Four-Stroke

or lack of , as pictured in tmx . i gather a few have had a little play now its here , with the first batch sold out when they get here, why is nobody getting excited or talking about it? whos got one on order? whos been to birketts and seen it?

Can one of the lucky few who have a M4RT describe what changes you or your dealer have made to the bike with respect to the restrictors. I beleive there are three? Are all three being removed? Any pictures or diagrams would be appreciated. And may I wish all of you a great xmas and a happy nerday........ BillyT

Well here we go pros and cons of cv carbs??? in my experience (limited i know)dont take the top off the carb the diaphram goes in about the size of the carb top,but after fuel has been under it sweels to about twice it size and they where about 50 quid ten years ago,so when you trapped it putting it back in and split the thing it cost loads, will the new beta carb need regular cleaning?? i bet it will. i did have a few little tricks for re assy,but will save them for later..

These are some pictures of my Moto Guzzi Special. Based on a Stornello 1969 engine placed in a SWM 1980/81 frame. It's now 244 cc. (original 160 cc). I use it in Classic trials. Kind regards, Arie from Holland

im new to trials and i want to get a 4t bike, but not sure which trials bikes are 4t? will be happy with any replies. thanks bleddyn

hi what oil would be fine for a scorpa 175f? i see they recommend motul 300v fully synthetic, but i cannot get this locally. i take it something like shell advance ultra be fine for this engine as it does not work hard anyway, and i can get it locally....better price too. i want to use good oil, but are some of the recommendations overkill? given it not a race bike.... cheers

Don't know if this has been posted or not, but it's a pretty cool video of the 4T GG in action.

Have followed this whole four stroke debate with interest but one thing puzzles me, why do 4 stroke engines run at a higher temperature than a 2 stroke when they are supposedly better lubricated and have only 1/2 the number of power strokes. Also why are they noisier than a 2t.

i guess they can fit the graffix and release the first batch now

Hi all.... Is there any more news about the 4-mont yet e.g price when can i buy one ? and if when will the be some news? Danny

Hi there. Decided to give the four strokes a bit of a go. I think it would be a good choice considering the forthcoming welsh winter mud fests that seem to plague most events. Was just wondering whether the 08 Beta 4t is better than the 08 Sherco 320 4t. What are their strengths and weaknesses ? I've heard the Sherco clutch is a bit of an on/off situation. I know I have left out Montesa in this comparison but I simply can't afford a recent one.

Hi all. I am trying to build a trials bike using an engine from a 1978 Kawasaki KL 250. This build was inspired by some fantastic pictures posted on this site by Booma.... My problem is, i am not using the same frame he used and am having trouble getting the carb to fit in the frame. My question is... Can i lengthen the inlet manifold? If i can lengthen the tube from the carb to the head by about 30mm it will make fitting far far easier. The problem i have is, i have no idea what effect this will have on the mixture and running of the engine? If anyone has any knowledge of this subject? I would greatly appreciate the help. Many thanks.

i hate four strokes and thats all im gonna say

Wheres that sherco 4t thought they were coming in , in Feb james

Had a look on google to see if anyone had an 06 4rt picture and found a diego bosis 280 special Is next years 4rt a 280 ?

Husaberg Powered Trialer 350cc Husaberg Engine Early Sherco Wheels Custom Frame Works Per. Shock and lots of frustration!!!

why dont 4-Art make a 125 it would be top of the list for all the youths becouse of that nice siclencer note it would be a sell out dont you think.

Got a play on the first one in the US at the TTC weekend! Quite nice! Impressions are,(though quite subjective) quite strong off the bottom, much like the Honda, but will chug down to nothing where the Honda stopps running and spits you over the bars, and still recover with lots of power! After it cought me by surprize and put me on my butt, I respected it a bit more(first to crash it too) after the floater became a flip turn that I was not ready for! Stronger in the lower revs than the 2T 250 I think! Maybe even the 270! After that it seemed to flatten out to a very rideable and linear power much like the 4T Scorpa, which is very linear all the way through the revs, a…

Hi, new rider looking to purchase first trials bike since 1983 and am thinking about a new beta 300 and wondering how many things I can do to soften it even more to enable me to learn without feeling the bike is dragging me along. Narrowed down to Beta 300 or Montesa 260. I will also be purchasing the additional seat so I can use it as a general trail bike. other than a slow throttle and fly wheel are there other things I can do? Initially I’d like it very dumbed down. In an ideal world I’d simply buy a beta 200 but I would like to have the option to ride trails 55 year old with zero bike riding since 2000 and very poor bikes handling skills

Hi 1st off this isn't on a trials bike but I do compete on a GasGas and trials guys seem to be a bit more clued in on engines than the general biking fraternity so heres my problem. I've just replaced the engine on my sons pitbike with a brand new unit re-using the old carb and exhaust, engine is the same type but not same make so may have differnet spec cams, valves etc. The old engine ran fine with this carb and the carb is clean. When you blip the throttle wide open from tickover it bogs down and trys to stall but if you open the throttle a bit more gentley it'll rev quite nicely. Riding wise it pulls fine as you don't really go from zero to full open but the plug …