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Mike Harding

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About Mike Harding

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    TT Newbie

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    any sport especially bikes
  1. Mike Harding

    1984 XR250RE head change

    Thanks for the jetting info I have had lots of plays with the primary carb but the only parts I can get in the UK are the main jets, its really tough taking the twin carbs on and off to just change a jet isnt it. I think the carb slide and body are worn beyond futher use but I may have to try them again. I would still like the single carb option to work and cannot see why it wont, I would guess its got slightly less compression than std head, values dont hit the piston as it did run once, thanks again I will have to get back to it.
  2. Mike Harding

    1984 XR250RE head change

    Hi Guys I bet you dont get many questions from the Isle of Man. I hope you understand the terminology. Bit of a long story,friends twin carb xr going to the dump so decided to save it, replaced conrod,big end, little end, gearbox bearings etc. Ran ok but carbs all over the place, changed jets needle heights all over the place but always had a big bog even when trying to pull off from stationary, would start from cold and run fine until warmed up then bog would appear, very hard to start when hot. In the meantime replaced all rockers and sub-rockers and added a 1mm o/s Wiseco as bore was a bit worn as well, still the same, gave up !!! Now the problem - I have put on a single carb head, looked and measured the same just combustion chamber slightly different, used a carb off an XL250, still RFVC motor and exhaust headers. Will it go no chance, i got it going with easy-start so mechanically ok but will not go any other way. Has anyone else put single carb head on twin carb motor ? Help!!!!!