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Post by 74nitro2 on Jan 28, 2015 14:01:17 GMT -6
I have an idea that i need a 36mm carb, flange adapter and cable, however I do not know what size jets to use.  can anyone shed some light on this? Maybe someone has all the goodies I need and is willing to part with it? I will probably have to use the spacer that is on there with Mikuni so it will clear the coil... Attachment Deleted |
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Post by dacota25d on Jan 28, 2015 15:14:23 GMT -6
I canthelp you with jetting but I'd recommend a 38 or is your class limited to a 36?
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Post by 74nitro2 on Jan 28, 2015 18:28:03 GMT -6
No limit. 38mm it is. Thanks for info
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Post by gruppski55 on Jan 28, 2015 18:44:10 GMT -6
you need 35 pilot jet and 290 main jet I have it on a tr440s 3 nitro 38 mic
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Post by snosnake on Jan 28, 2015 20:09:07 GMT -6
Do you know what needle jet and Jet needle you have in the 38mm.
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Post by 74nitro2 on Jan 29, 2015 8:19:35 GMT -6
Do you know what needle jet and Jet needle you have in the 38mm. I will check with Art Templeton, he is local salvage yard and has lots of vintage knowledge. he is the one that recommended the mikuni. The engine has been tuned by ruppman and is making 190 compression. will that make a difference on jet selection/sizing? |
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Post by rupprat on Jan 29, 2015 9:43:22 GMT -6
You will also need a throttle block from a '75 or newer Rupp sled.
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Post by ruppman on Jan 30, 2015 12:28:49 GMT -6
I would start with 400 Main jet and work my way down. It's always better to start big rather then burn down.
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Post by MrPeabody on Feb 2, 2015 13:22:19 GMT -6
I put Mic's on my Yankees. I just took a rupp carb from a 75 nitro. I used the stock throttle setup from the sled. I took the brass off the throttle end of the cable. Rounded the end of the cable that went into throttle lever because it wouldn't flex and broke the cable. Then I just bent the throttle lever out a bit to give it full range. However I found a crome lever that looked similar at a swap meet that fit and was for a Mic and was bigger than the stock 73. When I find it it will go on my 72 nitro. My carb cleared the coil cover barely so I don't know about the 400s-3.
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Post by kluth on Feb 4, 2015 15:19:48 GMT -6
I put Mic's on my Yankees. I just took a rupp carb from a 75 nitro. I used the stock throttle setup from the sled. I took the brass off the throttle end of the cable. Rounded the end of the cable that went into throttle lever because it wouldn't flex and broke the cable. Then I just bent the throttle lever out a bit to give it full range. However I found a crome lever that looked similar at a swap meet that fit and was for a Mic and was bigger than the stock 73. When I find it it will go on my 72 nitro. My carb cleared the coil cover barely so I don't know about the 400s-3. Do you have a picture that you could post? I'm kind of interested in this, myself. Kirk |
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Post by MrPeabody on Feb 4, 2015 16:32:02 GMT -6
1st start with a single carb cable as the multi cables don't have a big enough end. Cut off this brass end. I used a dremel with cut off wheel. Be careful you don't hit the cable and frey it.  Then round this end to a ball so it rocks in the stock throttle lever otherwise it will break the cable. if you bend something back and forth it will weaken or break.   Then I bent a old stock throttle lever enough so when pressed wide open the carb was also wide open. But as I said I found a vintage large chrome lever. It looks like a stock one that will fit bar and then you shouldn't have to round the end or bend the lever. I just cant find it as of right now  Oh, I also used mic choke cable. just took off cable clip and used a tube clamp to hold it in place.  Hope this helps you out! Tom |
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Post by kluth on Feb 9, 2015 12:29:08 GMT -6
That helps me out very much. Thank you for the information.
Kirk
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Post by 74nitro2 on Feb 9, 2015 18:22:16 GMT -6
Definitely good info! Great idea with the throttle cable. Thanks for the help, and photos.
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Post by lemans1955 on Feb 9, 2015 18:29:37 GMT -6
How did you run up at Sunnyvilla Mike? I'll be there next Sunday.
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Post by 74nitro2 on Feb 10, 2015 7:51:07 GMT -6
We ran good except poor turnout caused a grouping of all 400's
Pre 85'. Not really fair. I would expect the same for this weekend
Supposed to be record low temperatures. I wanted to go to Bear Brook.
Good luck racing! Maybe we'll see you there
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Post by lemans1955 on Feb 10, 2015 13:15:11 GMT -6
That's disappointing, well if you go next week two more 73 and under 400s will be running!
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Post by lemans1955 on Feb 10, 2015 13:16:12 GMT -6
Me or my nephew on the 73 and my buddy Chris on the 71 Motoski
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Post by 74nitro2 on Feb 11, 2015 8:00:02 GMT -6
Hopefully see you on the 21st. This Sunday will be 9 degrees with 20 MPH winds. I hope to be at Bear Brook this weekend, and near a wood stove.  |
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Post by lemans1955 on Feb 11, 2015 19:43:07 GMT -6
What's going on at bear brook?
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Post by 74nitro2 on Feb 12, 2015 9:04:50 GMT -6
Vintage show. 30th Anniversary NH Snowmobile Club Would have been big event however I fear that the weather will spoil it along with most activities this weekend. Big storm coming Saturday night into Sunday, along with record low's and high wind. Bummer! we have all this snow and you can't enjoy it.   |
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