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[Group] YAMAHA RXZ

supafly

By supafly
in Naked/Street Bikes

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Thanh-BKK Newbie

Thanh-BKK

Posted
Posted
i'm actually making an order for a 165cc racing cylinder kit made for the rxz. anyone interested?

 

it includes:

165cc block

piston & rings

piston wrist pin, clips

head and base gasket.

 

No modifications required just put it on your rxz and be prepared to fly

 

Hi.

 

With that your are moving towards "super short stroke" - the piston speed will be very high and the imbalance will be very high, too. Also you are getting into the grey area where the YEIS system (boost bottle) may stop working - it's volume is calculated to support 135cc displacement but it still works at 150cc short-stroke..

 

I was told the max. displacement that can be reached with an original RXZ block (by boring it up and using a bigger liner/sleeve) is 180cc, using a specially modified piston from some Kawasaki. This would be ultra-short stroke, the YEIS needs to be either disabled or re-calculated (need bigger boost bottle).

 

The piston has to be balanced or your con rod bearings will be destroyed quickly.

 

Also with such large increase in bore the top block HAS to be adapted - the combustion chamber will otherwise not perform and you are giving power away, risking a pinking engine run as well.

 

RXZ block can be simply bored to accept RXK piston, no modification to such piston is required (weight, if original, is same as RXZ piston!) and that gives 150cc. I am riding one such in daily commute.

 

Best regards.....

 

Thanh

Zundapp: ZR10, ZR20, ZX25, ZE40, CS25, CS50, C50 Sport, SpoCo 515, SpoCo 517, GTS 517, GTS 529, KS50 Supersport-TT, KS50 Watercooled, KS80, K80, KS175.

Hercules: G3, MF3, HR2, MK2, Supra 4 GP, K50 RL.

Kreidler: Florett RMC.

Puch: DS, M50 Racing, Cobra 50-6 GTL Export.

Honda: MB 5, MTX 80, CB 250.

Suzuki: RV 50, X5-200, RGV 250.

Yamaha: DT 50-M, VRR 150, RXZ 135 (x2, current)

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adesmond2
adesmond2

yes.. it's illegal.. 😂

Posted Images

Rizuan91 Newbie

Rizuan91

Posted
Posted

Hey RxZ peeps. I need to enquire certain things about RXZ. My friend rode an RXZ and when he throttle to RPM 4-5 at any gear, the RPM will go down/ die down despite maintaining the throttle there.

 

Any solution for this? I tried the idle setting and there seems to be no change despite setting it higher.

 

Another problem is that sometimes after about 30-45minutes, it feels as though his engine there is burning as we can smell 'burning' overheat there. Those smoky smell. I cant seem the find the reason behind this. =/

alep20 Newbie

alep20

Posted
Posted

RXZ block can be simply bored to accept RXK piston, no modification to such piston is required (weight, if original, is same as RXZ piston!) and that gives 150cc. I am riding one such in daily commute.

 

Best regards.....

 

Thanh

 

Hi Thanh

So does using a rxk piston give u any problems?what are the benefits and disadvantages??i heard some rumours that using Rxk piston is prone to piston jam..is it true??thanks:)

Thanh-BKK Newbie

Thanh-BKK

Posted
Posted

Hi :)

 

I have done so far 23,000 kilometers with mine and no problems at all. It is RXK piston 1.25 oversize. But there is noise as is typical when using a large diameter piston, that's the only downside.

 

I can not say what exactly the difference would be vs. a standard size RXZ piston because my block is additionally also ported, my engine develops about twice the stock horse power and a LOT more torque than stock (am running chamber pipe, too, but stock carb and air box).

 

The "piston jam" thing could be true, as with any engine modification that generates more power it is of course a good idea to increase the 2T intake. In my case, i am running a fully open 2T pump (here in Thailand nobody cares if a bike smokes) and i never had an engine problem.

 

Best regards.....

