pipe or jetting, maybe reeds?

[1azshee]

Here is the problem, from quarter throttle to around half throttle it pulls like a ported banshee should, but from around half to full throttle it is real flat not much left. I wolud like to get your opinions and solve this problem, could it be my pipes? jetting? reeds? Whats your thoughts.

 

Setup:

just had my motor rebuilt and ported by a well know builder here in AZ, he trued and welded the crank, new top end, re-shaped and milled the stock head, and dune port. advanced the timing 4 deg. builder told me to setup my stock carbs with #30 pilot, #380 mains and needle clip set on second clip from the tapered side, reeds are stock and I'm running the toomey t4 pipes, 13/43 gearing. Air cleaners are clamp on K&N no airbox. mix is 32:1.

Elevation in AZ is around 1000 ft do 90% of my riding at Glamis.

 

Thanks in advance

AZshee

[bigboybanshee]

If you are ported then you should really consider getting bigger carbs. That could be a large part of your problem, I'm kind of surprised to hear your builder suggest you still run those stockers I would recommend you get a better performing reed system though, some v-force 3's would make a nice difference over stockers

 

I don't thing your pipes or reeds are causing the problem though, it seems more like a carburation problem.

[locogato11283]

sounds a little rich to me..it shouldnt flatten off that bad..have you checked the plugs? 380 main is pretty f**kin big for non drag pipes and just a dune port...

[1azshee]

bigboybanshee,

New carbs are on the list but for now I have to stick with the stockers and the builder just suggested the setup. I haven't been able to get the builder to call me back to talk about whats going on.

 

loco,

I will be doing a plug check this weekend I wanted to get some time on the motor before I went and ran wide open, the ones that are in there looked pretty black.

 

Thanks for the help I will do a plug check and try 360 mains this weekend.

 

Azshee

[2003LimitedBanshee]

I would actually try going up first before going down. I am currently running 330's with the mods in my signature. No obviously you are probably much warmer in AZ, what is the temp exactly? But when I originally started doing some mods, specifically after the pipes. I rode the first time with 280's and luckily didn't stick it. The power felt flat probably similar to what you described. The key thing to keep in mind is that you can live with be rich and then tune down until its right. But if you lean it out, you may only get one shot. The old standby is to go big, if it bogs (won't clean out in the top gears) go down until it cleans out. This should get you real close, that is when I would start chopping.

[locogato11283]

bigboybanshee,

New carbs are on the list but for now I have to stick with the stockers and the builder just suggested the setup. I haven't been able to get the builder to call me back to talk about whats going on.

 

loco,

I will be doing a plug check this weekend I wanted to get some time on the motor before I went and ran wide open, the ones that are in there looked pretty black.

 

Thanks for the help I will do a plug check and try 360 mains this weekend.

 

Azshee

418423[/snapback]

 

well theres ur problem..you are way too rich if they are anywhere near black..they should be a tan cardboard like color...drop down to 360 and see how it runs and check the plugs..that may still be too rich if your plugs are way black now..

[1azshee]

2003LimitedBanshee It's been around 100 Deg F,

 

How much does temps factor in when jetting? Should I change my jetting from summer (100+ deg) to winter (70-80 deg even colder when riding Glamis at night)?

 

Loco

You probably right and It's to rich but I will take the advise of 2003LimitedBanshee and go up one size first (cheap insurance) the I can get a better feel where I'm at.

 

Thanks for the help

Azshee

[locogato11283]

2003LimitedBanshee It's been around 100 Deg F,

 

How much does temps factor in when jetting?  Should I change my jetting from summer  (100+ deg) to winter (70-80 deg even colder when riding Glamis at night)?

 

Loco

You probably right and It's to rich but I will take the advise of 2003LimitedBanshee and go up one size first (cheap insurance) the I can get a better feel where I'm at.

 

Thanks for the help

Azshee

418466[/snapback]

 

well go aheadand buy new plugs too because if ur plugs are already black, you might as well get some new plugs when u foul these..you are way too rich..drop down a couple main sizes and be done with it..

[2003LimitedBanshee]

1azshee - if you have just been idling along, or only partial throttle, I would not see it as uncommon to have the plugs darken up, even to somewhat black. I have putted around at part throttle for 1/4 to 1/2 mile, pulled the plugs and had them look dark, put in one full throttle blast through all six gears and the color will be spot on. I prefer reading the color off of the electrode, but it seems that many on the HQ prefer brand new plugs and reading the ring on the porcelain that will be exposed during a chop. You should definitely check/adjust your jetting for temp swings like you are describing. Don't get me wrong, loco has a ton of posts, been around for quite a while and is one of the guys to talk to about building all sorts of cool shit. It's just hard to say because if you have been idling or putting around, and they are old plugs, I wouldn't be surprised to see them dark. I will say this, if you move even just one size either up or down it should give you an indication. If down decreases your flat spot, your fat, or vise versa. Good luck

[Banshee~]

I prefer reading the color off of the electrode, but it seems that many on the HQ prefer brand new plugs and reading the ring on the porcelain that will be exposed during a chop.

