Hey dr_drz,
Thanks for answering my questions. Now I'm looking for a good used RM/KX100 so I can make my own frankenstein bike. Uhm, I mean for my son.

just wondering if you have ridden it yet? I'm thinking of doing the engine mods... Just wondering where the power hit different then stock. thanks olly

that bike is sooooo sick, did you have to tig weld the mounting brackets?

mx221 said:

Thanks and, yes, I did use TIG welding.

dr_drz said:

funny, im in an advanced welding course in school, but im too scared to tey tig

glad to hear it's running so well...thanks for the input

I had a question about how the airbox and airboot fit with the piggyback shock. None of the previous pictures showed that very well, so I took a couple. Apparently, Suzuki had a piggyback shock in mind when they made the airboot. If you look at one you will notice how it bends up and over where the nitrogen reservoir is. You can see that in the pictures.


It fits just fine.
If there is something else I didn't capture very well with the pictures, just let me know and I will try and get a better shot of it.
I am still waiting for the new carb and for decent weather.

Thanks for all of the information about this. I plan on building up my 125L in a similar fashion to survive me (6'2" 230) and then passing it on to my wife when I move on to something bigger when my skills improve (it's my first bike). My question is about the diameter of the RM100 forks. I think I read they were a KYB 36U, I take this to mean they are a 36mm upside down (inverted) unit. So as long as the tube diameter is the same I should be able to use any set of forks with the right length right? Any cross reference info would be great.

Nicely done. I wanna hear the ride report.. Wonder how that thing handles now. Surely the wheelbase, rake, and trail are all a bit different. But, with a .5" rise, it might just work out.

I know the front end swap is easy, as a few of my friends have done it. But that RM100 rear end looks a little trick, especially the rear master cylinder.

w00ht said:

If I understand fork sizing correctly, I believe 36mm is the size of the tubes that slide in the seals (the inner tube), but not the size of the tubes at the triple mount (the outer tube). I am at work right now, so I can't measure them to be sure. I will measure both the tubes at the seals, as well as at the triple clamps and post the sizes.

I had a chance to measure the fork tubes. The inner tubes have an outer diameter of 36mm. The outer tubes, at the triple clamps, have an outer diameter of 46mm.

I finally got the carb upgrade done. First I had to wait for the carb to come. Then I had to wait for some aluminum tubing to make the output shim.

I have never had good success jetting the Mikuni VM26, so I chose a Keihin PE24. I used this model of carb on another conversion project, and it worked well, so I decided to try it here.

Here is a picture of the PE24 with adapters on the input and output side.


The input side adapter was done by a machine shop. I had a few left over from my other project, so I didn't need to make another. I just epoxied it into place over the input side of the carb.


The output side adapter is just a piece of 6061 aluminum tubing with 1.375" OD and 1.245" ID. All I did was cut it to length, clean it up with a file, and epoxy it in place.


Here is what the finished carb looks like in place.


The carb is a great upgrade over stock. The 24mm has 44% more cross-sectional area than the stock 20mm. The jetting is spot on, except for a slight leanness in the pilot. I will have to go up one size on the pilot jet. The jetting is much better right out of the box than anything that I experienced with the VM26. I know that the input and output adapters seem like a bit of work, but the result is much better than the VM.

dr_drz said:

Hey dr_drz,

What jetting are you running in the Keihin?
Main, pilot, needle, needle jet, slide cutaway.
Did you get the carb from Sudco or somewhere else?

Thanks!

ProCycle said:

The main is a 108. The pilot is a 48. As I mentioned before, the pilot is lean. I have some new pilot jets on order. When I am installing the new pilot, I will check out the needle, needle jet and slide cutaway.

I got the carb from Two Brother's Racing. Not the cheapest, I know. However, the cost was about the same as all the various VM26 upgrades (from BBR, or Two Brother's or Powroll). When I find out the rest of the jetting specs, I would think that you could get one for much less from Sudco.

Congrads

After waiting and waiting, I finally got one of the two pilot jets delivered. Here is what the PE24 carb setup is:

Main jet 108
Pilot jet 50
Throttle slide 1SC 3.0
Needle 36S
Clip 3

The needle jet had no markings. Perhaps on this carb all the needle sizing is in the needle and not the needle jet.

If these specifications don't make sense to you, don't worry. This is just a complete list of how the carb came from Two Brothers Racing.

The pilot is still a little lean. I will have to wait until the 52 comes in, to tell if that will do the trick.

Sorry about not having a ride report to share, but it is quite cold around here. I know some people like to ride in the snow, but I have found that it is merely a good way to fall down a lot.

Hey dr drz would you be willing to sell an input adapter for the PE?
How Much

this is a beautiful bike. and around how much was the total cost?

sUzUkim0t0x125 said:

Here is an update to an earlier post:

Here are the costs for the project:

I started with a DR-Z125L with a BBR exhaust and frame cradle. I will not include prices for those. The tires on the RM100 were good, so I did not need to replace them.

2003 RM100 $1,000
Wiseco 61mm piston $110
Bore cylinder $100
Hot cams stage 1 camshaft $140
Swingarm boring $75
All Balls swingarm bearings $44
Galfer rear brake line $50
Rear 51 tooth, 428 sprocket for KX100 $55
428 chain $25
Uni air filter $18
Keihin PE24 carb $270
Carb adapters $30

That's $917, not including the cost of the RM100.

d_whitmore69 said:

When I did my CR80-XR100 conversion project, I also used a PE24 carb. I think that I had 10 made for that project. I have used 2. I would be willing to sell the input adapters for $15 each and cut off a section of aluminum pipe for the output adapter for $5 each. Shipping would be extra.

If you are thinking of using a PE24 carb, try Sudco, I think that they might be far less expensive than Two Brother's Racing, where I got mine.