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Old 12-26-2013, 06:06 PM   #16
Clayclev OP
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I most be confused. The block has Rt1 stamped on it and has reeds so this makes it a 73 rt1 360 correct. What is a rt2 and rt3?
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Old 12-27-2013, 07:33 AM   #17
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all the motors were stamped rt1. the rt2 and rt3 have reeds. i believe rt1mx/ rt2/rt3 came with 21" front wheel. the regular rt1 and maybe early rt2 came with 19" front wheel. there's a vin chart somewhere to decode the rt models.

1973 would be an rt3.


more info

http://articles.superhunky.com/4/109

http://www.flattrack.com/index.php?o...c&limitstart=0
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stainlesscycle screwed with this post 12-27-2013 at 07:39 AM
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Old 12-27-2013, 11:15 AM   #18
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Ok that's where the confusion is!! Bike is a 73 rt3. Dumb yamaha doesn't make since they mark it a rt1 when it's a rt3. I just bought a pair of 75 mx250 forks.
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Old 12-27-2013, 02:05 PM   #19
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Originally Posted by Clayclev View Post
. I just bought a pair of 75 mx250 forks.
awesome upgrade. now you have suspension! throw a mx360 top end at it, and a bigger carb(i'm assuming you have a 32 or 34 on there.) /reeds to match that pipe/cylinder and it'll be a rocketship.
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stainlesscycle screwed with this post 12-27-2013 at 03:18 PM
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Old 12-27-2013, 05:03 PM   #20
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awesome upgrade. now you have suspension! throw a mx360 top end at it, and a bigger carb(i'm assuming you have a 32 or 34 on there.) /reeds to match that pipe/cylinder and it'll be a rocketship.
What would be a good choice of reeds. Boysen? I've got the circle f pipe coming. I'm sure that will work.
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Old 12-27-2013, 05:17 PM   #21
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boyesen works. either way you're gonna be jetting quite a bit.
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Old 12-27-2013, 08:36 PM   #22
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I looked into the boysen reeds. They have them for the rt360. $32.50. Will there be any difference for that price?
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Old 12-28-2013, 08:49 AM   #23
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I looked into the boysen reeds. They have them for the rt360. $32.50. Will there be any difference for that price?
sure, there will be a difference - there's always conflicting opinions though... if you plan on swapping a mx360 top end these reeds are probably smaller. if your intake will take a bigger carb (i think your reedcage has bolt on/flange mount carb, and not clamp on type - which makes a finding a bigger carb tougher usually...) a bigger carb for $100 or less would make more top end power than a change in reeds will... a 36mm carb (or maybe a 38) could make a big difference..
i think your reedcage takes 603 reeds - they can be had for about $25 usually. the bigger reeds for the other cage are around $30 (606)

either way you're gonna need to reject both pilot and main for that pipe... i would do 1 step at a time, rejet for the pipe, then install reeds and rejet again for the reeds. changing everything at once is a harder jetting task.. and you can feel the difference each mod makes....
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Old 12-28-2013, 01:34 PM   #24
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As I only race the mo vintage series and 2 arhma nationals a year. I will just keep the rt1 motor with circle f pipe a boysen reeds. I will be getting some work done to the cylinder and I'll have a mx360 head as the rt1 head doesn't have the fin cut out for the circle f pipe. Hopefully these mods will wake up the top end and rev quicker.
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Old 12-28-2013, 01:52 PM   #25
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dt3 and rt3 were tractors.My dt3 had a bottom end to match my mates xl250,it was pretty flat up top,rt3 was the same but with more grunt everywhere
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Old 12-28-2013, 02:05 PM   #26
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dt3 and rt3 were tractors.My dt3 had a bottom end to match my mates xl250,it was pretty flat up top,rt3 was the same but with more grunt everywhere
By what everyone says. I have a rt3. Just confusing when the block says rt1 lol
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Old 12-31-2013, 07:51 AM   #27
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rt1 motor is nothing like the mx360 performance wise.... you could spend a fortune to make a rt1 perform like a stock mx360. but i'm assuming you have a rt3, not an rt1 (you said 1973- rt1 is earlier). rt3 is reed valve..

either way, here are the big differences:
mx360 has bigger carb, internal rotor flywheel, cylinder/porting, head, transmission, counterbalancer (removable), bigger reed cage, better airflow, etc etc. the mx360 makes gobs more hp.
Oh Yeah,the Omni Phase balancer. I had one of those engines sitting here,just the bottom end.

I remember a near 70lb shipping weight,just the bottom of the engine,good lord how can they stuff that much weight in a 2 stroke?

If the OP is winning races against CR500's on a fluffed up 360 enduro,he may not need more power. The handling is a little suspect on those enduros.
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Old 12-31-2013, 12:31 PM   #28
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Oh Yeah,the Omni Phase balancer. I had one of those engines sitting here,just the bottom end.

I remember a near 70lb shipping weight,just the bottom of the engine,good lord how can they stuff that much weight in a 2 stroke?

If the OP is winning races against CR500's on a fluffed up 360 enduro,he may not need more power. The handling is a little suspect on those enduros.
That pic with the cr is a 250. Track was short with lots of turns. Haven't raced any 500s yet.
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Old 12-31-2013, 09:02 PM   #29
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Thumbs down 360 cc, rt1 mx

The only Bike i ever had that would switch over & Run Backwards !
Imagine Climbing a Big Hill, Down Shifting to get over the Top ? Bang !
And Switch-a-Rue , Your now Charging down Hill Backwards !!
We checked everything ?? Timing, Jetting ???
It happened when the engine was Hot ! Not Good !!
Sold that Sucker , FAST !
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Old 01-01-2014, 12:00 AM   #30
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The only Bike i ever had that would switch over & Run Backwards !
Imagine Climbing a Big Hill, Down Shifting to get over the Top ? Bang !
And Switch-a-Rue , Your now Charging down Hill Backwards !!
We checked everything ?? Timing, Jetting ???
It happened when the engine was Hot ! Not Good !!
Sold that Sucker , FAST !
Bahaha. Gotta know how to ride 😂. Can't just go out there and try to be a pantie dropper. You'll it up like this ^^^^^. ✌️
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