Welcome, Guest. Please login or register.
Did you miss your activation email?
September 07, 2010, 02:48:59 AM
Home Help Login Register
News: Welcome To Roll-O-Flex.com

+  Roll-o-Flex
|-+  General Category
| |-+  Everything Else (Moderators: WildOne, _FIII)
| | |-+  1975 Merc Sno Twister
« previous next »
Pages: [1] Print
Author Topic: 1975 Merc Sno Twister  (Read 277 times)
340tnt
Jr. Member
**

Karma: +0/-0
Posts: 51


View Profile
« on: February 26, 2010, 07:21:37 AM »

Heres the completed sled. Not a total restoration but a very detailed servicing/rebuild. Never touched the track or suspension, other than checking bolt tightness. The motor blew on the last two owners, about six reasons why. Crank was bent 3 thou, now its 1 1/2 thou after i straightened it. Seals were a bit hard, two types of hardened gasket goo was on the intake manifolds, the pilot jets were 30, supposed to be 35, mains were 220, could be up to 320 so i put in 290s. Rubber orings were shot in the carbs, replaced the adjustable float bowls with normal float bowl and serviced clutches and chaincase. New needles/seats and fuel pump, tank cleaned and new checkvalve. Timing was advanced a bit, brought it back to the two punch marks.
Boys this sled goes like no 340 should. The faster you go the better it feels. Had her out on some groomed trails, about 28 or 30 miles and what a blast. Close to one of my best rides ever. I will be so bold as to say it does about 80mph, but i want to gps it before i yap too much! I held it wide open many times, sometimes for close to ten seconds and it survived with just premium and lots of cylinder head checks with my hand. Right cyl runs alot hotter than the left. note the exciter at the bear creek hilton, not the only old sled running!
Logged
Steve
Newbie
*

Karma: +0/-0
Posts: 41



View Profile
« Reply #1 on: February 26, 2010, 08:07:11 AM »

Thats a real nice looking sled, youve done a great job of  keeping it looking good. It looks like it was in pretty good shape to start with as well.
One day I'll have to bother you for the carb setup. I havn't been able to get my Wild One running as well as it should be, and I think its in the carb setup.
I havn't had too many motors that I can't sort out, but this one has been a challenge for me.
Logged
WildOne
Roll-O-Flex Collector
Administrator
*****

Karma: +3/-0
Posts: 284

Let's Get Wild


View Profile WWW
« Reply #2 on: February 26, 2010, 10:23:04 AM »

Welcome to the club Steve. I am fighting with a fan and a free air right now. They both run, but I just raced my dad on his 340 Smith Roles and he kicked my ass. It's all about the crab I think. I wish I knew the right jet sizes so I could make mine run fast like a rabbit not this slow slow business.
Logged

Where The Wild One's Are
Steve
Newbie
*

Karma: +0/-0
Posts: 41



View Profile
« Reply #3 on: February 26, 2010, 12:10:26 PM »

The last time I rode my sled I had the 400 F/A in it and it was harder to start than it should be and when I rode it didn't feel like it was making the power that it should be. I did get it up to 72mph and it was still pulling but I ran out of room.
I think I have the carb specs written down somewhere for the 340F/A, but Im not certain that someone else didn't change anything prior to me aquiring the sled, so Im not certain if these are the factory specs for sure.
I was thinking of using some 340 Sno Twister specs but I think that Merc used larger size carbs than ROF did. I'll post the specs that I got my sled with when I find the paperwork.
Logged
WildOne
Roll-O-Flex Collector
Administrator
*****

Karma: +3/-0
Posts: 284

Let's Get Wild


View Profile WWW
« Reply #4 on: February 26, 2010, 02:28:46 PM »

Thanks Steve, much appreciated!
Logged

Where The Wild One's Are
Steve
Newbie
*

Karma: +0/-0
Posts: 41



View Profile
« Reply #5 on: February 28, 2010, 06:01:20 PM »

I found my Carb Specs that came in my 340 F/A Wild One. Like I said earlier Im not sure if these are the factory specs that came with the sled or what someone installed prior to my owning the sled.

Stock Kohler 340 F/A  with dual 34mm Mikuni's in my sled

290 main jet
2.5 slide
P.O. needle jet
#35 pilot jet
6DH8 needle

Here are the stock carb specs for a 1975 Mercury Sno Twister
340 Kohler F/A with 36mm dual Mikuni's (from Mercury Manual)


320 main jet
2.5 slide
Q5 needle jet
#35 pilot jet
6FJ6 needle- 2nd clip from top

Logged
WildOne
Roll-O-Flex Collector
Administrator
*****

Karma: +3/-0
Posts: 284

Let's Get Wild


View Profile WWW
« Reply #6 on: March 01, 2010, 12:44:58 PM »

I will check this with mine and see if it is close........
Logged

Where The Wild One's Are
340tnt
Jr. Member
**

Karma: +0/-0
Posts: 51


View Profile
« Reply #7 on: March 21, 2010, 02:26:12 AM »

I meant for this to go under "other sleds"....Ill delete it and repost.
« Last Edit: March 21, 2010, 02:30:55 AM by 340tnt » Logged
Pages: [1] Print 
« previous next »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!