I have the setup mentioned on the title that originally came with 20mm carb. I am upgrading to a 24mm carb and looking for fellow riders with the same set up to help me out with some base line jet settings. I also can't seem to find the rubber intake manifold adapter. There a lot of adapters that read 26-28mm, will one of these work for the 24mm carb??
TB 88 kit w/ Race Head
pitrider42
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Hey taz you know of any 22mm that will bolt on to the tb manifold n work with out any tank spacers?? I know vintage mentioned xr100 carb.. Any other models?
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I'm running a true keihin pc20 on my 88rh & it bogs just like the shengwey. I don't know what the answer is but it's not that. I think maybe mikuni? I've jetted up, down, left, & right & it still will fall flat on it's face if you snap the throttle. I imagine a keihin 22mm will be the same story. I've heard the 20mm responds better to the stroker crank but can't tell you from experince.
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My sheng wey doesn't bog. I got mine set up pretty good. I snap the throttle and the bike stands up. It took me a bit to get it tuned right.
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What jets you running?? Needle clip position?? Altitude?
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I think the carb has something to do with the bog, could be wrong but simply take a Japanese carb and look down it from one side to the other. Is one straight diameter all the way across for the most part. Look at the Shen way...first off its not round(idk if it matters but when I see all the Japanese carbs are nice n round it makes me question this design) and second look at the left and right wall of the inside of the carb. It has some weird notches..
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Well you're one of the lucky ones. I'm about 500ft 04 crf70(88rh/manual clutch) & fmf powercore. Running 90 main, 38 pilot, needle in the middle, air screw according. If I snap the trottle my bike will cut off. If I roll on it does ok. I've got the jets & have been up & down. The norm is you can make it better but never get rid of it.
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I can snap the throttle on my bike with out dying/ cutting out. My problem is when I'm riding and I shift to second gear it's slow of the gear as it goes thru the rpms, it goes really good on the top end but my low end seems to not have the torque or power it should until it gets past 1/4throttle. I run 38 pilot, 92 main, needle clip one lean from center and a/f screw 1 turn out. Elevation is about sea level.
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Middle position. 38 pilot and 90 main I believe and I'm right at sea level.
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Yeah mine pulls good from mid to top but the bog takes alot of the fun out of it.
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The bog is caused by the lack of accelerator pump (throttle valve opens quick, not enough vacuum to pull necessary fuel to prevent bog, engine falls on it's face). An accelerator pump would 'squirt' a bit of fuel into the mix when the throttles wacked open, temporarily rich mixture and no bog.
Seems to me a Mikuni VM22-133 would be about the biggest I would run on an 88. Reduced radius means an improvement on bog (more vacuum means more pull on fuel from main jet) and yet still large enough to feed that intake valve at WOT once it has it's legs under it. Flange style bolt on (49mm between centers) should work mint with most 22 mm intakes. Another thought is to run a longer intake manifold, which will help with low end power / bog.
Seems to me a Mikuni VM22-133 would be about the biggest I would run on an 88. Reduced radius means an improvement on bog (more vacuum means more pull on fuel from main jet) and yet still large enough to feed that intake valve at WOT once it has it's legs under it. Flange style bolt on (49mm between centers) should work mint with most 22 mm intakes. Another thought is to run a longer intake manifold, which will help with low end power / bog.
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What bike is that vm22-133 from?? And is that a bolt on to the tb intake?
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The kit comes with a 38 as the biggest
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Can't tell you what the VM22 was OEM on, but yes, it'll bolt on to a TB intake (48mm center to center mount on flange)
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Hence the reason a 108 runs better with the 20mm then an 88 does. More vaccum.
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Those stroker kits come with bigger carbs, don't they?? I know the takegawa comes with a 24mm carb..
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If you get one the basic kit is just the crank & gaskets. Alot of people run bigger carbs but it seems alot run the 20mm with good results too. I'm sure they give a little top end up but for no bog, i'd take it!
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I see what your saying.
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You can buy a 40.
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