700 TempaFlow jetting

W

WrdAl

New member
Joined
May 7, 2003
Messages
108
Location
Anchorage, AK
All right guys, I asked this last year and didn't get any responses, let's try again.

I have a 99 700 MM with TempaFlow. I usually ride from sea level to about 2000 feet (Anchorage, Alaska) with planned trips to about 3200ft (Eureka). Have stock jetting in it now (145, 143.8, 143.8 ) which is good for 300-1700ft at 0F. Jetting charts say to use 146.3, 145, 145 for this altitude to -20F. But here's the kicker, the fuel that is most available is oxygenated (ethanol? not MBPE?) which should require richer jetting.

What should I do? Use the suggested jetting (146.3, 145, 145 ); go to the next step (147.5, 146.3, 146.3) which is for 300-1700ft at -40F? or go bigger yet (148.8, 147.5, 147.5 sea level-300ft -40F)?

Or should I take the darn thing off and forget about it? The thing is, the temp here varies so often (anywhere from -20 to +40) that I really want to keep it.

There has to be someone facing a similar dilema, Help!!!
 
For question like that I would call Holtzman Engineering and talk to someone directly. They should be able to help you out. Their phone number and e-mail is listed on this site in the favorite links section. I'm not sure what you would do with the oxygenated fuel. I am installing a Tempaflow on my 2000 SRX and jetted it to the 2001 SRX jetting (Mains only).
 
I would call Holtman but I would just fatten it up a bit with the tempa flow dial. Or fatten it up a jet size and leave the tempa....is it going to be -20 where your going to ride??
 
MrSled,

I've got the TempaFlow set 1/8 turn rich now with the stock jetting and the plugs are a light cardboard brown color. Can't see the wash very well but piston tops still look black. Since we're on the coast, our temps vary a great deal. One weekend could be -20 the next weekend could be 30+, that's why I want the TempaFlow to work.

What's throwing me for the loop though is the use of Oxygenated fuel which results in "apparent" leaner jetting. Depending on where I go sledding, I have access to non-Oxygenated fuel if I go north of town but not if I head south of town. So I've decided, for consistency sake, to use the Oxy-fuel as my primary fuel. I also remember an article from SnowTech a couple of years ago that showed the cleanest emmissions, by far, are to use oxy-fuel and a good synthetic oil.

Guess I better send a note off to Holtzman.

Thanks for the feedback.

Al
 
Last edited:
Barry Holtzman

WrdAl - When you call Holtzman, make sure to talk to Barry directly. He's one smart dude and is extremely helpful with questions like yours. I worked with him quite a bit last year on some experiments with a Tempaflow on my piped Viper and his knowledge was invaluable. I'm sure he'll be able to tell you exactly what you need to know.
 
Reply from Holtzman

The suggestion from Holtzman is to run the following:
147.5, 146.3, 146.3 for my riding area with Oxy-fuel.

Here's my chain of emails with Holtzman:



Barry,

Thank you very much for your quick response. Yes, Yamaha does chart down to sea level and -40 (here's an link as an example: http://www.zenitram-inc.com/Manuals/MM700TU2.jpg) and thier specs are notoriously conservative (rich).

I've ridden to -20 but not to -30, but it's wise to be prepared in case the temp drops while out or get stuck out overnight.

Again, Thank you for the incredible customer support!

Allyn Libke
-----Original Message-----
From: Barry
Sent: Tuesday, November 16, 2004 1:40 PM
To: Libke, Allyn
Subject: Re: Jetting suggetions for Oxy-Fuel?


with the tempa flow you would jet for the -40 setting if you ride to as low as -30F (you can also interpolate from -30 to -40 if you would like) so i guess i would use the center jetting you suggested. does yamaha actually give a jetting difference for 0-300 feet as opposed to 300 feet to 1700 feet as shown in lines 2 and 3 (that is only an altitude change of 300 feet since you always go by the lowest elevation and temperatre in the range). holtzman

----- Original Message -----
From: Libke, Allyn
To: holtzeng@direcway.com
Sent: Tuesday, November 16, 2004 1:36 PM
Subject: Jetting suggetions for Oxy-Fuel?


Dear Mr. Holtzman,

I realize that you probably receive many requests like this and your instructions state that you don't make specific recommendations, however, I have not been able to get my question answered locally and would greatly appreciate your input.

I have a 99 700 MM, (stock pipe) with a TempaFlow installed. I've got the TempaFlow set 1/8 turn rich now with the stock jetting (145, 143.8, 143.8 ) which is recommended for 300-1700ft at 0F, and the plugs are a light cardboard brown color. Can't see the wash very well but piston tops still look black. This jetting is lean but I'm confused as to what to go to.

What's throwing me for a loop is the use of Oxygenated fuel (ethanol? not MBPE?) which is mandated locally and is the most readily available. Depending on where I go sledding, I have access to non-Oxygenated fuel if I go north of town but not if I head south of town. So I've decided, for consistency sake, to use the Oxy-fuel as my primary fuel. I realize that occasional use of Non Oxy-Fuel (remote stations) will cause a rich setting but that is acceptable.

I usually ride in the 300-1700ft range (Anchorage, Alaska) with occasional trips to about 3200ft, and rare times down to sea level, all of which are within the TempaFlow range of adjustability. We usually ride from -15F to +30F, but our temperatures can vary a great deal from -30 to +40 at anytime during the riding season.

Which of the following factory suggested settings would be the best starting point for use with the TempaFlow and Oxy-Fuel?
#1 - 146.3, 145, 145 for this altitude (300-1700ft) to -20F.
#2 - 147.5, 146.3, 146.3 for this altitude (300-1700ft) to -40F.
#3 - 148.8, 147.5, 147.5 for sea level-300ft to -40F.

I would greatly appreciate your input as the local dealer's suggestion is to remove the TempaFlow and change jetting as temps dictate. I'd rather rejet now and use your product.

Thank you in advance,
Allyn Libke
Anchorage, Ak
 
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