125 Rs & Hp Engine Info

[zwieblekopf]

I'm looking at getting the 125 RS motor you sell.



Would a real daytona clutch cover bolt on?

What are the gear ratios?

What cams will work in the motor?



How does it compare to the 140 and honda port 150 motors?

[PlanetMinis.com]

[zwieblekopf]

anyone?

[T Bolt USA]

you may find more info here

http://planetminis.com/community/top...h-performance/

http://tboltusa.com/store/pitster-pr...rs-p-2547.html

we have some here , but have not yet opend it up

Matt supplied the spec

My guess it they are same spec as daytona 125cc since its made at ZS factory ect

[zwieblekopf]

what is the difference between the RS and the HP other than one is start in neutral and the other is start in gear?

Are they both no slinger motors with the daytona style cover?



that first link has a bunch of other unanswered questions from me

[T Bolt USA]

what is the difference between the RS and the HP other than one is start in neutral and the other is start in gear?

Are they both no slinger motors with the daytona style cover?



that first link has a bunch of other unanswered questions from me

Matt has had them both open , lets see if he will chime in soon

[Matified]

The HP( hi performance) has a slinger and standard cover, start in any gear. The RS(race spec) has the daytone style cover, start in N and slingerless crank. the RS has the same ratios as the Daytona 125, and the HP has the same as the HO, all are basically the same close ratios only a very slight numerical difference.

The HP and RS both have the heavy duty crank connecting rod, the hi compression piston , same large valve /port head,same cam, same ignition.

Both run about exactly the same and will smoke the standard 140 engines!



The stock cams are very aggressive and would not need swapped, these engines are very potent engine packages!

[zwieblekopf]

Awesome thanks for the info, i'm actually replacing a Daytona 125 that the connecting rod exploded on. I really liked it so I think the race spec version is the one

i'm looking for.

[PTECH]

Why not the HP? I hate engines that you can't start in gear!

[taz69]

I am looking at also maybe purchasing one as well...

[Matified]

I will get the actual gear ratios between the two.



But Taz not everyone swaps the basket on the HO engines, because the All HO engines have the 67 tooth clutch basket gear, only the z155 engines have the 69 tooth basket.

[zwieblekopf]

If the transmission on the RS model is indeed the same as the daytona 125 the gear ratios I've found are:

– Transmission: 4 speed (1 down, 3 up).

– Primary Gear Ratio: 18/67 (2.62)

1st: 13/34 (3.1

2nd: 17/29 (1.71)

3rd: 22/26 (1.1

4th: 24/22 (0.91)

From here: Staggs post on TT





And PTECH to answer your question I want the RS instead of the HP because of the daytona style clutch cover and no oil slinger. With all that weight off the crank it revs up much faster, and I'm hoping I can swap my real daytona cover onto it because the one shown on Tbolt's site is ugly compared to the real ones, or even the ones that come on the bigger chinese mills.

[Matified]

RS 125 trans ratio

Primary Gear Ratio: 18/67 (2.62)

1st: 13/34 (3.1

2nd: 17/29 (1.71)

3rd: 22/26 (1.1

4th: 24/22 (0.91)

The daytona cover will bolt onto this engine as well as any other daytona components.



HP 125

Primary Gear Ratio: 18/67 (2.62)

1st: 13/34 (3.1

2nd: 17/29 (1.71)

3rd: 17/23 (1.35)

4th: 20/21 (1.05)



picture of the cam

[taz69]

Thanks Matt agin you the man Yes it was a couple of the older Z155 that we swaped the baskets on.. I run 10in tires and at one track with my 195 in a CRF frame I run 18/33 and its JUST tall enough lol. Any more power and I would be lifting at the end of straight. So the 125RS has 67 teeth on the basket. I will post this engine up over at the SEMRA site see if anyone bites... (Going over 80 on 10s in a CRF50 with a 70 swinger is tricky lol)

[Matified]

No problem,, they are pretty badass engines out of the box, that is why I figured that the cam would be good. These little engine pull pretty good off the bottom , but change into a big midrange hit and pull up into a screaming topend!

[jstn116]

so are you saying that these engines are faster that the 155ho motor?

No problem,, they are pretty badass engines out of the box, that is why I figured that the cam would be good. These little engine pull pretty good off the bottom , but change into a big midrange hit and pull up into a screaming topend!

[Matified]

so are you saying that these engines are faster that the 155ho motor?

Not saying that, but if you are willing to give up low end grunt, and some midrange, they can run with them because of their topend pull is at a higher rpm over the 155. kind of like racing a 125 two stroke vs a 250f fourstroke many people can run theirs on the track at the same time. of course when you add the race head to the HO 155 it is in a completely different level.

[geezer]

Well I got my hands on a RS125. I cant wait to test it out. I luv a high reving motor! I really like that it has a much shorter rod than a 140. Good for high rpm. Ride report coming soon!

[PTECH]

Well I got my hands on a RS125. I cant wait to test it out. I luv a high reving motor! I really like that it has a much shorter rod than a 140. Good for high rpm. Ride report coming soon!

Awesome man I can't wait to hear your thoughts!

[jstn116]

well if what you say is true then I can't wait to put the v2 head on it!!! Do I have to time anything when putting the v2 head on it?

Not saying that, but if you are willing to give up low end grunt, and some midrange, they can run with them because of their topend pull is at a higher rpm over the 155. kind of like racing a 125 two stroke vs a 250f fourstroke many people can run theirs on the track at the same time. of course when you add the race head to the HO 155 it is in a completely different level.

[Matified]

well if what you say is true then I can't wait to put the v2 head on it!!! Do I have to time anything when putting the v2 head on it?

Definitely , when you get that far call me and I can talk you through the process, 801-796-7416 ext 3.