Help with carb tuning

Tyler Zane

Tyler Zane

Open Your Eyes
Location
Panama City Beach, FL
Im have bee having trouble dialing in a set of OEM 44's on a Able cylinder/HPE 8mil. I can dial it in on the lake and it will run great but as soon as I hit the surf it starts loading to the point where it just runs terrible. I can also dial it in to run great in the surf but then it doesn't preform on the lake in the upper rpm's as well.

Am I asking to much of this engine and carb set up? Are there some combos that just don't work for everything across the board?

I have tried a handful of jetting combos. I started with 1.5seat/65 gram spring 117.5 pilot 130 main. This preformed great on the lake with the low screws at 1 turn and the high's at one turn but was terrible in the surf where the rpm's are typically lower to mid. I was advised to start going up on the pilot jet and down on the main jet. One set at a time I went all the way to 130 pilot and 117.5 main. The mid range condition slowly got better with each step but im not sure where to stop. I have no experience with reverse jetting...

Right now im looking to to throw a single 46 on it and give that a whirl with standard jetting. I just read the mikuni manual again as well as the watcon guild so im gonna take another approach. I want to start playing with pop off also.

Any input appreciated... Thanks
 
Harbor

Harbor

Location
Stockton
Fwiw on my 8mil 865 Lamey and the 5mil
HPE 820 I put and tuned into my friends boat I used the same jetting. The Lamey ran great with 100l 125h and 14 pop off on 4 transfer port 44's...

I was recommended similar jetting as you've listed for the HPE 820 but went my own route with what worked for me on the Lamey 865. Figured if the 865 runs good why would an 820 need more. Both ran great and required no further jetting.

You might try less.
 
Tyler Zane

Tyler Zane

Open Your Eyes
Location
Panama City Beach, FL
Harbor said:
Fwiw on my 8mil 865 Lamey and the 5mil
HPE 820 I put and tuned into my friends boat I used the same jetting. The Lamey ran great with 100l 125h and 14 pop off on 4 transfer port 44's...

I was recommended similar jetting as you've listed for the HPE 820 but went my own route with what worked for me on the Lamey 865. Figured if the 865 runs good why would an 820 need more. Both ran great and required no further jetting.

You might try less.
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Thanks, I will definitely try it. I have the 3 transfer hole 44's which I hear are harder to get rid of a spot in the mid range.

Did those engines preform well all over the board? My pop off is 32psi.. I get mixed responses to go up or down on pop off. I'm still wrapping my head around pop off and how it works even after reading to manual several times.
 
Big Kahuna

Big Kahuna

Administrator
Location
Tuscaloosa, AL
Running DASA 820 with Blackjack 44's. 127.5 Main and Pilot.

I have some Team Scream Modified AM SBN's if your interested. OEM 44's work great on a 760. But after that it can be difficult. They were designed to be run on the OEM 760 motor.
 
Tyler Zane

Tyler Zane

Open Your Eyes
Location
Panama City Beach, FL
Big Kahuna said:
Running DASA 820 with Blackjack 44's. 127.5 Main and Pilot.

I have some Team Scream Modified AM SBN's if your interested. OEM 44's work great on a 760. But after that it can be difficult. They were designed to be run on the OEM 760 motor.
Click to expand...

thanks, what popoff are you running? How did you end up with the same size pilot and main?
 
Big Kahuna

Big Kahuna

Administrator
Location
Tuscaloosa, AL
Ordered new carbs back in June. Then in July/August picked up new DASA Shortblock, contacted Art and asked for target recommendations. He said bump the main to 125 - 130. So, plugged in 127.5. Spot on. Never pulled the NS to see what size. Just sent Art and email asking.
 
Harbor

Harbor

Location
Stockton
tzane said:
Thanks, I will definitely try it. I have the 3 transfer hole 44's which I hear are harder to get rid of a spot in the mid range.

Did those engines preform well all over the board? My pop off is 32psi.. I get mixed responses to go up or down on pop off. I'm still wrapping my head around pop off and how it works even after reading to manual several times.
Click to expand...

