DT125R ARCHIVE

Members Login
Username 
 
Password 
    Remember Me  
Post Info TOPIC: Rm 250 RESTRICTING


Guru

Status: Offline
Posts: 919
Date:
Rm 250 RESTRICTING
Permalink  
 


Hi guys, as you know ive got my BEAST rm 250 that rides like a 125, basically my search for a 125 isn't going very well and trying to sell my rm is going ****e atm... Out of curiosity if i did end up keeping the rm what can i do to calm it the f*** down!?

all i know is the barrel has been ported, its got v-force reeds, and the carb has been up jetted for the pro circuit expanny

it looks like there are 2 gaskets on cylinder base, is this suppose to ease compression?

i want it to be like a proper 250 2, where its got abit of torque and a smooth band, not bog absoloutely nothing them BAM everything topend like a 125

anyone? Just curiosity atm



__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Just grab an orignal RM 250 cylinder and put the jetting back to standard. A barrel shouldn't set you back too much. I bet you will get a lot of money for that ported barrel matey/

__________________

Always Originate, Never Pirate!

The Leviathan Project



DTR Senior Member

Status: Offline
Posts: 172
Date:
Permalink  
 

Getting a flywheel would slow it down if it hasn't got one already?

Or maybe I'm completely wrong...

__________________


Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

It will have a fly wheel. A heavier flywheel will make the engine less revvy. But for motorcross you want a lightweight flywheel to make the revs snappy!

__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

What makes you think its not the standard cylinder cal?

__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Cause you've said it's been ported. When you port a two stroke you shift the peak power up the RPM scale, so getting a standard barrel for it will return the band to its normal place. That's all you would have to do.



__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

Arent the barrel and cylinder two different things? You know what im like with engines cal

__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

No. Same thing.

__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

Where the hell am i suppose to find a cylinder? None on ebay i'll have to go oem but its all from america

__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Mate there will be some about. You just have to look. That, to me, sounds like your best option. You keep the best of both worlds then. The bike you know, with the power you're more familiar with.

__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Obviously get one for your year, but there are plenty here to choose from...

http://www.ebay.co.uk/itm/RM-250-CYLINDER-BARREL-BORE-2000-99-1999-B111-/151657193783?pt=LH_DefaultDomain_3&hash=item234f792137

http://www.ebay.co.uk/itm/Suzuki-RM-250-barrel-jug-off-2001-01-rm-250-needs-replate-/201340574323?pt=LH_DefaultDomain_3&hash=item2ee0d55a73

http://www.ebay.co.uk/itm/Suzuki-RM250-RM-250-Need-Sleeved-Engine-Top-End-Cylinder-Barrel-2004-2005-/181746313692?hash=item2a50eca9dc

http://www.ebay.co.uk/itm/Suzuki-RM-250-barrel-jug-off-2000-00-rm-250-good-lining-has-no-power-valves-/191588513732?pt=LH_DefaultDomain_3&hash=item2c9b90b7c4

http://www.ebay.co.uk/itm/Suzuki-RM250-RM-250-Need-Sleeved-or-Replated-Engine-Top-End-Cylinder-Barrel-1999-/181749360294?hash=item2a511b26a6

Just a suggestion anyway. There are loads of the net. You just have to look.

Bare in mind most of those wanta replate, which is not cheap. That second before last one says it doesn't, but doesn't come with powervalves. You should be able to use yours.

It's more expensive but a replate is 200 so it's actually a cheaper option.



-- Edited by Calum122 on Wednesday 27th of May 2015 08:00:15 AM

__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

Ok cheers for that bud

Yeh i dont know what years fit what, i found this though

m.ebay.co.uk/itm/291472999366

Seems to suggest 2001< are the same?

__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Would seem so. A quick look o the web, or ring up a Suzuki Dealer, or AJSUtton maybe? SHould give the same part number : D

__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

Wait what have i got to do in terms of swapping them over? Is it hard?

__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Literally just new base gasket, new piston, rings, small end bearing, gudgeon pin and then take the barrel off and the new barrel on. On a motorcross bike shouldn't take more than an hour with a cost of about 50. Really simple mate, and if you got a two stroke motocross bike then this is something you should be familiar with as they need to be done after x amount of hours anyway. When racing this would be done like every other if not every race.

