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Old 07-27-2013, 11:29 AM   #31
sanjoh
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Originally Posted by tonymorr View Post
The CBR250 engine is a HUGE let down. The WR250R engine is WAY better especially with a big bore kit. I already have one of them and it is a great light ADV bike.
Have a crf250l and wr250r in the stable, prefer the honda engine, yammy suspension.

I've got 98 husaberg 400 that the 300 would fit in nicely oh and it is tagged

What's the throttle body config on the 300? Seems to be the biggest challenge with a ptwin in single backbone frame.
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Old 07-27-2013, 04:53 PM   #32
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Originally Posted by sanjoh View Post
Have a crf250l and wr250r in the stable, prefer the honda engine, yammy suspension.

I've got 98 husaberg 400 that the 300 would fit in nicely oh and it is tagged

What's the throttle body config on the 300? Seems to be the biggest challenge with a ptwin in single backbone frame.
Dual throttle bodies. Pretty close together. I can't wait for the engine to get here. I'm going to be all over it with my tape measure. Can't do much till that happens.
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Old 07-27-2013, 09:43 PM   #33
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Add a scale to go along with your tape measure, please.

I'd personally like to see something along the lines of a trimmed down Weber Rally Twin...but whatever you decide to build....
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Old 07-28-2013, 03:04 PM   #34
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Starting to come around to the KTM frame idea. I'm hoping it's something I can make work. Looks like lots of room. no?





I have a buddy that is a superb welder. Maybe he could make up an airbox/aux fuel tank/subframe similar to what inmate DRjoe made





Since the wider engine would probably take up ALL of the space between the frame I would probably need something like this rally style low exhaust.



Which is fine because the oil pan is going to hang below the frame anyway.

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Old 07-28-2013, 03:22 PM   #35
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Originally Posted by Navin View Post
With a good seat and some fabrication luggage won't be a problem. Tanks up to 6.6g bolt on. You'll probably need an external fuel pump with whatever you get.
I was thinking external fuel pump as well, but..... If I use the '08> newer KTM frame I wander if I can get a tank for the injected bikes and use that internal pump. Second thought, might be better to source a readily available external pump. Something I could get in a hurry and on the road if need be. Hmmm
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Old 07-28-2013, 08:35 PM   #36
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There were guys running a common ATV fuel pump for retrofitted FI engines. Maybe a Polaris 650??? Yamaha something... Sorry, I know there was an option, I just can't remember the model it was from.

With some basic skills, the later tanks can probably work on an earlier frame. There are many 1990 up KTMs that have been brought up to date with later generation body parts, including tanks.
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Old 07-28-2013, 08:53 PM   #37
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Originally Posted by Navin View Post
There were guys running a common ATV fuel pump for retrofitted FI engines. Maybe a Polaris 650??? Yamaha something... Sorry, I know there was an option, I just can't remember the model it was from.

With some basic skills, the later tanks can probably work on an earlier frame. There are many 1990 up KTMs that have been brought up to date with later generation body parts, including tanks.
Thanks Navin. I'm glad you're here. This is going to be a lot easier with you around :-) BTW, we have a common friend. Chris aka:sportrider (Super10, KTM SMT, 400, etc). I guess he knows you from track days.
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Old 07-28-2013, 08:59 PM   #38
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Oh yeah, we met last year. Your upstate? I'm on the NJ border. I'll have to take a ride by and see your progress as it advances!

I'll try to grab you the measurements you want tomorrow, though I fear the fairings will block them pretty well. The Ninja 250 intake bells on the carbs are the same diameter/distance BTW. I'm running a 250 K&N pod filter with both TBs in one filter, 2 ports. They are pretty close together. You might squeak them in the rear frame loop of the KTM.

Did you find that KTM engine swap thread?
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Old 07-28-2013, 09:01 PM   #39
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Here it is in case you want to skim it a bit.

http://www.advrider.com/forums/showthread.php?t=757835

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Old 07-28-2013, 09:03 PM   #40
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Oh yeah, we met last year. Your upstate? I'm on the NJ border. I'll have to take a ride by and see your progress as it advances!

I'll try to grab you the measurements you want tomorrow, though I fear the fairings will block them pretty well. The Ninja 250 intake bells on the carbs are the same diameter/distance BTW. I'm running a 250 K&N pod filter with both TBs in one filter, 2 ports. They are pretty close together. You might squeak them in the rear frame loop of the KTM.

Did you find that KTM engine swap thread?
I did. At least I think I did. Also found the thread on adventurizing a 525 EXC. So much info here.... :-)
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Old 07-28-2013, 09:15 PM   #41
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Here is a neat build going the other way. It'll just give you perspective as to how massive the old LC-4 engine was in case you found a donor frame from one of them. I'd only suggest this option if you are a bigger framed rider. These bikes were massive compared to the RFS or later EXCs. Super stout bikes though. I raced a 620SX a few years, strong and stable chassie. Adv 640 stuff should easily attach to these frames. Maybe a blown engine in one out there?
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Old 07-29-2013, 09:14 AM   #42
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I'd really like to see this work out in an RFS chassis. I would have to seriously consider doing this swap myself
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Old 07-29-2013, 09:41 AM   #43
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I'd really like to see this work out in an RFS chassis. I would have to seriously consider doing this swap myself
Just curious, why an RFS chassis? Is it because it is better? More abundant? Cheaper? Or simply because you have an extra one laying around? I'm not totally ignorant to KTM's but I'm not fully up to speed on chassis/suspension changes over the last few years.

Found this http://www.enduro360.com/2010/09/27/...tm-rfs-hybrid/

And this http://advrider.com/forums/showthread.php?t=662808
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tonymorr screwed with this post 07-29-2013 at 09:51 AM
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Old 07-29-2013, 09:56 AM   #44
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I just happen to have a well sorted '07 RFS that gobbles up the nastiest terrain in comfort & handles so well it makes even me look like I'm a good rider. This rebuild already has 200hrs on it & I'll be looking at another complete rebuild in a year or so. Now that I have the mutant ninja finished & have experienced the smoothness of the twin, I would gladly trade a few KTM HP for that kind of smoothness in a package that handled as well as my KTM for some of my rides. I've considered a WRR but they weigh more than my 600cc (now) KTM & would need suspension & sorting out to handle the really rough stuff.
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Old 07-29-2013, 10:31 AM   #45
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I was thinking external fuel pump as well, but.....
why not use the system matched OEM fuel pump?
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