ATCr125x

[onformula1]

Hey your petcock is installed backwards BTW.

Mike better start putting rod to metal, you're smoking him LOL


Sent from my SM-G386T1 using Tapatalk

[Jmoozy27]

Hey your petcock is installed backwards BTW.

Mike better start putting rod to metal, you're smoking him LOL


Sent from my SM-G386T1 using Tapatalk

Thanks to some good advice on machining the gussets and picking up the welder Ive been able to knock some time off of the build. I don't want to rush though. I don't like doing the same chit twice.

[Jmoozy27]

That color combo will look even better with the suspension I planned out.

Killer combo......very jealous!

Sent from my SM-G386T1 using Tapatalk

I've just been thinking about if Honda would have made this trike, '87 would have been the last year. So I'm going to build my interpretation of just that. Plus a white frame in Louisiana wouldn't stay white for very long.

[Red Rider]

Hey your petcock is installed backwards BTW.

Looks like it's mounted properly to me.

[onformula1]

Looks like it's mounted properly to me.

Those CR's will look backwards compared to a trike

The lever goes on the backside facing the engine so it cannot be shut off by your boot they came from the factory that way

No joke

Sent from my SM-G386T1 using Tapatalk

[onformula1]

Sent from my SM-G386T1 using Tapatalk

[Jmoozy27]

Sent from my SM-G386T1 using Tapatalk

That's nice!!! It may be a little early to talk about motor mods but... What would be some good ones? It has a PC pipe, stock silencer, stock intake from what I can see. I don't want to bore it unless I have to. Would the a Vforce reed package be a good idea?

[tecaterob]

Man I'm loving this build. Smaller bike with enough HP. I'm only 5'8 so I love riding small bikes.

Great job man!!!!!!

[Jmoozy27]

Man I'm loving this build. Smaller bike with enough HP. I'm only 5'8 so I love riding small bikes.

Great job man!!!!!!

Thanks!!!

This is my first smoker so I figured I would start with something smaller. Maybe some day I can work my way up to a 500, or 540.

[onformula1]

That's nice!!! It may be a little early to talk about motor mods but... What would be some good ones? It has a PC pipe, stock silencer, stock intake from what I can see. I don't want to bore it unless I have to. Would the a Vforce reed package be a good idea?

These engines are very, very fast!

Are you looking for more?, if so do you want more low, mid or top end? Let me know, I will share I have been building these engines since my first 1986 and back to 1983 on buddies bikes, mild to wild.

Or how about some simple, cheaper mods to tune the engine and fix any issues?

Keep in mind in their day they beat most manufacturers bikes with full race mods- box stock, they are a true pro worthy engine from the factory and competitive today and in the go kart world, right now.

[Jmoozy27]

I guess I'll just wait and see what I think once I take a few rides on it. I'm sure I'll want more power (Doesn't everyone) but not at the cost of reliability. I'll just wait to see which circuit if any needs to be assessed.

[Ol Deuce]

The front mounts are complete. I'll make the top ones tomorrow.

I like the way it sits

This is one sweet build!! The 2nd gen X frame is the best choice for this build !!! Nice nice nice!!!!!

Ol Deuce

[onformula1]

I guess I'll just wait and see what I think once I take a few rides on it. I'm sure I'll want more power (Doesn't everyone) but not at the cost of reliability. I'll just wait to see which circuit if any needs to be assessed.

As always- IMHO

How about more power by fixing issues and tuning- (Pretty cheap too) Plus I can't keep anything stock....Don't even get me started on my old full race lawn mower..LOL, nitro- yeah but don't tell my wife..LOL

The stock intake is excellent, I would not use a RAD valve unless you want more low end and sacrifice everywhere else or I can show you how to modify it to be excellent, but money wise it is still not worth it. I am not a fan of anything V-Force on that motor,,,save the bucks, put it elsewhere you will thank me.

I would use the stock intake with Carbon tech reeds, never the low tension, medium for everywhere, high tension for more top end. (I only run the high tension) $55 bucks the stockers are probably shot anyway. http://www.carbontech.com/motor/honda.html

Make up a carburator T-vent kit, you need X2 brass barbed Tee fittings from a aquarium store (About $3 bucks each) grab 6 feet of 1/8" clear neopreme hose, the best stuff comes from Sudco it doesn't get stiff from fuel. (Not necessary)
http://www.sudco.com/

Make a short line coming out of both carb. vents, then the Tee fitting, then run the lines like normal 3" below the motor, then run lines from the top side of the Tee fittings up and over the carb and back down the opposite sides, zip tie the hoses together with small good quality ties (This mod is important) once the hoses are ran out of the bottom of the motor cut them at a 45 degree angle with the short side facing the axle.

