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Old 05-17-2013, 07:10 PM   #76786
rpet
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^ hey usually you have to pay even more money to get flames out the exhaust.
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Old 05-17-2013, 07:14 PM   #76787
TUCKERS
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The grandchildren were pretty impressed, the Mrs not so much
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Old 05-17-2013, 08:09 PM   #76788
Adv Grifter
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Quote:
Originally Posted by TUCKERS View Post
Today installed Acerbis tank (2 taps), Deluxe air screw, GSXR can and big mid-pipe, K&N air filter.

It ran good before.

Now it runs like crap.

Stutters and bangs and flames at full revs

Shoots FLAMES out the exhaust

Pops and bangs on decell. Flames shoot out and it sounds like a big gun going off. BAM! BAM!

What do I do next?

All stock before.
Wow! That is unusual! A few things come to mind ...
1. Plastic shavings in the new tank from manufacturing. (Always rinse before use) Tiny bits inside may have clogged up something in the Carb?

2. "Deluxe air screw"? You mean an extended Fuel screw on bottom of Carb? If so ... some are faulty and don't work properly. I think Pro Cycle had a few bad ones from a supplier ... this a while back. Some don't fit the Carb ... but can't imagine it would create the results you're getting!

3. With the mid pipe, GSXR Can and K & N you are flowing more air but not letting much in. Might need to pull snorkel and go with a slight increase on main jet size? (maybe one size up?)
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Old 05-17-2013, 08:28 PM   #76789
Mambo Dave
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Quote:
Originally Posted by Adv Grifter View Post
2. "Deluxe air screw"? You mean an extended Fuel screw on bottom of Carb? If so ... some are faulty and don't work properly. I think Pro Cycle had a few bad ones from a supplier ... this a while back. Some don't fit the Carb ... but can't imagine it would create the results you're getting!
and some guys lose, or leave in, either the spring or the o-ring that need to be accounted for.

I've heard of similar incidents from o-rings that were destroyed, forgotten about, springs that flew, etc. all from the fuel screw area.
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Old 05-17-2013, 09:03 PM   #76790
8gv
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Quote:
Originally Posted by Adv Grifter View Post
Blocked Pilot Jet? Replace it.
Check for crap in your intake track.
Make certain there is no WATER/Rust residing in bottom of fuel tank.
Have you checked the little plastic white fuel filter? It lives in the metal fuel tube going into Carb.

Bike will run pretty well with one plug ... but much better with two. I believe they fire just a hair apart from each other ...not sure.

Good luck getting it sorted.
Tank is clean. Fuel inlet filter is clear.
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Old 05-17-2013, 09:16 PM   #76791
ER70S-2
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Quote:
Originally Posted by TUCKERS View Post
Today installed Acerbis tank (2 taps), Deluxe air screw, GSXR can and big mid-pipe, K&N air filter.

It ran good before.

Now it runs like crap.

Stutters and bangs and flames at full revs

Shoots FLAMES out the exhaust

Pops and bangs on decell. Flames shoot out and it sounds like a big gun going off. BAM! BAM!

What do I do next?

All stock before.
Did you open the airbox? If so you're really lean. If not, it should run reasonably well without jetting changes. At 6,000 feet mine jumped in performance when I added the GSXR, without jetting changes (snorkel out).

I'm thinking you're quite lean, the DR runs pretty well when way too rich, the gas mileage just plummets.

I don't know much about the K&N but if it's over oiled I think the air flow chokes.
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Old 05-17-2013, 10:02 PM   #76792
Krusty ...
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Quote:
Originally Posted by joefromsf View Post
Could be a vapor lock in the gas tank. What kind of tank and gas cap do you have? Note that you can usually tell if its vapor lock by immediately opening the gas cap when it dies. If you hear air being sucked in, then it was probably vapor lock.
That's not vapor lock, that describes a blocked gas tank vent hose. Which is what I think is the culprit, spjinseatle. As Joe describes, when the engine starts to sputter, open the fuel cap. If the engine immediately recovers, along with a whoosh of air, you know you've found the trouble.

Vapor lock often occurs when engines are shut off in hot climates. Gasoline starts to vaporize in the fuel lines. The pressure in the lines keeps fuel from flowing, keeping the engine from restarting. Park the bike (or car) in the shade for ten or fifteen minute, and often all will be well.
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Old 05-18-2013, 12:04 AM   #76793
motolab
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Quote:
Originally Posted by eakins View Post
Motolab Derek, I think what people are saying here is they are real happy with the performance that the extra hole in the slide gives them (as well as a shimmed needle).
Fine by me.
Quote:
Yes it's not perfect, nor is the world. & Yes it may wear out the slide and guide quicker over it's life, but that trade off is worth it for more fun on the bike...isn't that why we ride for fun???
I'm convinced that more fun can be had without having to wear out the parts quicker.
Quote:
It's a cheap mod and working very well for alot of us.
The problem is that "working very well" is in this case highly subjective. I'm interested in facts.
Quote:
No one likes to be told they're wrong when it's working for them.
Does the desire to not be wrong override the desire to know the truth?
Quote:
If someone wants to use a DJ needle so be it.
Absolutely, but don't people want to make educated choices?
Quote:
Since you're in the biz to sell these parts, maybe a better approach is just say enjoy how it runs and maybe check in with me when your mileage gets up there for a carb refresh as it will help get back the original running feeling you love.
Your suggestion implies that if I know that certain preventable circumstances accelerate wear, I should not warn anyone about them so that I can sell more parts. It also implies that if I think that there is a simple (or otherwise for that matter) way to make an engine run better, I should not say so for fear of ruffling feathers. Please consider the broader implications.
Quote:
Your current approach seems to be alienating many who might need to buy your parts but don't want to deal with you now.
I was brought up to tell the truth. If that means I don't sell another motorcycle part, then so be it.
Quote:
Pick your battles and know when to let them go.
I don't relate to this as warfare.
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You really do offer a great supply of BST parts for the DR community and we appreciate it.
You're welcome!

