97 580zr EFI injector question? - Page 2 - Snowmobile Forum: Your #1 Snowmobile Forum

Grudman · 12-13-2012, 10:29 PM

His ecu is triangle his injecters are sqaure wrong type. needs the number I posted!

**kccats** · 12-14-2012, 06:03 AM

Well let me see if I have a ECU!

Grudman · 12-15-2012, 10:26 PM

Any update?

ZRNUT · 12-17-2012, 09:54 AM

Well we got rain all weekend so i was unable to run the sled but i did go out and get a square ECU to match my Injectors. they are talking a snow storm for later this week hopefully enough so i can test run it. The only other thing i was thinking would be gearing like RJ said. So if this doesn't change anything does any one know how many tooth sprocket should be in the drive case?
Thanks to Grudman and KC for you extra efforts finding the Injectors and looking into an ECU. I paid $50 for the ECU Will keep you posted to if this solves the problem.
Grudman how did you know that the injector was sticking?

**kccats** · 12-17-2012, 07:01 PM

The gearing should be 19-39!

ZRNUT · 12-21-2012, 10:06 AM

Well we had 10" last night. Took the sled out today no change in the fuel consumption. Still a real pig.
So i guess i'll pull the gear box apart and start counting teeth. Wish i had thought of this when i put the new bearings in. Will keep you all posted as to what i find in there. If this isn't it i'm leaning towards the Air sensor in the air box. maybe it's no good. Otherwise i'm totally stumped.

**kccats** · 12-22-2012, 07:11 AM

Did you ever put the fuel presure gage on Both sleds?

ZRNUT · 12-24-2012, 07:22 AM

Only on the problem sled. I rode them both out this weekend. Here is what i found. Problem sled engages at 4500 the other one at 3800 at 40MPH the problem sled is at 6500rpm the other one is running at 6000 rpm. I pulled the gear box apart and the gearing is correct for that sled. (19 & 39 ) Here is my next question. They both have yellow spring in the drive. Is it possible to have a different yellow in one or does the white or green dots on the spring make that big of a difference? They both have the green dot on a yellow spring.

**RJ Gleason** · 12-24-2012, 07:27 AM

What about the weights, are they the same?
A gram difference will be 100 rpm.

ZRNUT · 12-24-2012, 07:40 AM

Never checked them> Do i have to pull the drive apart to see the weight numbers?
This could be it since i had the drive rebuilt on my problem sled. I just assume the guy would put the stock weights in. but maybe he replaced them with what was in originally

**RJ Gleason** · 12-24-2012, 07:43 AM

You should be able to read the stamp on the side of the weight without removing them.

Also, the helix angles may be different too.

ZRNUT · 12-24-2012, 07:53 AM

My problem sled has a roller driven on it but the other one has the original poo style on it yet. So that makes it kind of tough to compare.

ZRNUT · 12-24-2012, 09:19 AM

What would be the stock weights on the drive? 53?

Grudman · 12-24-2012, 09:55 AM

Did a bench test on them. The flow at wide open wasn't enough. Let me see if I can find a video. Hard for me to explain it in text!

Arctic Cat Cleaning Service for Fuel Injection $30 - YouTube

Not best vidoe but you get the idea! You can always take them in to be checked!

ZRNUT · 12-24-2012, 10:10 AM

Thanks for the link i will try that too. I'm thinking it's not in the fuel end now. The Plug chops this weekend look good. My buddies who were riding with me said that to them my problem sled smells less than the other one and it definitely smokes less at a stop. So i'm really thinking it's the spring in the drive or the weights like RJ is asking. Will check that out this afternoon.

Grudman · 12-24-2012, 12:32 PM

Probably is, Just one those things you need to check wish you luck!

Let know what you find!

**RJ Gleason** · 12-24-2012, 06:35 PM

Likely that the roller has a straight 53 helix and the button unit is a 56/43 helix.
That should have A-25 [49.5 gr] weights as stock which would give an engagement of 3800rpm with the spring you have.
It's likely that the weights are heavier [possibly 54 gr] which would give a higher engagement of 4500+.

ZRNUT · 12-25-2012, 09:03 PM

well here is what i've found. I bought a new yellow/ green drive spring. it dropped my engagement rpms from 4600 to 4200. My weights are a straight 49 and my helix is a bit confusing. It has a number on it is 006048-005 I'm thinking that it's a 48* is my thinking right. All the helx's ive looked at always had the degrees in a plain number. This is also a yellow spring on the driven.
If this is a 48 then going to a 53 or a 55 will do what? Could this be where my fuel issue is? Sorry for all the questions.

**RJ Gleason** · 12-26-2012, 01:15 AM

Now, we need to know the peak rpms, your target is 8000/8200.
You will adjust that with the secondary.

ZRNUT · 12-26-2012, 06:52 AM

I will get it out this afternoon and run a top speed rpm on it.
That spring i took out was yellow but it looked like it was green at one time and repainted yellow. It was mostly green with just small amounts of yellow here and there.