mcman56

Is the tool still available? I don't see anything in the 2018 300RR parts list or service manual. Searching online, I get no clear answer. Although, I see one for a CFR250 is pretty expensive so hard to justify https://www.rockymountainatvmc.com/parts/honda-pgm-fi-setting-tool-p?srsltid=AfmBOoriVL_t6J6WD2_uqMxRoEZDE-ZnbgTGCmcIl9nImw-E11jsmHkL

My question was really related to an XT225 (Serow). The carb is a mikuni and looks similar to the Beta 4t carb so I was wondering if the Beta springs would work in the XT225 to improve response. I have made springs before so that is an option I had not thought about. Interesting comment on the 4RT. I have a 2016 Beta 4t standard model and recently got a 2018 300 4RT but find it harder to ride due to the sharp throttle response. It is difficult to get just a little bit of power and feels like it has about 1/3 of the throttle resolution compared to the Beta . Can the 4RT be tuned to respond more like the Beta? It does have the black throttle tube. I sort of remember options for early models that allowed the owners to tune or maybe load different maps. I'm not finding anything online so is anything like that still available. I know......the solution is to improve clutch control but with arthritic hands and the beginning of trigger finger in my clutch finger that is unlikely.

Has anyone experimented with these? Are the springs intended for higher elevations weaker? Can you get quicker response at sea level or do you just end up with pop and stall? https://betausa.com/evo-4-stroke-carb-spring/

California regulations are a mess and not clear cut at this time. Per CARB (California Air Resources Board), starting in 2022 bikes must meet certain emission standards or they get a competition only registration. Competition only now means it can only be used on public lands for closed course competitions. There are a lot of public lands here, like national forests and state run off road vehicle parks available for recreational riding so that is important. Per CARB the only bike 2022 and beyond that can get a registration for use on public lands is the EM. I talked to the Beta importer a while back and he said that it would not be difficult for their 4T to meet emission standards but the testing cost $40,000 and he did not sell enough to make it worthwhile. I'm sure this cost is now much higher and each model needs to be tested. But CARB does not make laws, that comes from the Department of Motor Vehicles and they continued to issue registrations that could be used on public lands recreationally, not only in competitions. This made it unclear what dealers should do and has not yet been resolved so in limbo. A couple of years ago, I had a run in with a park ranger that thought my bike had the wrong type of registration (green instead of red). He took the VIN and sent it to the Department of Motor Vehicles. Two weeks later, I received a letter from them stating that the bike had been improperly imported into the state. I needed to mail in my title and registration plus get the bike out of the state. I knew the original owner and he thought everything was done properly. California regulations are a mess. Whenever a California politician runs for national office, do your due diligence.

If you live in California, it has its own bizarre laws for off road vehicle registration. When shipping a bike within the US, I have been told it can be much easier and less expensive to partially disassemble and ship as motorcycle parts. Apparently, shipping regulations are different for parts vs entire motor vehicle. Depending on the state, a Certificate of Origin should be adequate to get it titled in your state.

One clean way to remove a pressed on inner bearing race is to machine it paper thin in one area with a carbide end mill. At that point it will crack and slide right off. Careful work with a hand grinder could probably produce a similar result.

The lower legs can be modified to accept standard size bushings.

With light oil and teflon coated bushes in the lower legs, I find the stock TY175 forks to work pretty well.

My Beta once ran the same exact way. It would idle nicely and doing tight turns was fine but if you tried to rev it up, it sputtered rich. I had left a rag in the air filter after washing the bike. You could inspect the air box. https://www.frankmxparts.com/rebuild-repair-kit-MK-BSR33-79-Mikuni-BSR-33-carburetor-2008-2022-Beta-EVO-300-4T-Trial IIRC, that model carb is also used on a 400cc quad. If you search the model number of the carb you should find what else it fits.

Interesting comment. Then, what would be the 4t technique for a basic double blip over a log? I went one tooth down on the front sprocket and that feels pretty good.

I have a 2018 300 with black throttle tube. It looks just like the 2T throttle. Is a slower one available? I have a 2016 Beta 300 4T standard model and the throttle has much more resolution for small blips, maybe 100% more resolution that makes throttle control much easier.

I compared riding position on the Beta 4t to the 4RT and the handlebars were 1" further forward on the 4RT (compared to the pegs). I think this put more weight on the bars promoting the nose feel heavy. 30 mm riser additions brought them back to be more like the Beta. It also looked like the forks had not been serviced in a long time and fresh oil made them perform much better. With these two changes, it feels much better and the nose dive feeling is gone..

Did you measure how much squat was in the back? I added some spring preload to the forks plus more rebound damping to the shock and it feels better. Still, the shock feels stiffer than the forks. This bike has a fork compression damping adjustment on the bottom of the left fork leg. The manul implies it is only effective when the forks are bottoming.

Not as pretty as yours but this should work. Thanks for the details. Do you have a recommendation for a home use hobby level TIG machine?

engine braking - maybe but rolling on and off the throttle in first gear, my beta feels like it has more engine braking