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Slight degradation in performance - GRiSO 8VSE

ohiorider

ohiorider

Cruisin' Guzzisti
Joined
Apr 8, 2011
Messages
174
Location
Hudson, OH
Sorry for the book-length note!

I took delivery of my 2012 GRiSO in late June of 2012, (set up by GuzziSteve) and she has been a strong runner with tons of torque in ANY gear from 3000rpm to redline. I rode her approx 4400 miles in 2012. Put away for the winter after (a) changing oil and filter (b) adding Stabil and filling with 93 octane fuel.

This spring, she started right up without issue, but I've noticed that the bike seems to have lost some of the brute torque from 3000rpm, which it doesn't regain until 4000rpm. Not really poor performance, more like how the original 8V Griso performance was described by the moto mags ... 'really comes on at 4-5k rpm.' Also, she seems to run slightly rough when I'm running in lower gears with nearly no throttle load ... say in traffic at 30mph in 3rd gear (3000rpm). To eliminate this, I will drop to 4th gear. This places a slight load on the engine, and it seems to smooth out. It feels more like an engine with a race cam vs a 'miss', and giving some throttle seems to smooth it out.

I've made zero ECU mods to the bike, and this 'flat feeling between 3 and 4k rpm began before I removed the fuel tank (for the purpose of replacing the metal/plastic fuel filter .... which I didn't, since the bike had the all-metal Mahle filter.) At that time I also removed the blue and orange pressure valve from the tank vent line, since it seemed to be causing excess vapor pressure in the tank.

I did notice a slight aroma of burnt fur on initial ride which went away (could it have been mouse in the airbox? .... should have checked when tank was removed.)

I have a copy of VDSTS that is compatible with both my bikes' Marelli computer (1200 Sport and Griso 8V), but aside from resetting the TPS after TB balancing, I have no knowledge of its other capabilities.

Other observations:
- exhaust pipes are still golden, not burnt. Just a few brown spots that may polish clean.
- there were no ECU or DSB errors when I checked them a few days ago.

What to look for?
 
I did notice a slight aroma of burnt fur on initial ride which went away could it have been mouse in the airbox?
Yeah, Id say check your airbox

Read this with a Scottish accent;
If thats a moose I'd hate to see ya (pussy) cut.
 

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It didn't smell like 'baked in the airbox' mouse, more like 'braised on hot engine parts' mouse. Whatever or wherever it was, it stunk!

Re the injectors, I picked up a small bottle of injector cleaner at Advance Auto, and will mix up a batch of 93 octane and this mystery liquid. It appears to be a reasonable place to start.

Aside from the issue I've described, the bike runs good. I almost don't want to disturb the TB balance and perform the mandatory TPS reset .... at least until I give one tank of treated fuel the opportunity to clean things up. One thing at a time.

EDIT: I love the placebo effect! I added four oz of SeaFoam gas treatment (says it'll clean dirty injectors), to two gallons fuel in the bike tank, held the front brake on, and shook (didn't stir) the bike back and forth to thoroughly mix the cocktail. Quick ride to the gas station a few blocks away to fill up with another two gallons. After 50-60 miles, my mind says 'yes', she runs better! After another 50 miles, I'll need to install a bumstop saddle just to hang onto the GRiSO :mrgreen:

EDIT2: I removed the airbox cover and found nothing to indicate any little critters had been inside.
 
maybe it was some leftover winter blend gas. My car seems to be sensitive to this. Also maybe check the tightness of the headers, mine loosened up between 4-8k. I put the O2 sensor dudad to cure my lower rpm weirdness.
 
grimace said:
maybe it was some leftover winter blend gas. My car seems to be sensitive to this. Also maybe check the tightness of the headers, mine loosened up between 4-8k. I put the O2 sensor dudad to cure my lower rpm weirdness.
Click to expand...

Hi Grimace, just wondering what is a 02 sensor dudad ? :dry:
 
grimace said:
maybe it was some leftover winter blend gas. My car seems to be sensitive to this.
Click to expand...

think you nailed it, CA has ethanol gas year round and my bike always runs better when I get non-ethanol fuel in Oregon. I've been using Lucas Fuel Treatment, not sure if it helps, but I use it anyway when the bike gets less use during winter. MPG goes up about 20%.

the O2 gizmo is an O2 Optimizer or Fat Duc - maybe others. There are a bunch of threads on the subject here on GT.
 
I'm late to the party here, but without a doubt, fuel additives like Stabil certainly numb the performance, and Winter blend fuels certainly don't help either. It sounds like you have it figured out, but for sure run another tank through and I'm sure it'll be 100% again.
 
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