Honda cr125r

[avtovaz]

Hello again my friends! I dont know if you remember but i got good help on here for information when i was looking for a motor for my kart.

I bought a honda cr125r motor, i think its an 1989 motor, and all seemed to be well with it until recetly.

Well, the kart had a 125 TM motor on it before that was air cooled, i had to remove it as it was too loud for the circuit. When i fitted the honda motor, i used the TM pipe, and im not sure if that was a good idea now.


Even thought the other motor was 125 and read valve, will it make much difference to the size of the pipe? I just cut the clange off the honda one and welded the tm one on!



Does anyone have any idea what power a standard cr 125 has? THe other Tm motors seem to have 35 bhp, and i wonder if im miles away? I am concidering looking for a 250cc motor as size dosnt matter. It just has to be single cylinder.

thanks!

[avtovaz]

anyone????????????!!!!!!!

[Fisty]

have a look here.

https://tinyurl.com/m6n7ee
____________________
Quietly and consistently taking the piss.
TL1000R | Hayabusa | ZXR400 | TL1000S | Bandit 400 V
Fatter and faster than Fret

[avtovaz]

I looked but no one seems to be not much about my kart exhaust on google hence why i asked here.

[Blue_SV650S]

2 strokes are massively dependent on the size, length and shape of the exhaust!! 2-stroke exhausts are basically specifically designed to work in harmony (that word can be taken literally in this sense) with the specific engine they were designed for.

If you have slapped a random (i.e. incorrect for that engine) exhaust on there, then at best the motor will not run right, at worst you could blow it up!!

Your problem will be exacerbated as MX motors are massively tuned with huge porting, making the exacting size and shape of exhaust even more important.

In short, NO - you didn't want to do that did you!!

Can you not weld the proper exhaust back on?

Its the 'expansion chamber' bit that is the crucial bit, the end can bit is of less importance (but still significant).
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The purpose of life is to fight maturity.

[avtovaz]

well, i could do that but the pipe it came with was for a a crosser and id need to cut and weld it maybe 10 places to get it any where near right hence why i went for the other pipe.

If it is that critical, ill give it one more shot then before i decide on going for a 250, they seem to be hard to get hold of anyway!


I have had a look about on google and i cant find the motor power for a cr125, any ideas? top 20's or early 30's would be good.

thanks for your help mate!

[Blue_SV650S]

[avtovaz]

thanks mate ill have a read of that!

I could not find a power figure for the cr, so if it does have early 30's i can tune it a bit i would imagine, and get it up there or there abouts!


I have a keihin carb on it now, but i do have a delotro, but its bigger than my manifold but i also dont know weather to bother or not!


thanks!

[Blue_SV650S]

[avtovaz]

Everytime i start to read that link you sent me someone walk in here and start s talking so, Grr!


THe pipe it is a tuned one, i got the motor from ebay and it was on a kart but it was on the other side of the chassie, and there was loads more room for it.

its the angle at the front that is the problem, its far too wide, it needs to be much tighter on my kart...

Maybe ill be well up there then with that pipe as aposed to this one now!!!


Now sneeking off to try to read it again while no one is about

[avtovaz]

Read it, feck, i need to get htat other pipe on then, the engine does go well, but if it is about 30bhp, then its defonatly down on power as i was at hooton park race circuit and my kart was miles behind the TM 125's.


Any idea what jets should be in my carb?

[Blue_SV650S]

[avtovaz]

[Blue_SV650S]