Hi I have been using Repsol moto 4T racing 10W50 in my evo 2010 4t from new, and had no issues to report and had great clutch action without any clutch mods.
No it should be open by design, but we have blocked ours internally and removed the tube that extends up into the carb. This has two advantages, no more fuel loss when fuel is sloshed around in the carb and also cleaning the carb becomes very easy as the bowl removal and replacement is straight forward and you don't need to learn the knack as until learnt it can be very frustrating.
It should have a vent pipe on it but not returning to the carb.
125 evo, it will give you your confidence back, if you start again where you left off you will find that you are riding as a novice and everyone else has moved on and it will feel as if you have to be twice as good to get your bike to do what the modern bike novices are doing with their eyes closed. Ones you have got your skills back and used to the modern style of sections and riding then you could make the change back.
If you filled the rad to the top you will get some steam and coolant out of the overflow, the coolant needs room to expand, once the correct level is reached it should stop. Normally the coolant is just above or level with the cooling fins as you look into the rad, when the bike is cold.
The bp5es is the plug you need, but before you start to re-jet the carb check that tail pipe as you will be chasing you tail if you do the jetting first.
Have you repacked the tail pipe? If not then you will probably find the smoke you are getting is from years of unburnt oil, if the tailpipe is chocked with oil this will also stop the bike running correctly.
You can get a replacement packing cartridge from lampkins for about £15.00 and it's a 5 min job to fit it may sort out both problems in one hit (smoking and running poorly).
Just checked my boys bikes as the plug you mention and also the one I said would help did not ring true, we are using BP5ES as recommended by The UK importer for the UK climate.
The BP6ES will help but you really need to mix your fuel at 70 :1 but better at 80:1 so long as you are using a good brand of oil semi or full synthetic the bike will be more than happy at the higher ratios.
Rev 4T Oil Question
in Beta
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Hi I have been using Repsol moto 4T racing 10W50 in my evo 2010 4t from new, and had no issues to report and had great clutch action without any clutch mods.