I just read it by the electrode also, but 380's are to fat, try the 360's like loco said. You might go up a main jet size for the colder temp.

[sandornothing]

Here is the problem, from quarter throttle to around half throttle it pulls like a ported banshee should, but from around half to full throttle it is real flat not much left. I wolud like to get your opinions and solve this problem, could it be my pipes? jetting? reeds? Whats your thoughts.

 

Setup:

just had my motor rebuilt and ported by a well know builder here in AZ, he trued and welded the crank, new top end, re-shaped and milled the stock head, and dune port.  advanced the timing 4 deg. builder told me to setup my stock carbs with #30 pilot, #380 mains and needle clip set on second clip from the tapered side, reeds are stock and I'm running the toomey t4 pipes,  13/43 gearing.  Air cleaners are clamp on K&N no airbox.  mix is 32:1.

Elevation in AZ is around 1000 ft do 90% of my riding at Glamis.

 

Thanks in advance

AZshee

418322[/snapback]

 

This all sounds too familiar to me. Is your builder/porter Charlie Ohton? If so, youre right, he is a muther foker to get ahold of. He ported my cylinders similar to what youve explained and i am having a hell of a time dialing in the jetting as well. He told me the to use the exact same jetting circuits.

 

380 mains

30 pilot (1.5 turns on the air screw)

dyna jet needles (4th clip posit down from the top)

 

My problem oppisite of yours . I am bogging a little on the bottem (so much that i cannot launch in 2nd at the hill anymore) but then it screams once it is in the pipes. I agree with what everyone is saying "380 is way high", but my plugs after a weekend in the dunes are still white with only a hint of brown. Im thinking about putting my needle in the middle to clean up that bogg and i should be spot on. All and all, i will be happy with my porting once i fugure it out, but they have so far ruined 2 trips to Glamis.

 

Not high jacking man, just letting you know i feel your pain.

 

Lets get these things dialed so we can shoot the hill this season.

[Banchetta]

You shouldn't be too concerned w/ jetting until your broken in and opening up the throttle..You'll actually feel the bottom end getting stronger in the first 4 hours of break in. A new motor will feel bagless on the bottom at first and will get stronger w/ some riding time...break it in, then see.

[1azshee]

This all sounds too familiar to me. Is your builder/porter Charlie Ohton? If so, youre right, he is a muther foker to get ahold of. He ported my cylinders similar to what youve explained and i am having a hell of a time dialing in the jetting as well. He told me the to use the exact same jetting circuits.

 

380 mains

30 pilot (1.5 turns on the air screw)

dyna jet needles (4th clip posit down from the top)

 

My problem oppisite of yours . I am bogging a little on the bottem (so much that i cannot launch in 2nd at the hill anymore) but then it screams once it is in the pipes. I agree with what everyone is saying "380 is way high", but my plugs after a weekend in the dunes are still white with only a hint of brown. Im thinking about putting my needle in the middle  to clean up that bogg and i should be spot on. All and all, i will be happy with my porting once i fugure it out, but they have so far ruined 2 trips to Glamis.

 

Not high jacking man, just letting you know i feel your pain.

 

Lets get these things dialed so we can shoot the hill this season.

420734[/snapback]

 

You are a winner Charlie Ohton is correct, he is impossible to get a hold of, I went to the Planet Sand Drags this weekend, knowing he would be there and he basically blew me off wouldn't talk to me at all .

I've given up on getting him to help me, BHQ has plenty of helpfull people we should be able to figure it out. I've got some jets now I just need some time to try them out, It will be some time this week.

 

Our first trip to glamis is going to be Oct 21, so I have a few weeks to get it tuned and ready for the hill. What did you end up using for your mains (380 still)? I will let you know what I end up finding. Whens your next trip to glamis? would like to

be able to compare my port work against another ported shee. Oh yeah what is your sprocket setup?

 

Thanks for the info sucks to hear someone else has been stuck in the same situation,

AZshee

[1azshee]

The 360 mains did the trick, the bike is running awsome.

 

I did the plug chop and it looks like its still a little rich, but its really close. I will

probably try 350's once I run it at the dunes and see how it acts on the hill.

 

Thanks for the help

1azshee

[sandornothing]

The 360 mains did the trick, the bike is running awsome.

Edited October 7, 2005 by sandornothing