 

Thanh

Zundapp: ZR10, ZR20, ZX25, ZE40, CS25, CS50, C50 Sport, SpoCo 515, SpoCo 517, GTS 517, GTS 529, KS50 Supersport-TT, KS50 Watercooled, KS80, K80, KS175.

Hercules: G3, MF3, HR2, MK2, Supra 4 GP, K50 RL.

Kreidler: Florett RMC.

Puch: DS, M50 Racing, Cobra 50-6 GTL Export.

Honda: MB 5, MTX 80, CB 250.

Suzuki: RV 50, X5-200, RGV 250.

Yamaha: DT 50-M, VRR 150, RXZ 135 (x2, current)

alep20 Newbie

alep20

Posted
Posted
Hi :)

 

I have done so far 23,000 kilometers with mine and no problems at all. It is RXK piston 1.25 oversize. But there is noise as is typical when using a large diameter piston, that's the only downside.

 

I can not say what exactly the difference would be vs. a standard size RXZ piston because my block is additionally also ported, my engine develops about twice the stock horse power and a LOT more torque than stock (am running chamber pipe, too, but stock carb and air box).

 

The "piston jam" thing could be true, as with any engine modification that generates more power it is of course a good idea to increase the 2T intake. In my case, i am running a fully open 2T pump (here in Thailand nobody cares if a bike smokes) and i never had an engine problem.

 

Best regards.....

 

Thanh

 

Thanks for the reply Thanh,btw what do u mean by RXK piston 1.25 oversize?i thought RXK piston is size 2.00,the largest bore our block can hold???

MaverickRD Newbie

MaverickRD

Posted
Posted (edited)

Hey zeckers... sorry to drop in un-invited...

Just would like to inform everyone i have a pair of showa shocks for sale.

check this out

SHOWA SHOCKS

thank you...

Edited by MaverickRD
It�s always, "Which tyre is good on WET?" Why not ask, "Which road is good when WET?"

 

"My Ride, My Pride"

Thanh-BKK Newbie

Thanh-BKK

Posted
Posted
Thanks for the reply Thanh,btw what do u mean by RXK piston 1.25 oversize?i thought RXK piston is size 2.00,the largest bore our block can hold???

 

Hi.

 

The largest bore our blocks can hold is something resembling a full 180cc displacement..... RXK is already quite much larger than an RXZ with 2.0 oversize :) RXK piston gives 150cc displacement...... and of course RXK, too, starts with 0.0 and goes all the way to 2.0 in oversizes, in increments of 0.25.

 

If your already bored your block to 2.0 oversize for RXZ and want to keep your block, next you can bore to 0.0 RXK.... giving you 150cc. Then you can continue running it that way and bore again until you reach 2.0 for RXK.

 

After that you'll have to replace the liner/sleeve and start over at 0.0 RXZ size.... or start experimenting with even larger bores/displacements, however it becomes tricky as the boost bottle becomes insufficient at larger displacements and also the balance will be off. Oh, and it is illegal, too, i guess (here in Thailand nobody cares).

 

Kind regards.....

 

Thanh

Zundapp: ZR10, ZR20, ZX25, ZE40, CS25, CS50, C50 Sport, SpoCo 515, SpoCo 517, GTS 517, GTS 529, KS50 Supersport-TT, KS50 Watercooled, KS80, K80, KS175.

Hercules: G3, MF3, HR2, MK2, Supra 4 GP, K50 RL.

Kreidler: Florett RMC.

Puch: DS, M50 Racing, Cobra 50-6 GTL Export.

Honda: MB 5, MTX 80, CB 250.

Suzuki: RV 50, X5-200, RGV 250.

Yamaha: DT 50-M, VRR 150, RXZ 135 (x2, current)

syamitomo Newbie

syamitomo

Posted
Posted
Hi.

 

The largest bore our blocks can hold is something resembling a full 180cc displacement..... RXK is already quite much larger than an RXZ with 2.0 oversize :) RXK piston gives 150cc displacement...... and of course RXK, too, starts with 0.0 and goes all the way to 2.0 in oversizes, in increments of 0.25.