Literally, easy. The only thing you can fck up is putting the piston in the wrong way round.

__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

How much do you think a piston would be and is it worth going aftermarket with the piston or just using standard?

__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Mixed opinion on this. If it were a road bike I'd go forged Wossner. Bit more expensive but you get what you pay for. Mx could go Mitaka, be about 40-50. It's not much. Or go OEM. It's all preference. I don't know what the MX lads use. Serious people will swear by a forged piston. A lot of people who ride mx casually will swear by Mitaka. Some will use OEM.

Again, mx you need to change the piston, often and preferrably before it seizes, so I'd be half tempted to go Mitaka with the fact in mind I'd do another one before the end of the season, depending how often you ride.



__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

Allright cheers

So cal earlier you mentioned a replate, does this mean i can get the cylinder/barrel replated to return it to normal? What is a replate



-- Edited by 2strokemx on Wednesday 27th of May 2015 03:14:27 PM

__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

2strokemx wrote:

Allright cheers

So cal earlier you mentioned a replate, does this mean i can get the cylinder/barrel replated to return it to normal? What is a replate



-- Edited by 2strokemx on Wednesday 27th of May 2015 03:14:27 PM


http://en.wikipedia.org/wiki/Nikasil

http://www.poetonaptec.co.uk/

A method of protecting the bore from damage. There are other methods of doing this, DT's for example you have a steel liner in the middle that protects the aluminium barrel. I've seen on higher application motors, Nikasil plated bores.

This method requires no steel liner, instead electrostatically plated bores coated in Nikasil allow you to run a piston on an aluminium bore without a steel liner. Only protected by the plating.

These types cannot be rebored. They are replated. If you damage the bore significantly then it will require welding. If an oversize piston is available then it's possible to bore and plate up.

But read those links if you want more detail.



__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

Is it just me or does that cylinder not look standard on my rm?

image.jpg



Attachments
__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Looks like the same as the ones I sent you mate. As said you've got a v force reed block which is not always standard on bikes

__________________

Always Originate, Never Pirate!

The Leviathan Project



DTR Senior Member

Status: Offline
Posts: 172
Date:
Permalink  
 

If you get a new cylinder, I'll give you a hand swapping it over if you want. Although I'm sure your Dad has done a few piston changes in his time? My 125 cylinder looks a completely different colour to the bottom end as well lol.

__________________


Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

Allright cheers for the offer james im sure my dad kinda knows what to do but whether he wants to or not

m.ebay.co.uk/itm/391153859145

What do you think guys should i get this one? Offer 200 i spose

__________________

Braaaap



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

image.jpg

image.jpg

image.jpg

image.jpg

image.jpg

image.jpg

image.jpg

could have been packed better... Would you say brand new?



Attachments
__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

Yeah mate that's crisp. That's not scratches, they're honing marks. Look allow piston ring seal.

Yeah looks lovely mate.

__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

So with them seals and that that came with it, what are they for? Do you think they are all the seals i need to do the exchange of the other components onto this cylinder? Then i would just need a top end rebuild kit? I can take the seals out seperately and get pics, cheers

__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

They look like the head gasket mate. One for the combustion chamber, one for the coolant jacket.

Still need base gasket, powervalve, exhaust and maybe something else.



__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

Looks beautiful!!

image.jpgimage.jpg

image.jpg

What the hells this heavy little thing?

also, the scratches on top of the piston, does that matter?



Attachments
__________________

Braaaap



Guru

Status: Offline
Posts: 7569
Date:
Permalink  
 

That's the gudgeon pin. The small end bearing sits in there and that goes through the small eye of the connecting rod.

Yeah looking sweet. Notice that Arrow, that needs to face the exhaust port. Don't forget that.

Scratches are fine mate. It won't have any effect.

__________________

Always Originate, Never Pirate!

The Leviathan Project



Guru

Status: Offline
Posts: 919
Date:
Permalink  
 

image.jpg

Old barrel

image.jpgimage.jpg

Just making a start



Attachments
__________________

Braaaap

1 2  >  Last»  | Page of 2  sorted by
 
Quick Reply

Please log in to post quick replies.

Tweet this page Post to Digg Post to Del.icio.us


Create your own FREE Forum
Report Abuse
Powered by ActiveBoard