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Well you are bleeding it backward to what manufacturers do so........the designer may think you are crazy I know on my bike there is a small ball bearing under the bleeder. Pushing fluid in through the bleeder may seal the ball bearing to the hole There are a lot of posts on this Pull the caliper and press the piston in all the way, clamp it First burp/bleed the master cylinder at the banjo bolt Then keep on going down the line, sometimes holding the caliper above the master will keep air from trying to travel up the brake hose, so you can push the air UP I use vacuum on the bleeder and it will suck the fluid through

I can do it on my bicycle but not the trials bike so well although I know the theory Toss your hips and pull up on the bar, pull the bike over with your outside foot It will pivot on the steering head so you need to tip the bike the way you want the bike to go Like everything in trials, you need to do 10 things at the same time, easy stuff huh

Well I give up, I think it's nuts to say that the carburetor is the best we can come up with, I think carb tech has peaked and its not good enough for tomorrow I'm of the opinion that new tech will happen because it has to, it's called progress points went away and old timers didn't trust "the black box", I bet they poo poo'd the idea of a single shock, the idea of wearing a helmet and pretty much every other advancement mankind has made If EFI and or direct injection has made every other gas engine vehicle then it will make trials bikes better too Lead, Follow or Go enjoy a retro twin shock bike and don't let your opinions hold back developement, some of us like it

Sir Issac Newton where are you now Mass does not change when an object is accelerated or decelerated Again, go drop your jerry can, it won't get bigger as it falls and shrink when it stops It's not gravity that changes just accel and decel so mass is identical but kinetic energy is stored then released when the fluid stops

I'm patiently waiting for someone to reccomend WD40 as an alternate to 2T oil Shhhhh, just let it happen......there is no way to stop this now

You know, that is some of the best finger pointing I have seen to date Thanks for sharing

For the love of God man you must delete this post immediately or it wil go on for weeks of arguing about the proper ratio!! Again For the 3rd or 4th time Save us

Also try just stopping for a split second while riding slow, balance for a moment and then move again, don't worry about getting the steering turned, just stop, balance, move It gets you in the habit of forcing you to balance rather than the bad habit of putting your foot down just because you are not moving, it's as much habit as Anything Matter of fact every time you stop see how long you can balance before putting a foot down I'm not sure purposely stopping and balancing is really important as a junior (like me) but accidental momentary stop without a dab due to an error is very useful even if it only buys you one or 2 seconds

Why don't you try balancing constantly while riding very slowly, keeping the wheel straight and using your balance to stay on line, that way you are not using the bike to balance, you are balancing the bike So when you stop you are not changing from one to another

I wouldn't get caught up in sag on a trials bike, it's not the same

Thanks Cope, Ya I hear you my point was that there is no such thing as an altitude sensor, engines and electronics don't know or care about altitude just barometric pressure It's a different way of answering the same question There are high BAR days at high altitude and vice versa This altitude and EFI thing is so ingrained in the snowmobile world and we have been doing altitude compensating turbo boost control since like 06 or so it really sounds weird to me to hear people questioning the potential of tech that is kind of old news but has just not made it to trials on a significant scale I think one of the problems is that much of EFI is tied up with patents and to use it manufacturers need to buy it or license it so it simply cuts into profit when riders willingly accept carbs Manufacturers only change when they need to and one day it will happen and carbs will fall by the wayside like points and mechanical ignition advance and so many other dinosaur systems

All EFI systems compensate but they don't know altitude They just need Baromatric pressure, engine temp and ambient air temp and throttle position as well as engine speed Motorcycle systems are pretty basic compared to automotive

I have only a couple of issues with Post #69 The compression of liquids, same as the problem with Dad's post, does not happen, that's simple science The only time this changes is in vacuum where the liquids can vapourize The limiter tang has little to do with this, the needle is open or closed, simple as that, like a thermostat, on or off The part about knowledge having something to do do with wether a guy rides or not, the designers and engineers of the space shuttle have never been to space, the designers of F1 cars and MotoGP bike don't race them, many of my mentors were not particularly great riders and many exceptional riders are absolutely useless with mechanical things I do agree somewhat about floats being somewhat erratic due to fuel slosh, most floats are round so that they react similarly to different angles and the float bowl is designed to have the same quantity of fuel in it up to a reasonable angle, but aeration due to impact is impossible to account for

Ya, it's official Pat Smage is freakishly awesome

I don't think liquids increase in density with pressure, then it would decrease in volume as you compress it Hasn't happened on earth yet, it would be like saying fuel volume decreases with cornering or acceleration forces, so what happens when I jump? Fuel volume increases because there is no gravity? Wouldn't humans explode in 0g then?, go drop your jerry can and see if it expands with 0g and suck flat when it hits the ground Is water at the bottom of the ocean thicker? Liquid density does not change as the g force on the float increases, in this case it momentary anyway More like dropping a boat onto water rather than pushing it down A centrifuge is not going to show what happens in a split second shock load so that is junk science And I disagree with "if it ain't broke don't fix it" quite frankly I'm glad all manufacturers DONT do this or we would be stuck in the cave man era Typewriter manufacturers did this, music industry resisted MP3, how about Video tape or audio cassettes Bring on developement