 

If your already bored your block to 2.0 oversize for RXZ and want to keep your block, next you can bore to 0.0 RXK.... giving you 150cc. Then you can continue running it that way and bore again until you reach 2.0 for RXK.

 

After that you'll have to replace the liner/sleeve and start over at 0.0 RXZ size.... or start experimenting with even larger bores/displacements, however it becomes tricky as the boost bottle becomes insufficient at larger displacements and also the balance will be off. Oh, and it is illegal, too, i guess (here in Thailand nobody cares).

 

Kind regards.....

 

Thanh

 

Oh... I think over here, they won't know till they open up the block and see the piston size I guess. So yeah...

 

Anyway, I've been runnin my Z wif a really, REALLY oversized piston and they hav yet to catch me. Tis tis the pic of my piston before placing it in my block...

 

Massive Piston.jpg

 

... Yeah, I think it's size is 999.75 and u need a crane to hoist it in. Almost to it's max size alrdy...:angel::p:faint:o_O:):cheeky:

http://i330.photobucket.com/albums/l417/syamitomo/GroupPhotoMain1.jpg

wantongkol07 Newbie

wantongkol07

Posted
Posted
Oh... I think over here, they won't know till they open up the block and see the piston size I guess. So yeah...

 

Anyway, I've been runnin my Z wif a really, REALLY oversized piston and they hav yet to catch me. Tis tis the pic of my piston before placing it in my block...

 

[ATTACH]150828[/ATTACH]

 

... Yeah, I think it's size is 999.75 and u need a crane to hoist it in. Almost to it's max size alrdy...:angel::p:faint:o_O:):cheeky:

 

haha. this one ship engine piston siol

Class 2B - 16 Mar 09 (1st attempt)

Class 2A - 24 Aug 10 (1st attempt)

Class 3C - in the process

KRR(Monster Energy) - 25 Mar 09 till 18 Sep 09 FBB1825X (Memories... Alice)

KRR(Emma) - 19 Sep 09 till 25 Mar 10 FT2361T

RX-Z(Mia) - 17 Mar 10 till 17 Dec 11

KRR(Narnia) - 24 Dec 11 till forever and ever untill when when

syamitomo Newbie

syamitomo

Posted
Posted
any of you guys here removed your chain before? i scared i will break the connecting pin for the chain. any advise?

 

I hav once removed my chain before. Using a bike chain cutter/breaker tool to push out the pin in other to join a few more chain to make it longer. Prob is, The chain cutter is meant to on push out the pin and not to connect it back. I hav to use my bicycle chain cutter in other to push the pin back in and yeah, it works just fine now. But sad to say, my bicycle chain cutter, not meant for heavy duty, took the brunt of it and the guide broke...:faint:

 

My advise is, if it's anythin got to do wif chain, go to ur prefered mech and let them handle all the dirty job... ;)

http://i330.photobucket.com/albums/l417/syamitomo/GroupPhotoMain1.jpg

kewacks Newbie

kewacks

Posted
Posted
any of you guys here removed your chain before? i scared i will break the connecting pin for the chain. any advise?

 

I always change my chain myself. So far no problem.

 

what grade of eo you all using? currently im on 10w40, which is recommended for rxz?

 

For 2-stroke bikes, 10w40 is recommended.

Izammo Newbie

Izammo

Posted
Posted

My advise is, if it's anythin got to do wif chain, go to ur prefered mech and let them handle all the dirty job... ;)

cause im planning to take out the chain and soak it in kerosene to clean it thoroughly, rather than brushing it as usual. haha. try something new..

 

I always change my chain myself. So far no problem.

 

 

 

For 2-stroke bikes, 10w40 is recommended.

 

how do you take out the pin? using pliers?

