TRX250R.ORG
General => Projects => Topic started by: johnny22 on December 07, 2013, 11:10:41 PM
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So i guess i will finally get going with this motor. It really bugs me seeing it on the shelf everyday when i get home from work. I have a whole bunch of questions because this motor is wayy out of my league. I'll start with getting my frame up to par if thats possible with an oem frame and this motor. Im gonna double up the lower mounts so that they don't break. are those the one that normally break or should i worry about the front triangle mounts also? or anything else with the frame?
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I know Shane ran his Saber in a OEM frame with stock mounts and didnt have any issues.
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oh ok. well when i took my 370 out the other day one of my lower mounts was broken so i figured i might as well reinforce them since im gonna be welding there anyway. right?
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Cool man, is this motor going in the green plastic bike bud.
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Yes sir jamie. I put a lectron carb on the motor just to see if i could clear the frame and all. Is it gonna be a problem that it is tilted clockwise just a bit?
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Most important issues with frames on big bores comes from the cranks not being balanced in relation to the piston. The other frame breaking problem is a misaligned CB gear. Or CB lightened too much. Last but not least is when one mount comes loose and the rest have to take the load.
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Ok so i believe troy said the crank was balanced and by the counter balancer being misaligned do you mean the dots on the gears not lined up? Is there really a way to tell if the cb has been lightened too much?
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Ok so by the counter balancer being misaligned do you mean the dots on the gears not lined up? Is there really a way to tell if the cb has been lightened too much?
Yes the dot alignment. When your bike feels like a foot massager then the vibes are gonna tear the frame apart if the CB is that light. No CB lightening for Puma or Saber. Just 370 and below
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Ok so i'll double check the dots and make sure the bolts are tight. Does the carb normally sit a little tilted with these topends?
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Does the carb normally sit a little tilted with these topends?
I have not got mine yet.
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my carb sits straight up.. is the carb hitting anywhere?
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Hits the cases where the kick starter gear is. Its a lectron carb with a billet bowl
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hmmm... might need to get a cast bowl from CPI
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Ok ill look into those. You're running the billet bowl or cast one?
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cast
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Oh ok so thats probably the ticket then. Do you have a vent hose coming out of the cases under the intake? This motor has one thats plugged
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is it a brass vent tube? i remember seeing some pics of it but i cant recall what it was for?? Nitrous maybe?? I would ask Troy or Dave to be sure.
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Ok i'll ask them It just seemed odd to me that there was a plugged vent.
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the brass/copper looking vent?
(http://i43.tinypic.com/4zw5ep.jpg)
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Yeah the one with the pink hose on it
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Nitrous, or fuel pump... is what I was told.
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Crank is balanced and I didn't have any vibration issues. It was smoother than I thought it would be.
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my carb sits straight up.. is the carb hitting anywhere?
Good to know. So you're running a bigger cast bowl on a Keihin or Lectron carb? What intake boot? I had worried a bigger bowl may cause fitment clearance issues with the case.
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Good to know. So you're running a bigger cast bowl on a Keihin or Lectron carb? What intake boot? I had worried a bigger bowl may cause fitment clearance issues with the case.
The cast bowl from CPI is made specifically for the Honda when running a Lectron. It has a cut out to clear the case.
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The cast bowl from CPI is made specifically for the Honda when running a Lectron. It has a cut out to clear the case.
Interesting. Do they make one for PWK's?
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Interesting. Do they make one for PWK's?
Not that I'm aware of. Not sure a need exists for one actually. The huge cast cowl is not needed until you get into the big Lectron carbs where lots of Alky is needed.
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You can see what the bowl looks like here. It has two fuel inlets and two sets of floats. Hold lots of fuel, but will set you back $200 new.
http://trx250r.org/showthread.php?2011-New-Sabertooth-Topend-PEP-Rear-shocks-and-more!!!!
Can't really see the notch for the case in this pick though. I'll see if I can snap a pic of mine later.
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[ATTACH=CONFIG]2626[/ATTACH]
[ATTACH=CONFIG]2627[/ATTACH]
You can see how the corners cut off to clear the case. Mine still rubs a little due to being a Polonda with a different reed cage welded on and and a custom intake.
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Good to know. So you're running a bigger cast bowl on a Keihin or Lectron carb? What intake boot? I had worried a bigger bowl may cause fitment clearance issues with the case.
Im running the UPP boot and cast bowl on my Cutler carb. Mine clears the case but not by much. The Tyson frame i have was running a Puma with a Lectron carb. But with my Saber and the Cutler i had to cut the shock mount tube and move it back.
(http://i41.tinypic.com/2iv1q87.jpg)
(http://i43.tinypic.com/2qamoug.jpg)
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My Lectron barely clears the cross tube with the shock mount on a stock frame. No way could I fit that monster of a cutler without modify my frame like Wayne did.
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Nitrous, or fuel pump... is what I was told.
cool thanks troy.
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i also noticed that it barely clears the frame with the lectron on there. Its gonna be a tight fit when i go to put the intake on there. What does the cast cpi bowl cost?
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Not that I'm aware of. Not sure a need exists for one actually. The huge cast cowl is not needed until you get into the big Lectron carbs where lots of Alky is needed.
Thanks for the pics and info.. was interested in one on a PWK for big hills.
Im running the UPP boot and cast bowl on my Cutler carb. Mine clears the case but not by much. The Tyson frame i have was running a Puma with a Lectron carb. But with my Saber and the Cutler i had to cut the shock mount tube and move it back.
Good to know Wayne.
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i also noticed that it barely clears the frame with the lectron on there. Its gonna be a tight fit when i go to put the intake on there. What does the cast cpi bowl cost?
around $200 i believe
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Make sure you have enough room between your frame and carb I broke a power jet off once in the dunes and had to move my cross member back to avoid it.