Low RPM run quality of 2020 800 C-Tec - HCS Snowmobile Forums

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Old 02-01-2020, 09:43 AM   #1 (permalink)
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Default Low RPM run quality of 2020 800 C-Tec

Since new felt the sled ran a little rough at lower rpm's (below 6000)
Going by sound it was hard to notice but you could feel the difference.
If idling around at a steady throttle, when the sled hit 6000 it would noticeably increase in speed and rpms.
Sled ran good throughout the rpm range, just hard to hold consistently in that 6000 rpm range

Now have over 1000 miles on the sled and low rpm run quality seem to be getting worse.
The engine now sounds rough at lower rpm's and when coasting to a stop you can actually feel the sled chug

When out on the trail the sled runs good
Anyone else notice the same?
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Old 02-01-2020, 10:19 AM   #2 (permalink)
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6000 is when the power valves open fully, you may want to check your cables for adjustment spec. the spec is 36.5mm +or- .5mm

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Old 02-01-2020, 11:10 AM   #3 (permalink)
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Quote:
Originally Posted by oldcrow View Post
Since new felt the sled ran a little rough at lower rpm's (below 6000)

Going by sound it was hard to notice but you could feel the difference.

If idling around at a steady throttle, when the sled hit 6000 it would noticeably increase in speed and rpms.

Sled ran good throughout the rpm range, just hard to hold consistently in that 6000 rpm range



Now have over 1000 miles on the sled and low rpm run quality seem to be getting worse.

The engine now sounds rough at lower rpm's and when coasting to a stop you can actually feel the sled chug



When out on the trail the sled runs good

Anyone else notice the same?
I've only managed about 350 miles but mines the same as yours. Very stumbly down low but good over 6k rpm.

^^^^ says valves are open at 6k but I thought its 7k, I dont see this as a power valve issue.

I will likely go the aftermarket flash route once the season is over to clean it up all around.

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Old 02-01-2020, 02:28 PM   #4 (permalink)
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Might be loading up, fouling plugs, clears out at higher RPM. Try the EIX models of BR 9 series, as they harder to foul. Valves open at 7ish RPM
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Old 02-02-2020, 07:40 AM   #5 (permalink)
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Agree with the low rpm issue. I have a Riot 800 that rumbles in that 4600-4900 range so it’s happening every time I let off the throttle coming into corners, etc and results in an exhaust drone type sound
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Old 02-02-2020, 08:42 AM   #6 (permalink)
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I agree, power valves open around 6900 rpm

I'm thinking this is just a first year tune issue and given a little time they will get it cleaned up.

Oil consumptions seems a little high.
They low oil light will start to flicker around 250 miles which is about 2 quarts.
My 18 800 was better than this and I could go 500 miles on my 14 600 before the low oil light would flicker

Riding at an aggressive/smart trail pace we can easily go around 130 miles on a tank of fuel before fuel light starts to flicker which takes about 9-10 gallons to fill
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Old 02-02-2020, 12:12 PM   #7 (permalink)
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Mine also runs rough around 5K RPM. It started to break up at higher RPMs but found my throttle switch wasn’t quite working properly. I applied a small amount of lube to the throttle and now just the low end glitch is present again. Hopefully Cat will get us an update on the fuel map to clean it up. Guess they will leave it up to the consumer or aftermarket to straighten out the clutching. Anyone tried a kit they really like to pull down rpms and speed up back shift.
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Old 02-02-2020, 12:46 PM   #8 (permalink)
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I'll add a quick cut and paste I've noticed about the sound and oil consumption.
I keep a running review going on the comparison between machines.


"2. Sound and feel. The changes are subtle. Some riders may not notice. The 2020 has a low speed growl. Some is related to the clutching. It also has a different tone/feel, that you notice on the low end up through upper mid range. It is kinda like the old big bore twins. There is more feeling the motor working when it pulls hard.
3. Fuel and oil. Can't figure this one out. (Maybe this machine is an oddball.) The '20 started out using less fuel than all the other sleds. The fuel consumption has leveled off and is very close to stock 18 machine. Oil usage was obviously high during break in hours. It still uses a lot of oil in comparison. The 2020 oil light comes on about 30-40 miles before the 18 with hard riding. I honestly thought the sensor might be wrong and verified the oil levels. This '20 just uses more."


I have not figured out exactly what is causing the difference in sound. I can verify that it does use considerably more oil.
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Old 02-02-2020, 02:09 PM   #9 (permalink)
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My 18 runs messed up too. Doesnt idle very well, has a delay in the throttle from a roll. Hopefully its just a idle air control thats not functioning correctly.
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Old 02-02-2020, 04:01 PM   #10 (permalink)
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Can someone confirm if the low end issues still exist with the Precision flash ?

I have heard that it has gained some low end crispness with the flash.
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