Honda Spree and Elite 50 Forums

Greetings: The Polini (and Malossi...) 47 mm cylinders yield 65cc, not 70. Neither revs high enough without porting to justify a 21mm Carb. 17.5 or 19 is plenty. Amal/Arreche made direct-fit carbs if you still have the stock intake. Otherwise you'll install the Adapter kit from Swap-Shop and I encou...

Greetings: Lots to think about, and I haven't devoted nearly enough time to this subject. Still there's piston height at TDC, BDC, the compression ratio you get depends on the combustion chamber and piston dish, and then port timing that will vary a bit with gasket thickness. Polini and Malossi have...

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Welcome. I believe I speak for everyone when I say we look forward to pics of these vintage beauties.

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I'd need to know the Stock base gasket thickness. You add to that.

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The 19mm .

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Glad you found it. Not too hard to replace?

Greetings: This is in the realm of Alchemy, where trial-and-error determine success. Only problem is you don't have a hundred cylinder castings and cranks to try out like the Factory if the first guess blows up. 44.1 (the "standard" MiniStroke crank from various places...) minus 41.4 equal...

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Your symptoms are very suspicious for an air leak. If you can get to idle, spray something flammable (Carb cleaner?) around the intake manifold, base gasket, head gasket and don't forget the crank end seals. If the idle changes speed you have your leak.

Greetings: Assuming the crank end seals aren't leaking AND the base and head gaskets are good AND your new reeds are sound, I would check the bore. Might be worth a look/cleanout of the intake side too. That compression doesn't seem right unless the cylinder itself is bad or there's a leak someplace.

Greetings: There was a time on this Forum when everyone would cheer for a 28mm OKO. It turns out, the top end might (arguably) be OK, but it was a Bear to tune at idle and midrange. Then Folks discovered that smaller carbs, certainly nothing bigger than a 24 would give just as much top end and be MU...

Greetings: Random Thoughts: Bushings do get worn with time. If the wear allows the shaft to become "diagonal" in the bushing, lube may help but not for long. I'm not sure the parts could be found new, but perhaps someone has a cover assembly lying around? If not, try again with the thickes...

Greetings: I recommend you re-read the suggestions. It's going to require some disassembly to identify. I find it easier to pull the engine from the frame and work on a bench where you're not squatting and cussing to get at fasteners. "Whatever's rubbing will leave a mark..." seems like th...

Greetings: On the advice of Forumista who have been goofing with these little buzzers even longer than I have, I deleted and plugged the pump socket long ago. The addition of extra oil for break-in is unnecessary, and the pump adds a variable that's almost impossible to estimate. If you're pre-mixin...

Greetings: If it sat long enough to fill the crankcase, I believe I spreak pretty much for all the Denizens of this Esteemed Forum when I say REMOVE that random Asian clone and CLEAN THE STOCK CARB. You did a lot of work with that long list of things, and removing and dismantling the Honda stock car...

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Yes Mike, I think the same way. I wonder if the inlet for the bystarter circuit sits up higher. It takes a lot of crank time for the vacuum fuel valve to trickle enough fuel in any case.