[xBhp Universal Thread]: Two Stroke (2-Stroke) Problems/ Help Thread

[aalop143]

Originally Posted by satishg

do'nt fix expansion chambers, 90% of these chambers will damage your engine in no time cause what they do is just shifting of power band,sound and looks !! no real performance gain to be frank.RX100 silencer is the best with the muffler restrictor plates removed on a RX35.

get a RXZ clutch cover, it comes with built in hole and retainer screw for the mechanical RPM .but make sure you get all the other stuff and also the cable .they are rare to find.

it is very difficult to find out rxz clutch cover.

[satishg]

Originally Posted by krazyguy

vich is the best cdi unit for 5 speed & how much it cost.

get the RDD digital, costs around 1800

[krazyguy]

Originally Posted by satishg

get the RDD digital, costs around 1800

okay!!!!!!!!!!!!!!!!

[RX88]

keep ur 5speed as genuine as posible if u want to keep it for a long run,reason is it is very difficult to find spares for a 5speed the best performance parts is only genuine Yamaha spares,no alterations bhai !!!!!

[jd666]

Hi all,

As recently posted, i rebuilt my RXZ. The engine is currently running a first oversize, no sleeving, with brand new rings, bearings, oil seals. I wanted to get a big rebuild done by atul, but due to financial constraints that idea did not materialize.

The con-rod and roller bearings have been changed, since there was a lot of play in them.


My issue is, during the running in period, the engine vibrations till 4000 rpm are bearable. But after 4000-4500 rpm, it simply starts resonating.. Well over stating, but yeah the vibrations are far too much...

My query is. Is there any way to balance the crank dynamically with the piston attached??? so that the vibrations are minimum???

We have counter balancing shafts and what not, now that cant be implemented in a RX. But what can be done so that the vibrations are manageable???

I would like an insight from the tuners, as well as the regular rebuilders.



So help me out please.

[Aryan]

Query Merged.

[NitinGirish]

Originally Posted by jd666

Hi all,

As recently posted, i rebuilt my RXZ. The engine is currently running a first oversize, no sleeving, with brand new rings, bearings, oil seals. I wanted to get a big rebuild done by atul, but due to financial constraints that idea did not materialize.

The con-rod and roller bearings have been changed, since there was a lot of play in them.


My issue is, during the running in period, the engine vibrations till 4000 rpm are bearable. But after 4000-4500 rpm, it simply starts resonating.. Well over stating, but yeah the vibrations are far too much...

My query is. Is there any way to balance the crank dynamically with the piston attached??? so that the vibrations are minimum???

We have counter balancing shafts and what not, now that cant be implemented in a RX. But what can be done so that the vibrations are manageable???

I would like an insight from the tuners, as well as the regular rebuilders.



So help me out please.

Visit rdd website. Ron as said he is going to do crank re-balancing using RXK rod. Don't know if thats what you are looking for but check out nonetheless.

[jd666]

^^ but how do you guys get it done??? as in whats the best way to keep vibes to a minimum??? i remember removing and adding lead from the crank of a RD to balance it dynamically. Im looking at balacing it for a higher rev range.

[atul_astro]

The RX crank has no lead weights like the RD crank, and needs to be balanced on 3 sides, that is the web dia, the shafts and finally the threads. Truing the crank is a delicate process and no room for error can be left as excess vibrations can cause damage, such as engine casing crack, or premature bearing failure. plus the motor cannot make power as well.

I personally get it done using a hydraulic press and a couple of jigs with mutiple dial gauges. The trick lies in getting the webs aligned before you insert the pin fully on the press.

In either case, you need to replace the crank, or get it rebuilt professionally using decent rods. Stay away from local MB rods

[jd666]

^^ thanks atul.. a good insight... enough to get me started on researching... i was getting a RX100 brand new crank for 3500 mrp, sept 2009 packaging OEM yamaha. Was really tempted, but before all that, wanted to know if a crank can be brought together in a better way than the one used locally.

Is measuring run out the only way to ensure its balanced right? ( vertically and horizontally?? )