SlowButSteady Bro Newbie

SlowButSteady Bro

Posted
Posted (edited)

FJ plate with new catalyzer fairing wanna join can?How much for the front oversize disc brake cost here and MY?Need to upgrade brake pad or not?Fork stabilizer bracket how much?Any tubeless 100/80 rear tyre size for 18 inch RXZ sport rims?How much?Thanks in advance.Plus if road tax expired in August 10 while the insurance around april 11 how?Any bros wanna xchange front 17inch LC 125 type sport rims with 18 ones?

Edited by SlowButSteady Bro

Klass 2,3,4 i shiny Professional'noye litsenziya

 

1993:Class 2B-Yamaha RXK/RXZ/TZR125RR/SDR200/WR200-Aprilia RS125R-Kawasaki KRR150ZX(Former)

2000:Class 3-Honda Civic 1.6esi(Former)Proton Exora 1.6Turbo(Current)

2004:Bus Driver Vocational License

2009:Class 4

2011:Class 2A-Aprilia RS250-Honda CB400SF PB1-KTM250EXC(Former)Yamaha XJR400R(Current)

2013:Class 2-Suzuki B-King 1300(Former)

eFzek17 Newbie

eFzek17

Posted
Posted

Just trying my luck here. Any of u guys wanna scrap ya bike by this month? Pm me. Kos I may want the number plate and I will fork out for the scrap fees. Pm me ya

boi_s Newbie

boi_s

Posted
Posted
Just trying my luck here. Any of u guys wanna scrap ya bike by this month? Pm me. Kos I may want the number plate and I will fork out for the scrap fees. Pm me ya

 

whats wrong with your plate no. ?

wantongkol07 Newbie

wantongkol07

Posted
Posted

bros, what happens if we haven finish running and we like go faster than 80km/h and doing alot of high revvings? Eg. dragging the gears and all. thanks in advance.

Class 2B - 16 Mar 09 (1st attempt)

Class 2A - 24 Aug 10 (1st attempt)

Class 3C - in the process

KRR(Monster Energy) - 25 Mar 09 till 18 Sep 09 FBB1825X (Memories... Alice)

KRR(Emma) - 19 Sep 09 till 25 Mar 10 FT2361T

RX-Z(Mia) - 17 Mar 10 till 17 Dec 11

KRR(Narnia) - 24 Dec 11 till forever and ever untill when when

SlowButSteady Bro Newbie

SlowButSteady Bro

Posted
Posted

Then stop doing that ie dragging and excess speed of 80 during running in.Best is try to pour some 2T into the fuel tank once weekly.Its okay to exceed 80 but have to slow down.

Klass 2,3,4 i shiny Professional'noye litsenziya

 

1993:Class 2B-Yamaha RXK/RXZ/TZR125RR/SDR200/WR200-Aprilia RS125R-Kawasaki KRR150ZX(Former)

2000:Class 3-Honda Civic 1.6esi(Former)Proton Exora 1.6Turbo(Current)

2004:Bus Driver Vocational License

2009:Class 4

2011:Class 2A-Aprilia RS250-Honda CB400SF PB1-KTM250EXC(Former)Yamaha XJR400R(Current)

2013:Class 2-Suzuki B-King 1300(Former)

wantongkol07 Newbie

wantongkol07

Posted
Posted
Then stop doing that ie dragging and excess speed of 80 during running in.Best is try to pour some 2T into the fuel tank once weekly.Its okay to exceed 80 but have to slow down.

 

what will happen if i continue to do that uh bro? like something will happen to the piston etc?

Class 2B - 16 Mar 09 (1st attempt)

Class 2A - 24 Aug 10 (1st attempt)

Class 3C - in the process

KRR(Monster Energy) - 25 Mar 09 till 18 Sep 09 FBB1825X (Memories... Alice)

KRR(Emma) - 19 Sep 09 till 25 Mar 10 FT2361T

RX-Z(Mia) - 17 Mar 10 till 17 Dec 11

KRR(Narnia) - 24 Dec 11 till forever and ever untill when when

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