Man, that is tough to explain in print (Let me know if you have questions)

The stock carb. will leak fuel out of the vent lines on jumps, whoops or hitting something hard then it will bog & run rich until the fuel is sucked back into the carb, this mod cures the issue. (You can buy a kit, but the DIY mod is better)

the stock jetting is not good, here is the fix.
Carb jetting-
Supreme unleaded fuel, I like Shell brand
You must run synthetic pre-mix (Unless you love cleaning the HPP power valves) 40:1 ratio. I like Amsoil, Motul or Torco is good as well.
58 pilot
Stock #6 slide
1468N needle which is no longer available from Honda- Here is the replacement for a lot less money.
https://jetsrus.com/individual_parts/017_031_su.html
Main jet 168 (Use only Keihin jets)
Air screw 1.5 turns out
Zero idle for best performance, these engines don't like to idle. (Adjust the choke knob down)

Clutch-
Use Barnett steel clutch plates (Will work better than stock on a trike)
http://www.barnettclutches.com/135/h...da-cr125r.html
Use the stock friction plates, never aftermarket.
Use the stock clutch springs, replace them they sack out $15 buck is cheap insurance.
http://www.partzilla.com/parts/detai...1-KA3-710.html
Use synthetic Dextron lll fluid in the transmission

The stock silencer is very good, but better with mods cut the case down on the backside 2" along with the core, repack the crap out of it hold the wrap down with masking tape and struggle to get it back together. (Drill new holes for the end cap) Excellent, free mod. the best aftermarket replacement is a DEP's (I prefer the stocker)

The stock pipe is insanely good, try to find one cheap.
The best overall pipe is a DEP's
The best upper mid to top end pipe is a Messico (Hard to buy, comes from Italy)
The worst is a PC, and no the factory Honda and/or Peak bikes did not run the PC pipe that the public got.

Only run the stock spark plug (NGK BR9EG) spit in the cap.

Try to run the stock CR airbox and boot, if it doesn't fit fab a air box and use just the air box boot. (Important) Please don't run a pod filter. That engine is tuned to the boot.

If you want more top end send me the carb and I will bore it to 38mm and give you some new jetting specs.

Twin Air makes the best air filters

This engine is very sensitive to power valve tension it must have 2-3mm of tension on the throttle side spring or it will run like crap.

Just keep it a 125, a big bore 144/150 stroker is not needed.

You can re ring the piston 2-3 times if you run good premix.

Mod the intake side of the piston by drilling a 12mm hole (Or close) dead center 10mm below the bottom ring land. (Great mod., cheap)

Mod the exhaust side of the piston by drilling a 1/16" hole 12mm below the bottom ring land, then 10mm below that hole.

Deburr all holes, this can be done on a good used stock piston that is in good shape- stock or Pro-X makes the best pistons (The casted pistons are better than forged)

Polish the exhaust port. (Free, don't hit the power valve guides)

The stock ignition timing is excellent, don't touch it.

Machine the spark plug boss down 1mm, the stock set-up shrouds the spark plug

If you ever find a Bill's pipe, buy it and I will show you how to build a engine that will be so fast it will feel like it is hitched to the back of a 250.

You will now be running clean and at about 38-39HP, a bit more than a 200X! LOL

Let me know if you have any questions.

[Jmoozy27]

Tons of solid info...
You will now be running clean and at about 38-39HP, a bit more than a 200X! LOL

Let me know if you have any questions.

Roger that ol buddy, I'll start collectively acquiring everything now. As for the current setup, if the motor starts once the trike is rideable then I will start from there. I've made the mistake of modding a motor before ever running it and tuning during break in of a new cylinder. Luckily everything worked out but it was a task I rather not do again unless I have to. I want this one to grow with me so I can learn it throughout. Thanks for all of the help.

[Jmoozy27]

I modded the top mounts from the CR and they should give it a nice OEM look