Regards,

Derek
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Old 05-18-2013, 12:10 AM   #76794
joexr
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.Does the desire to not be wrong override the desire to know the truth? Regards,

Derek[/QUOTE]
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Old 05-18-2013, 12:21 AM   #76795
Rainier_runner
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Anybody watch the "Big Bang Theory"? Cuz Derek reminds me of the most awesome and epic Sheldon Cooper.

Derek, please take this in the fun spirited intention in which its meant. I greatly appreciate your knowledge and insight. Its simply the matter of fact and positive delivery in which you give your information.
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Old 05-18-2013, 01:27 AM   #76796
eakins
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Quote:
Originally Posted by 8gv View Post
Thinking small is a good idea. I had the pilot jet out and blasted it with carb cleaner. I could see through it. The common thing in all three that I've ridden is a period of disuse. Maybe I need to treat the carb to a few overnights at the Pinesol motel.
make sure to pull out the main and pilot jet, verify the hole is clear on both and soak them too.
I also pull out the pilot screw assy.
pinesol works very well as a slow and steady cleaner.
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Old 05-18-2013, 11:05 AM   #76797
TUCKERS
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Joined: Dec 2005
Location: Villa Maria Sanitarium, Claremont, CA.
Oddometer: 11,555
Quote:
Originally Posted by TUCKERS View Post
Today installed Acerbis tank (2 taps), Deluxe air screw, GSXR can and big mid-pipe, K&N air filter.

It ran good before.

Now it runs like crap.

Stutters and bangs and flames at full revs

Shoots FLAMES out the exhaust

Pops and bangs on decell. Flames shoot out and it sounds like a big gun going off. BAM! BAM!

What do I do next?

All stock before.
After I put on mid pipe and can it ran good. So I must narrow it down to carb/air cleaner/smog equip.

I cleaned out Acerbis with gasoline.
I removed carb and took out fuel screw and spring and O ring. replaced with Deluxe fuel screw/spring/flat washer/O ring. two and a half turns out to start.
I removed smog equipment and put a cap on bottom and top of carb.
I took out OEM air filter and replaced with K&N.
No air box mod, no cutting. Snorkel intact.
Ran good before carb/air filter work.

I wonder if I pinched rubber boot on intake tract, or fuel screw is bogus. I'll replace fuel screw with original and see if that changes anything.
Anyone else got ideas or this happened to you?
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Old 05-18-2013, 11:15 AM   #76798
TUCKERS
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Location: Villa Maria Sanitarium, Claremont, CA.
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Quote:
Originally Posted by ER70S-2 View Post
Did you open the airbox? If so you're really lean. If not, it should run reasonably well without jetting changes. At 6,000 feet mine jumped in performance when I added the GSXR, without jetting changes (snorkel out).

I'm thinking you're quite lean, the DR runs pretty well when way too rich, the gas mileage just plummets.

I don't know much about the K&N but if it's over oiled I think the air flow chokes.
No oil on a K&N
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Old 05-18-2013, 11:37 AM   #76799
Adv Grifter
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Location: Passing ADV Stalkers in California
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Quote:
Originally Posted by TUCKERS View Post
After I put on mid pipe and can it ran good. So I must narrow it down to carb/air cleaner/smog equip.

I cleaned out Acerbis with gasoline.
I removed carb and took out fuel screw and spring and O ring. replaced with Deluxe fuel screw/spring/flat washer/O ring. two and a half turns out to start.
I removed smog equipment and put a cap on bottom and top of carb.
I took out OEM air filter and replaced with K&N.
No air box mod, no cutting. Snorkel intact.
Ran good before carb/air filter work.

I wonder if I pinched rubber boot on intake tract, or fuel screw is bogus. I'll replace fuel screw with original and see if that changes anything.
Anyone else got ideas or this happened to you?
Hey James,
Sounds like you've got a lot of this covered.
The stock Fuel screw has: Washer, O ring, Spring. I used the stock items on my extended fuel screw. It worked fine. (Ty Davis fuel screw)

Make sure the cap on the Carb Vacuum fitting is TIGHT and not leaking. I put a tiny hose clamp on mine to seal it off.

Good idea to go back to stock Fuel Screw. Can't hurt!
If still running poorly, try removing Snorkel ... just for laughs.

Good luck!
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Old 05-18-2013, 11:50 AM   #76800
TUCKERS
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H'mmm?

I'm going to have to take out the fuel screw and have another look.

New one came with spring/washer/O ring.

I took out old screw and spring, but I'm not sure I go the old O ring and washer now if there was one.
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