Power valves in a 2stroke

[RGV250]

Hi all, i know most of u guys own *decent* bikes and dont have a 2smoke like i do, but doesn anyone know or recomend about power valves in my RGV, i want more power already, and this is the first 2 stroke i have owned, so mechanically, i dont know much about them at all.....

[Barrabob]

go and have a look at http://www.rgv250.co.uk I was considering one at one time as a track bike and i still reckon you could build a rippa bike for a small circuit for a reasonable price but reliability is also a issue.

That and i weigh a fair bit more than 70kg but all the info you want on pipes,electronics,high spec angines with high spec heads and powervalves that wont break are on that site and come at a price.

[RGV250]

Cheers, i appreciate that! im not too familiar with all the 2stroke gadgetry... im going to have to learn fast tho, either that, or leave it as is.... wait out my 12 months on restrictions, and just go an get a zx6 or something.... im a shortass , so ride height is something i will have to be looking at.... short legs

[Barrabob]

yeh the 250 is good in that regard, if you have to do a rebuild there are things you can do to improve power output while you have it apart just go through that site and if you clean out the pipes there might be a few kilo and a few horsepowers forth of gunk in there.

[sneakypete]

a little tip i picked up when i had my 250GP bike: a bit of Autosol metal polish and a very very clean rag, take off the barrel heads, and give them a polish and clean. HTH

[Stace]

Hey RGV, Not sure if there is a lot you can do with the power valves to make more horsepower other than make sure they are operating smoothly and correctly as well as make sure any carbon build up is removed. All they basicially do is open up your exhaust port at higher RPM to allow the exhaust gas to escape guicker thus improving top end mumbo and then shut off to create more back preasure at low RPM to improve bottom end power. So basicially just make sure they are operating smoothly and are as clean as they can be, Be carefull when removing any carbon build up not to let it get into places it shouldn't be

Another tip i found with MX is the better quality oil you use the less carbon build up. I used to and still do use Motul 800, It's expensive but i can not complain on the condition of the engine when its been time to pull it down.

Before you get sick of reading it might be worth considering a top and freshen up? Not sure how long you have had the bike or if you know the last time it had slugs and rings thrown in it but it could be due?

Oh one last thing, I am pretty sure the RGV Powervalves are operated via servo motors as opposed to being mechanicially driven like the earlier MX bikes. Usually at start up (ignition on) you should be able to hear the Powervalves cycle once. Check to make sure this is happening.

Good luck mate. Hope this is a little help?

[Gosling1]

Amen to everything that Team Bolt has written.

A couple of things to note:

The reason that powervalves are fitted is to vary exhaust port height. The power curve of a two-stroke is basically governed by the exhaust port height ( amongst other things of course), but exhaust port height is a *major* consideration.

Low port height is *great* for low speed work, and a high port height is *great* for high-speed stuff, and its also very closely tied in to the tuned length of your exhaust pipes....so using a powervalve gives you the best of both worlds........as pointed out above, ensuring that the powervalves are fully clean and carbon-free is a *huge* consideration, they must be able to freely move throughout their full range, in order to work properly.

My favourite book on the subject is " Performance Tuning in Theory & Practice", by A. Graham Bell - ISBN 0 85429 329 9

This book is invaluable if you really want to get your head into 2-strokes and tuning, performance mods etc etc. There are full chapters on porting specs, expansion chambers (exhaust pipes), carburettors etc etc.

One word of warning - don't be sucked into believing that 'Bigger is Better' when it comes to carbies or porting.......this is not always the case, and in fact is often not the case at all......

Happy tuning mate, there is *hours* of endless fun if you really want to give it all a nudge......

[NovaCoder]

Hi all, i know most of u guys own *decent* bikes and dont have a 2smoke like i do, but doesn anyone know or recomend about power valves in my RGV, i want more power already, and this is the first 2 stroke i have owned, so mechanically, i dont know much about them at all.....

Depends how deep your pockets are

There is a company in the UK that make some very nice replacement power-values and barrel for the RGV/RS 250 with respectable price hikes (you should be able to find the details from the UK RGV club).

Also check out TYGA for some lovely bits and pieces.

[Stace]

One other thing to think about RGV is that when cleaning and checking the Powervalves it wouldn't hurt to decarbon your expansion champers as well, They can slowly choke up with carbon as well.

Just something to keep in mind.

Good luck.

[Gold9]

Hey mate,

Bein into the dirt squirters and having done a fair bit of muckin round with the two smokers, I wouold have to say the best option for a bit mor power is to replace you intake reeds with something like carbontech variety, these allow you to choose where your power surge comes in and also gives you a reasonable power increase for your bucks. Operating a bit of a business on the side I can supply these for you for a big saving over what the local boys probly can. But whichever way you go is up to you.......I reckon this will give you the best bang for buck as they say...

[Johnnie5]

as mentioned in other posts visit the RGV website forum and wave hello (maybe not a great idea to mention on the kawasaki forum that i am a Moderator on the RGV forum)

as also mentioned depends on your pockets , powervalves and heads are available

if you dont have deep pockets then take your pipes to an engine reco place and have them acid dipped

fresh piston and rings

all good

[ZZRCHIKKY]

CONGRADULATIONS

i wanted one of them

i love 2 strokes

WINGDING DING DING

[RG]

WINGDING DING DING

Do they have dry clutch on the RGV250?
I know the PGMIV is on dry clutch.

[Gosling1]

WINGDING DING DING

Do they have dry clutch on the RGV250?
I know the PGMIV is on dry clutch.

no, its a wet clutch for these babies......

[Johnnie5]

WINGDING DING DING

Do they have dry clutch on the RGV250?
I know the PGMIV is on dry clutch.

no, its a wet clutch for these babies......

unless you find an SP which didnt come into aus

but the dry clutch bottom ends turn up every now and again