-09-2018, 02:30 PM   #5
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Quote:
Originally Posted by rgbeard View Post
220 isn't a coolant temperature that'll normally cause engine damage.
Absolutely. My VFR's fans don't even come on until 220, so hopefully it's nothing major.
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Old 10-09-2018, 05:56 PM   #6
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Canít speak for Aprilia reliability but on one of my last track days my 2009 VFR hit 255F. I was on the front straight at Streets of Willow when I looked down and saw the flashing temp gauge and immediately backed off the throttle and was able to limp back to put lane and let the bike cool down. The outdoor temp was 102+ the day that this happened. I thought I was just pushing too hard on a hot day, as the VFR is known to run a bit warm. Iím not sure how long I was in the 250+ range as watching the dash board while on the track isnít something I do often, I just happened to do it when I was flying down the front straight.

Turned out the main seal of the water pump failed and I was leaking coolant out a bit at a time from the weep hole, essentially ending my day mid afternoon. The bike never shut off on me though and I have since replaced the leaking water pump and have been good to go since. Have to say, I did keep my eye on the temp gauge the first few rides after I was back on the road.
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Old 10-09-2018, 07:46 PM   #7
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I have run my truck so hot it lost power so it is possible. Check out the cooling system fix any problem and run the out of GMR.
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Old 10-11-2018, 01:32 AM   #8
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I would probably start by draining the coolant, replace the radiator cap and thermostat and refill making sure to get all the air burped out.

Whilst drained if it’s accesible I would pull the water pump cover off and make sure everything looks as it should.
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Old 10-11-2018, 12:48 PM   #9
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You all are the best. I came down with an awful cold this past weekend and hopefully this weekend I will have some time to check the bike out.

Dustin did ride the bike on Tuesday through GMR with no issues. I did check the coolant reservoir and it was filled with no loss of water (weird). Providing my health improves it looks like I'll need to give the bike a good flogging to see if I can replicate the experience.

It is about time for the usual oil, coolant, change anyways.
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Old 10-11-2018, 12:49 PM   #10
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Quote:
Originally Posted by rgbeard View Post
220 isn't a coolant temperature that'll normally cause engine damage.

Take a deep breath, drain the oil, coolant, look for problems where they may be intermixing, and get the issue determined and resolved. We're all fatalists in one way or another, and tend to believe the worst.

It's seldom "the worst case".
Great response, thank you for the pointers!
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Old 10-11-2018, 12:51 PM   #11
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Quote:
Originally Posted by Pearl zx6 View Post
Does the bike start?

Check the radiator to make sure you don't have any oil in it. Worst case you might of blown a head gasket.

Hopefully it was just that your temps were high and the bike needed a break.

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I really am hoping it was just the bike riding a bit hot.
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Old 10-15-2018, 12:32 PM   #12
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I had something happen with my RSV4 minus the leaking all of the water out of the overflow reservoir. Turned it off and then back on. Problem solved. Never figured it out. Gota love Italian.
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