Another Jetting Question + Hi-flo filter

[The_Paragon]

OK guys I've got a stock 2006 gsf. I never liked how it ran stock, idle hovered a bit etc. It had gotten a thorough carb clean, valve adjustment, and a new Hi-Flo air filter in Feb while it still full on winter.

So I re-jetted, 20 pilot, stock mid 60, and a 135 on top. Plus i drilled the fuel screw blocks and gave those 2 turns out.

Runs really great off of idle and pulls nicely to mid throttle. (thumbs up for sure!)
But when you get full throttle its too fat, wont pull past 8,000 and spudders. To confirm, I yanked the air filter out and it ran great all the way up to red-line. Actually ran really really well, and pulled hard. I was almost a bit impressed with the little 500.

Should I bother jetting back down to a 130 on the main, or do you think the Hi-Flo air filter is just pile of crap, and opt for something else?

[robfriedenberger]

I'd put a k&n in it and call it a day


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[Blueman]

I agree with putting a k&n air filter in it. But you shouldn't need to go back to stock jets. If anything u might be able to go up a couple more size in the main. Did you adjust the fuel mixture screws and idle adjust screws after you rejetted?

[The Buddha]

132.5 with stock type paper filter.
I wont do the K&N drop in, its dirty ... aka bad for engine life.
Cool.
Buddha.

[The_Paragon]

I set the fuel screws to 2 turns out. After drilling the plugs out it, I was surprised to see that they were set to 0 turns out from bottom.. To me, that was strange.
Idle was set and I was pretty pleased with the way the bike reacted off of idle and through mid range. It also returns nicely to idle after rev and requires way less choke time on start up. Thumbs up in my books.

So wide open throttle was the only issue at hand. It obviously should be content with the 130 jets back in. Maybe it would be happy with 132.5's ; after some thought, Its my girlfriend that rides it and shes pretty conservative with throttle use. WOT performance isn't on the forefront of concern.

Blueman- it obviously can't be needing larger mains because it already stumbles over the 135's.

Buddha.. not sure on the K&N being a dirty air filter? I've never had any bad luck with em. Though I've heard lots of controversy on that matter of whether or not they're good or bad for engine wear. I've no problem sticking with a paper filter. And besides, the K&N's are $62 on motorcycle superstore, and i don't feel like buying one, haha.

Thanks for the input guys!

[The Buddha]

When drilling out the mix screw caps sometimes the drill make contact with the mix screws and turn those. I'd say it was probably @ 2.5 or so ... if you doubt what I am saying, turn in those screws to say 1.5 and try running the bike ... It wont even run @ idle @ 1.5 and then once warm it will stick @ 4-5k and that is @ 1.5, let alone 0.

Cool.
Buddha.

[The_Paragon]

.... Damn I bet that happened, haha.  (face to palm moment)

[The Buddha]

However ... honda's of yore (pre 1985) have those weird ears on the heads of the screws that hit the rail rack ... those buggers were set to where they make contact with the rail rack in the direction of unscrew ...
They can be anything up to 3/4 turn off one to the other ... on a 4 cyl with 1.5 turns on the screws, you can see anything from 3/4 to 1.5 ...
No wonder you always saw plugs that could be anything from ashy white to pitch black ... and if you tried to vacuum synch the carbs, you can get completely off settings ...
The first thing people did was to shave those ears into nubs.
Cool.
Buddha.

[The_Paragon]

Ohh yeah, I remember those on my '81 cb650!

[The Buddha]

Buddha.. not sure on the K&N being a dirty air filter? I've never had any bad luck with em. Though I've heard lots of controversy on that matter of whether or not they're good or bad for engine wear. I've no problem sticking with a paper filter. And besides, the K&N's are $62 on motorcycle superstore, and i don't feel like buying one, haha.

Thanks for the input guys!

K&N lets in a lot more dirt. It may not matter if you have a lot of miles, like over 30-40k. But I'd rather keep upper end wear down in any case.
I am not for keeping it all stock mind you, I like pipes, I like rejetting, I just dont like tossing in things that hurt and dont give you any gain.
When going to K&N, whether or not you have high miles, just do lunch box ... That way atleast you get a few more hp.
Paper filter is to be cleaned and used, no sense having it dirty he he.

Cool.
Buddha.

[The_Paragon]

Cuz I knew you all were chompin at the bits to know...

I went back to the 130 main, Much better wide open throttle. Still acts like it wants to stumble just a little bit. Got a little more tuning to do on the pilot and fuel screws. Could these hi-flo air filters be that incredibly restrictive? I mean it runs like raped ape with the filter pulled out.

It still seems to stumble once in a while as you give it a rev off of idle. Sort of a mis-fire/ air puff that comes back through the air box. And maybe that will clear up as air temps around here warm up. But either way, the 20 pilot was a huge upgrade over 17.5, Its much happier. (maybe im expecting too much throttle response out of a 500cc air cooled twin.. as my main set of wheels is a Fuel injected 600 4cyl) 

[The Buddha]

Is the Hi flo filter paper - 1 sec let me google it -

Is it this -

http://www.ebay.com/itm/like/390813589062?lpid=82

Then I'd say its similar to the stock paper one.

2 turns indicates you're rich down low too. Can you check floats ?

Cool.
Buddha.

[The_Paragon]

Yepp, thats the filter.

I after work I'll get out and see if I can tune in the fuel screws a little better with temp finally touching 60 degrees. I set them at 2 just because I though it'd be reasonable, but never got to adjust them with the enging running. The weather here hasnt cooperated for anything yet.

I cant imagine that it'd be rich on idle with a 20 pilot jet and 2 turns out on the screws.

[The Buddha]

I cant imagine that it'd be rich on idle with a 20 pilot jet and 2 turns out on the screws.

It will be if your float is 3mm too high or more.
Cool.
Buddha.

[The_Paragon]

Well, thats one thing ive never looked at or adjusted.  I'd suppose theres a worthy thread on the forum about that.

[The Buddha]

Well, thats one thing ive never looked at or adjusted.  I'd suppose theres a worthy thread on the forum about that.

01+'es dont drift ... but someone may have mangled it to start with.
Cool.
Buddha.

[The_Paragon]

Well, thats one thing ive never looked at or adjusted.  I'd suppose theres a worthy thread on the forum about that.

01+'es dont drift ... but someone may have mangled it to start with.
Cool.
Buddha.

Drift? I'd say that I'm the first to ever be inside this thing. So i dont think anyone has ever done anything to this bike.

[The_Paragon]

So last night i tuned a little with the bike running. 3 turns out on the fuel screws and it seemed quite happy on idle and off idle.

Took it for a bit of a ride. About 50 miles or so. Still struggles a bit at wide open throttle.. and thats with the 130 jet. I'm going to try different stock replacement air filter.. maybe even buy a Suzuki oem.

[BockinBboy]

Not sure exactly what it is about the Hi-Flo filter, but many folks seem to have mixture issues with them.  Past threads ironically indicate that the 'Hi-Flo' filters are a bit more restrictive than stock.  Some people have gotten by fine with them though... perhaps they don't notice, or its just a quality issue with the filters 

- Bboy

[Atesz792]

I've also heared about the Hi-Flo problem of being a bit more restrictive than stock.
I wanted to go OEM, but my mechanic recommended the Champion stock replacement paper filter instead. Costs considerably more than the Hi-Flo, and still is a good bit cheaper then OEM here. I trust him, so I went ahead, and didn't regret it - filter looks quality made, and the bike breathes much better than it did previously - though whatever was in there was put in by the PO, so I'm not sure what that was.