Even with a PCIII, just cant get rid of the "trailer hitching"

[woppini]

Dunno, my bike just wont cooperate all that well with this new exhaust and map. Custom map, downloaded maps, messing with my own maps, just cant seem to get rid of the trailer hitch. Bike pulls hard, no surging, but when I find that spot of steady throttle i can feel the hiccups. Mostly down in the 2500 to 3500 range. I guess I can go richer, but my map is as high as 40% higher than richest maps available. Feel like putting the stock exhaust cans back on , but wanted the look of left, right cans. I think there just isnt enough back pressure. I installed the DB inserts thinking that would help, but didnt do much. This is deff a mapping issue and not a misfire. Repaired an exhaust leak, and plugs look good. Show slightly on the rich side.
05' S2R800
Marving slip ons
PCIII
Stock otherwise

[DarkStaR]

Describe:  "hiccups"?

How did it run with out the PC3, or with a zero map?

Sounds like there is something else that's wrong.

[NAKID]

Sounds to me like he's describing the "surging" the newer bikes with O2 sensors were dealing with. Odd since the 05 800 doesn't have an O2 sensor...

[ducpainter]

Bad valve guides can cause surging.

[woppini]

Describe:  "hiccups"?

How did it run with out the PC3, or with a zero map?

Sounds like there is something else that's wrong.

Without the map it ran really bad.. popping in the intake at times under accerlation, surging at cruising speed. Once the map was installed, it ran MUCH better. All this started when I put the slip ons on. I should maybe put the old exhaust back on to verify thats the problem. I checked the valves at 6,000 and the guides seem good.

[corndog67]

How do you check the valve guides without pulling the valves out?

[woppini]

How do you check the valve guides without pulling the valves out?

I took off the timing belts, made sure the open and closers were unloaded, then attempted to rock the stem side to side

[EEL]

Some critical info would help

1) Mileage

2) valve adjusts done?

3) any upgrades? ie flywheel?

4) Whats the mileage / condition of your chain and sprockets?

[ducpainter]

I took off the timing belts, made sure the open and closers were unloaded, then attempted to rock the stem side to side

You really can't tell with the valves fully closed.

You'd have to remove the closer shim and check it open.

[woppini]

Some critical info would help

1) Mileage

2) valve adjusts done?

3) any upgrades? ie flywheel?

4) Whats the mileage / condition of your chain and sprockets?

1) just turned 8,000 miles
2)yes, valves done at 6,000- all within specs
3) no flywheel up grades except 14 tooth counter sprocket
4) chain and sprockets seem ok, lubed, no kinks, tension is fine.

[EEL]

I'm betting its valves. Sounds like you did them yourself. Best to double check closer clearance again. If you didnt have to replace any, you might be due.

[woppini]

hmm.. I'll check out the valves again. I have some time today, so maybe I'll put the stock exhaust back on, and no map. Start from square one and see how it goes.

[EEL]

A lot of times aftermarket systems will amplify existing problems your bike may have masked with the oem setup. Try to get the valves to old school specs on the closers (zero tolerance).

[woppini]

A lot of times aftermarket systems will amplify existing problems your bike may have masked with the oem setup. Try to get the valves to old school specs on the closers (zero tolerance).

agreed... infact It wasnt until I washed the bike and started it up when I saw an exhaust leak at the header slip joint. Its been like that along time because I wondered why the oil cooler braided lines were dark in that area. Now I know... exhaust leak. I'll fix that first, massage the map a bit in the lower end. Iam pretty confident those valves are dead on. But I'll give them a check.

[EEL]

Exhaust leak is definitely a first priority.