Yes The Lamey ran good all rpms, both lake & ocean too...( did not run a bouy course) just freestyle and freeride riding....

The 820 is the same except it hasn't been in the ocean yet....

Matt usually starts everyone off rich. Then you tune from their, it's a safe way to go. Lots of people at those settings seemed to have issues being too rich.

Think it was 2.0 seat and 65 gram spring and 100L and 125H 14 pop off I used in the 4 hole 44's.....dont have any 3 holes to try, if I did I would
 
Quinc

Quinc

Buy a Superjet
Location
California
tzane said:
Yes I'm running a b pipe.

I'm picking up a set of am 44's from bk and I'll give both harbor and your recommendation a go.
Click to expand...

If those 44's where any good I dont think he would be selling them. :p On that engine I would go with a set of oem 46's off amazon.
 
Big Kahuna

Big Kahuna

Administrator
Location
Tuscaloosa, AL
Quinc said:
If those 44's where any good I dont think he would be selling them. :p On that engine I would go with a set of oem 46's off amazon.
Click to expand...
I bought new Blackjack 44's. Never owned a new set of carbs!!!!!! That being said, I thought there was an issue with the carbs. Turned out to be a cracked carbon exhaust tube in my freak where your rubber tubes attaches to the outlet in the bulkhead. No Carb can process Exhaust Gases!

DASA 820
127.5 Low
127.5 Main
2.0 115G Spring

Jetting was spot on for my DASA 820.
 
Harbor

Harbor

Location
Stockton
Fwiw It's got 2.3 seat and 14 psi pop off.... Brian Vergin built my +8mm 85 bore Lamey race gas engine. He supplied the carbs as well for my ride style @ the time rec/freeride. He had three carbs off that site to choose from, black 44's, silver 44's and 46's. He choose 44's for fuel economy and those with that jetting over the other 2 with bigger jetting. Worked perfect out of the box once I assembled it.

Steve at the Watercraft Factory water tested my ski, Chris Anazeski was flipping my ski and Eli kemnitz and Derrick checked the tune on my ski and water tested it and found no carb adjustments were needed....

When I switched to FS 49's my jetting was bigger 125L 135H and the Lamey worked fine on that too.....

My buddy's 44 black jacks on his 4 mil dasa 1000 have bigger jets like my 49's did 125L 135H, and like your blackjack 44's

Maybe it's like you said, the OE 3 hole 44's are temperamental, either way, for me, all that I see at his starting jetting don't run right and need rejetting

Silver 44's with bigger jets
https://www.atlanticjetsport.com/index.php?l=product_detail&p=1091

46's
https://www.atlanticjetsport.com/index.php?l=product_detail&p=1093

Edit: Now that I think about it Harris, I remember a conversation with Brian On jetting, and I didn't want to be jetting the carbs all the time. This is probably the reason he picked the smaller jetted 44's over the larger jetted 44's
 
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Tyler Zane

Tyler Zane

Open Your Eyes
Location
Panama City Beach, FL
I appreciate the info. The carbs I'm getting from BK are the black 44's with 4 transfer holes. I just ordered jets for them and I'll try them out next week. If these fix the issue, then I have wasted a ton of time on those oem carbs...
 
Quinc

Quinc

Buy a Superjet
Location
California
tzane said:
I appreciate the info. The carbs I'm getting from BK are the black 44's with 4 transfer holes. I just ordered jets for them and I'll try them out next week. If these fix the issue, then I have wasted a ton of time on those oem carbs...
Click to expand...

Blackjacks do not use the transfer holes. They spray the fuel through 12 holes around the rim.

Looks like this:
 
Tyler Zane

Tyler Zane

Open Your Eyes
Location
Panama City Beach, FL
Quinc said:
Blackjacks do not use the transfer holes. They spray the fuel through 12 holes around the rim.

Looks like this:
Click to expand...

Im not getting blackjacks. I'm aware of what annular discharge carbs are. I was saying I purchased retail 44's from BK (actually team scream 44's). The ones with 4 transfer holes unlike my oem 44's with 3.

I have your jetting recommendation on hand also and will try it also.
 
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