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Post by magnesium on Mar 19, 2011 21:10:44 GMT -6
Joe, There's also something else under the hood, I only know because I spoke with Jim about it. What could it be? ;D The engine is offset to the left,both pipes must go right.Could only be done using a jackshaft.I plan on putting together something like this with that 500 3LC I posted earlier in this thread. |
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Post by Sticks on Mar 19, 2011 21:32:46 GMT -6
Gold star for Rick!
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Post by snosnake on Mar 19, 2011 22:02:07 GMT -6
Thats pretty much what this is. Pretty easy to do.  |
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Post by Sticks on Mar 19, 2011 22:24:08 GMT -6
Rick is that Jakes speedway with the liquid engine?
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Post by snosnake on Mar 20, 2011 7:10:50 GMT -6
Yes it is Stick's. It has a 340 Zenoah Green Dripper in it. It runs great. He needs to get some air filters on it though as the carbs will ice up on a snowy day or if there is a lot of snowdust in the air.
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Post by Sticks on Mar 20, 2011 19:02:39 GMT -6
Rick, on a few of our new sleds they have coolant lines running through the carbs, with the option of turning them on and off for colder weather. might be an option Jake could look at?
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Post by snosnake on Mar 20, 2011 19:07:15 GMT -6
To much work and money to go that route. I told him to take some pantyhose and cover the carb intake.
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Post by mrmagnum on Mar 23, 2011 16:06:34 GMT -6
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Post by rupprat on Mar 23, 2011 16:43:45 GMT -6
OH WOW  Very Nice! My all time favorite Yamaha. Never had a GPX, but always wanted one from the first moment I saw one! |
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Post by rupprat on Mar 23, 2011 16:44:47 GMT -6
After seeing this one, I still want one!
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Post by magnumed on Mar 23, 2011 18:50:32 GMT -6
Nice GPX, I noticed some of them have 433f and some 433g what is the difference? 74 to 75? not a yamaha guy but looking to change brands  rick already spoke up for merc f/a twisters, banks got the liquid mercs, John deere didnt make a fast sled, what other choices do I have?  |
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Post by magnesium on Mar 23, 2011 19:00:12 GMT -6
Nice... but looking to change brands .. what other choices do I have? With the collection of free airs you have? Maybe a liquid Magnum before you change brands. |
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magnumforce
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Post by magnumforce on Mar 23, 2011 19:15:24 GMT -6
After seeing this one I wished we still had ours! they were both 75 G's, 74 F had cleated track, low comp heads XA cylinders, 75 rubber track hi compression heads XB cyls, ski wideners, cheap to fix and easy to find parts (tracks, pistons, etc ;D) and go like hell
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Post by red19lite on Mar 23, 2011 19:56:35 GMT -6
my friends had gpx 338s and gpx433s back in 1976-77 they had to race me everytime out for two years straight, i was running 76 magnum 340 at the the time with dulco quick shift clutch and studded track i had more trouble with 440 fa rupp and 440 fa sno twisters in drag races, they were working on them yamahas all the time had those keihin carbs on them stock , the 76 magnum 340 had a hole shot and good top end with that dulco clutch back then it was easy to adjust the weights with adding or taking out shims on the arms and had a good back shift, then one of the yamaha guys got a 76 srx liquid balance of power shifted again you had to get a new sled about every two years back in the 70s
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Post by mrmagnum on Mar 24, 2011 6:18:39 GMT -6
Yes the 433f was a 74 and the 433g was the 75 gpx. I can't wait to get the mod hood on it! ;D ;
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Post by Sticks on Mar 24, 2011 18:08:21 GMT -6
Bob, sorry I couldn't go along yesterday to pick up that sled, Wife has me tied up!
Nice looking sled! We'll have fun running it down the track next winter!
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Post by Sticks on Mar 25, 2011 19:11:54 GMT -6
What's going to be faster, the GPX or my Sno Twister?  |
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Post by mrmagnum on Mar 25, 2011 20:46:53 GMT -6
The gpx...If I can find out how Dave h. has his set up. ;D His ran around 96 mph! I'd be happy with 85 to 90. Game on?
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Post by Sticks on Mar 25, 2011 21:01:20 GMT -6
Ok you win! ;D I'll buy the beer
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Post by jimgrandmi on Mar 27, 2011 20:07:19 GMT -6
Here is an early photo of the 75 F/A with a liquid jackshaft assembly, Merc Twister pipes and a hydraulic brake added. I am hoping to have the machine cleaned and painted for this summer's show. (This picture was taken before the 73 Magnum paint scheme was added.)  |
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