When are the stock reeds not good enough?

[2Smoker]

Hey,

 

I finally got my bike put all back together, and the carbeurators are pretty tuned. My mods are:

 

Bored out 20 over stock with wiseco pro lite pistons

Head planed 15 thoudandths of an inch

Ported and polished intake/exhaust

Reed spacers

Modified air box with pro design filter

 

Running at sea level elevation in 15-25 celcuis weather.

 

I just got it bored out, ported and head planed.

 

I was running a 260 main and a 27.5 pilot. My pilots are fine the bike will idle no problem its perfect there.

 

I was running really lean with a 260 main, so last night I bought a 280 set of mains and a 320 set of mains. Well I was going to start with the 280s and then move to the 320s if it was still lean (those jets were all the dealer had) but I accidentally installed the 320s and after I realized it it was too late so I said the hell with it i'll try the 320s.

 

Well I took the bike for a run, no bog at all topped out and good throttle response, it really hauled. I went on a straight stretch for a bit wide open, shut the engine off and checked the plugs.

 

They both weren't exactly white, but they weren't a darker tan color either. I don't want my bike running that lean for god's sake anyways... I just rebuilt my whole engine.

 

Now I called a shop I know and was going to get them to tune my carbs up, and told them about jumping to a big main like that and still running a little lean. They told me that it's because I am running stock reeds still and they can't handle that much fuel going to the engine.

 

Now before I spend more money on reeds, how do the stock reeds hold up? Do I need to keep going bigger with my mains or buy new reeds. They told me it doesnt matter how big I make my mains the stock reeds will restrict the fuel and I will have a lean problem until I get better reeds. Is this true?

 

Another question - I have a clymer manual and I'm sure alot of you guys here have one too. If you look at the page where it has all of the pictures of spark plugs and shows the one that says perfect jetting condition - doesn't that look a little white to you? I mean the freakin plug tip is white. And the picture is black and white so it's hard to tell. Does anyone have a good plug guide on the internet that has color photos?

 

 

Thanks

[PUSH THE THROTTLE]

I've never heard of reeds holding you back. I would go richer on the carbs.

[kenr74]

Same here. I'm running 350's and am a little rich. It sounds like they just want you to spend more money.

[2Smoker]

Yeah that's what I thought. I just thought aftermarket reeds gave you better throttle response. I am going to jump to a 340 or a 350 and see what it's like. Better to be a little rich than a little lean.

[Capone]

From the times I've talked to Vito's, (which is alot) Porting, Polishing, and Getting headwork you should seriously jet up, 350 +

[Banshee~]

I think the plug's color should be paper sack brown

[Justintoxicated]

after your ported and have larger carbs it is a good idea to replace the reeds to increase fuel and air flow. I put in V-force 2's and the bottem end is nice and snappy, they look like they can flow 2x the amount of fuel and air as the stock (Look, but probably don't flow that much but definately more), which is not necessary if your running stock carbs and motor.

Edited September 14, 2004 by Justintoxicated

[Banshee0028]

Hey,

 

I finally got my bike put all back together, and the carbeurators are pretty tuned. My mods are:

 

Bored out 20 over stock with wiseco pro lite pistons

Head planed 15 thoudandths of an inch

Ported and polished intake/exhaust

Reed spacers

Modified air box with pro design filter

 

Running at sea level elevation in 15-25 celcuis weather.

 

I just got it bored out, ported and head planed.

 

I was running a 260 main and a 27.5 pilot. My pilots are fine the bike will idle no problem its perfect there.

 

I was running really lean with a 260 main, so last night I bought a 280 set of mains and a 320 set of mains. Well I was going to start with the 280s and then move to the 320s if it was still lean (those jets were all the dealer had) but I accidentally installed the 320s and after I realized it it was too late so I said the hell with it i'll try the 320s.

 

Well I took the bike for a run, no bog at all topped out and good throttle response, it really hauled. I went on a straight stretch for a bit wide open, shut the engine off and checked the plugs.

 

They both weren't exactly white, but they weren't a darker tan color either. I don't want my bike running that lean for god's sake anyways... I just rebuilt my whole engine.

 

Now I called a shop I know and was going to get them to tune my carbs up, and told them about jumping to a big main like that and still running a little lean. They told me that it's because I am running stock reeds still and they can't handle that much fuel going to the engine.

 

Now before I spend more money on reeds, how do the stock reeds hold up? Do I need to keep going bigger with my mains or buy new reeds. They told me it doesnt matter how big I make my mains the stock reeds will restrict the fuel and I will have a lean problem until I get better reeds. Is this true?

 

Another question - I have a clymer manual and I'm sure alot of you guys here have one too. If you look at the page where it has all of the pictures of spark plugs and shows the one that says perfect jetting condition - doesn't that look a little white to you? I mean the freakin plug tip is white. And the picture is black and white so it's hard to tell. Does anyone have a good plug guide on the internet that has color photos?

 

 

Thanks

I have almost the exact same problem..I went from a 260 main running "fine" then tried bigger mains. I tried 300's first, it ran ok for 1-2 mins, then nothing but bogging and died. Next was 280 and pretty much same thing. I did put in a pair of Vforce 2's and removed the airboxlid but it still bogged and seemed too rich to me. Perhpas there is a diff in the manuf of the mains? I have stock carbs and Mikuni mains I think....Anyways I am going to verify the plugs (color/oil) and try to crank it up again soon.

 

Any advice?