Yamaha used Mikuni "Smartcarb" in 1996 on snowmobiles, there was a host of problems and repeated failures of the solenoids that controlled air flow through pilot and main circuits And we had to rejet cuz they just didn't compensate properly The next model had flatslides and I never heard of smart carb again after that

Overall I really have no problems with carbs and it's good that we can work on them in our home shop but there are more problems with carbs and more running condition issues A modern 4 stroke MX bike has never really existed in this state of tune, the power level is just off the charts and when these engines were carb'do quite frankly they were very very hard to tune and sucked to start and they just changed from time to time, in a way they forced major carb developement be use they were so fussy, EFI made these bikes a lot better Expense is an issue but we can't let this get in the way, manufacturers need to progress, can you imagine if they stopped, we wouldn't have liquid cooling or a descent ignition system or any reasonable suspension, bikes would be 350lbs Heck we would be wearing hats instead of helmets and tires would suck and and and the list goes on I thrive on and I need new and improved or I would quit the sports I love, it's not just trials bikes its boats and sleds and street bikes and ATV,s and so on Bring on bigger better stronger faster and even bold new graphics

Without quoting Dadof2 It's really a generational thing with modern fuel systems, it's progress and some don't accept it well and I bet they ride twin shock bikes anyway, it's like evolution, there are no more dinosaurs or Dodo birds, they didn't make it No normal person I can imagine would purposely remove EFI to put a carb on a bike to "improve it" anymore than he would pull EFI off his vehicle and install a carb, this would be a guy who has no computer, no cel phone, no internet or cable TV, probably heats his house with firewood He doesn't get evolution and he never will The same conversation could be and probably was had about points and CDI but now there are mechanics who don't even know what points are, I have met them and I have not looked but I don't think there is a points conversion kit for anything, if there was it would be on the Internet and the guy who wants it would not be able to find it I can only think of 2 major brands that have done DI on a 2 stroke, one is BRP, anyone name the other without the help of Google ? and I'm not talking about small low volume exotic race bikes

Having worked for a major MC,SM, ATV, OB, etc manufacturer For over a decade I can tell you the answer to almost every question you will ever ask is "Money", the second most popular answer is patent infringement by the way Aside from that Japanese manufacturers focus on making existing inexpensive products cheaper and better, unfortunately they are NOT creative inventors like the rest of the world, so a company like Honda which as far as I know owns Kei Hin will happily sell their EFI systems to all comers In this case Bombardier chose to commit long term to the difficult answer to a difficult questions (Emissions), other manufacturers chose the easy answer which is 4 stroke All manufacturers are subject to EPA but the ridiculous thing is a clean company like (insert brand) can sell their carbon credits to anyone they want so they can make dirty bikes And don't forget Bombardier is a huge company and can amortize developement costs over a lot more units than a small manufacturer can And yes marine and snowmobile are subject to EPA regulation (even weed whackers and chain saws) and marine is very very strict

In my opinion FI is a stop gap for 2 strokes, albeit a long one, face it, it's really just an electronic carb, it's not futuristic and it's definitely not high tech in 2014 If you want to see what today's 2 stroke tech is like look at Ski Doo and Evinrude outboards, I presume that neither of these are very popular in the UK so perhaps many are not familiar Etec is outstanding, never is there fuel in the bottom end to dilute 2 stroke oils, no puddling and no contamination of bottom end and oil with whatever properties today's fuels have (Sulphur) It has been in production in snowmobiles since I think 08 and today the give us The best fuel economy The best engine durability, up to 4 years warranty The best 2 stroke oil consumption The most power in a production 2 stroke @ 164 hp in an 800 twin, that's over 200hp per Litre It does not require a battery And we practically never see them fail Nothing has a harder life than a snowmobile used in the mountains, trust me, if you haven't lived this life then you will have to take my word for it D.I. Is the best thing to happen to 2 strokes since oil injection

A customer years ago complained that his street bike only ran good when it rained, it was blubbery and underpowered, he had been upset about this for 2 years We found his rubber rain booties under the seat on top of the air box intake I never saw him again

Sergio is outstanding isn't he

Conventional wisdom?, I have never heard of that one in my over 30 years in the motorcycle business Wether up or down the cam does exactly the same thing unless there are sloppy parts moving around I would pull it apart and check the shift drum pins and cap, a guy told me his new Beta fell apart Also clutch drag will affect shifting as there is a load on the transmission Easy test is gently load the shifter with the bike running and then push the kill switch, if the bike shifts as the engine stops then clutch drag is making the trans sticky I wouldn't expect to fix it completely, but Dan's clutch plate clean up does a lot for it

The weird thing is that at half tank there is no liquid at the cap, so it's either small amounts of slosh migrating into the cap, then pressure from the tank pushes it out the hose Or large amounts of vapor condensing in the hose But neither makes sense really

People like horsepower so it's a great sales feature However, I'm not sure I have ever used full throttle in a section ............ So I'm not sure if double the power would help me ride obstacles in 2nd gear better