Put 70mls of oil in for 5litres of petrol. This may sound a bit lean if your use to motocrossers but you don't tend to rev trial bikes like motocrossers. It certainly shouldn't sound as loud as a CR. Certainly worth looking at the packing. Phone lampkins as they sell pre-formed packing which you just pop in. Hope this helps. gareth
Definately sounds like one of the jets. Clean out the pilot jet especially well. If you've got an air compressor blow it out with air from that. If you haven't you may have to resort to more crude methods like using a bit of wire. I know people may slate me for saying using a bit of wire but we don't all have fully equipped workshops at our disposal. go delicately as the bore on some of these jets are tiny. If after you have cleaned up the carb and it is still not running unless the choke is on then it may be the crankseals are sucking air in and need replacing. Make sure your airbox isn't clogged up too. let me know how you get on.
They've tried to copy a mini majesty frame. Doesn't look that bad a job to be honest. I don't know whether the original mini majesty's had an altered steering angle though ?
Just wanted to hear peoples thoughts on them before I go and order a whole outfit. Seems a good price is it good quality ? I've got big hands and was wondering if anybody has tried on the XXL glove size too ?
Hi there. Am planning to re-pack my rev 4 silencer. I've allways used the stringy loose type packing on my two strokes but this is the first time I've re-packed a four stroke silencer. Is the stringy loose stuff any good for 4 strokes ? Any thoughts ?
Would like to get an air compressor to sit tubeless tyres on the rim. The guy in the garage across the road from me is sick of me using his. What size i.e. hp and cm3 air compressors are people using ? I realise that you need quite a whack of air to seat a tubless tyre.
I'm about to buy bar risers for my 08 Rev 4 as I am six feet 4. Are the standard bars the same diameter as 'fat bars' ? I've tried measuring them and they appear to be 28mm. I definately have the standard bars as they have beta written on them. Don't want to get the wrong diameter as the risers wont fit. Anybody know the diameter ?
thanks guys. I will try dropping the triple clamps a few mm and see what happens. Quick job so it won't take aminute to put back if no improvement. It could just be the fourstroke effect which I need to get used too.
I have recently bought an 08 rev 4. I had a 04 rev 3 for years and am use to riding Beta's. I can't help but notice that sometimes when I want to turn, the bike seems to carry on and the front wheel just slides. It seems to do it to a far greater extent than my Rev 3. Is this understeer or oversteer and is this caused by my fork hieght in the triple clamps ? I am sure it should grip more than this as I have an almost new front tyre, I'm not going too fast and I'm an average rider. The distance from the top of the triple clamp to the top of the fork leg (excluding the fork caps) is 4mm. Or is it simply the effect of a four stroke engine and the supspension is set up ok. The front forks are set pretty much in the middle in terms of hardness and rebound. Any advice much appreciated.
Hi guys. Thanks for all your advice. Did a mammoth internet search this evening and found this universal gaurd which i have ordered. It is a DRC Exhaust Heat Shield Protector. Google it and see what you think. Should fit nicely as the beta pipe is 28mm diameter. Only
Hi there. Does anybody know where I can get hold of an exhaust gaurd for my front pipe of my four stroker. Both BVM and saunders have both sold them but now have no stock and sounded unlikely to get any more. Have searched all over the internet and no joy. It's bloody dangerous without one. May have to get the oxy acetelene gear out if I can't source one and braze on two nuts so that i can fix some type of gaurd to the pipe. Anybody got any ideas ? Would rather not weld / braze the pipe as the heat will damage it's protective coating.
If the problem is acute in onset you may have dented the fork slider. This will certainly make the action of the fork very stiff and may even make the slider stick on the leg. A bent fork leg may give a similar stiff action. Why not take off the wheel and compress each fork seperately and see which of the fork, or maybe both, is causing the problem.
Right then. I have just started to strip the bike down. There is a carb breather going from the top right hand side of the carb and it goes up the frame of the bike towards the fuel cap. Then there is a pipe coming from the left hand side of the carb down to a t-connection. There is a short tube and a long tube connected to this t connection but the short tube is not connected to anything and I am sure it should be. The long tubing from the t connection appears to be going down to the swingarm which is where I imagine it should go. Am I right in thinking that the short end goes to the black plastic elbow which is on the right hand side of the carb. Currently this black plastic elbow doesn't appear to be connected to anything so am I correct in thinking this has come loose from the short tube from the t connection ? Also could this be a cause of my backfiring ? Finally at the front left hand side of the carb just above the float bowl there seems to be a hole which I am sure may house another plastic elbow which may be missing. Should it have anything in it or is it supposed to not have anything coming out of it ? Your help would be much appreciated. Gareth
Hi there. Just downloaded the parts diagram from Beta Uk. The page with the carb is so small when i try and enlarge the image it just blurs to the point where it is unreadable. Does anybody have a diagram of the carb and it's various breather / overflow pipes ? Also I saw a thread on this site which showed the direction of all the breather /overflow pipes. Have tried searching for it again and can't find it. Could someone help me find this thread please ? Regards, Gareth
Thanks guys for all your help. I am going to run it through the workshop this morning and give everything a good overhaul. I will silicone the mid-pipe and see if that helps. I wil have a good look at the inlet rubber too.
Is this a normal thing then. When i fired up the bike after washing it there was a bit of frothing between the flange of the front pipe and mid pipe so I suppose a bit of gas could have been escaping / drawn in. Does it dissapate as the bike warms up ?
Just bought an 08 Rev 4. Literally just got it back from buying it. It seems to have a bit of a backfire after it has been revved hard. Is this simply an over rich fuel mixture ? I hold my hands up and say I am tottally new to four strokes. It starts fine. A I said, I have literally pulled the bike out of the van and gave it a good wash. Haven't had a chance to check the colour of the plug or see how many turns out the air screw is. Am I barking up the wrong tree with this being an air mixture problem ? Your opinion much appreciated.
Hi there. Just bought an 08 Rev4. Seen a few threads on this site about gearbox oil. What is the concensus now as to what suits the bike best ? 15/50, 10/40, 10/50 ? Would appreciate your opinion as I like to buy 5 litres worth at a time to save cash and I don't want to buy the wrong one. regards. gareth
Ty175 Gas Tank ?
in Yamaha
Posted
I just sold an undented one on e bay. Sammy miller do lovely one piece seat and tank units