Except it isn't. The 11 that it makes at 5200 is 57% "more than" the 7 it made before, not 67%. If that were the intention, fine. As I said, if trials is the target, it's getting there. One might also say it now makes only 35% of the power it used to at 7300. Cherry pick all you want. What...

What Clarence suggested is prudent. Front sprockets are a lot cheaper than rear sprockets as long as you are not trying to make a major shift in gearing. Assuming you can find a source. My guess is that there is one, but you might have to call around. Perhaps the easiest way to figure out what you n...

Dirty rat, Not to worry. Kaptain Kels clearly has the situation in hand. I should never had cared to offer an observation so the fault is mine. Here we have a process that has so far taken a bike from 14 hp to about 11 (inspirationally close to an Ace 100), inserted what looks like four flat spots i...

Bull.

For what it's worth, since this is a developmental experiment, change only one parameter at a time. Doing the head, the porting, a completely different piston, and a one-off pipe all at once, you have no way to determine what works and what doesn't, or which part of this has increased torque and whi...

What I see is that it used to give you linear power throughout the band, and now it is lumpy from low to midrange with a couple of significant flat spots, and to say it falls off a cliff understates the problem. Clearly nothing you have done so far has helped unless you are building a trials bike. I...

Do you want it to be legal, or look as if it is legal. They aren't the same thing. Personally, I don't care about the legality. Nor do USFS enforcement types know what a true spark arrestor looks like, which in fact is why the stamping is on the outside of the unit. The wording doesn't make it legal...

If someone has to have a positive shut off, they do make deadman devices for MX bikes. I could simply never get the push on/push off switch to actually do that. I had to push the switch anywhere from one to four times to get it to switch from whatever it was to the other pole. This is extremely frus...

Since you have to take it apart to repair it, the leak down at this point will only be for practice.

The one I have I could not tell if it was on or off (same source) and it didn't reliable turn on or off, which is a problem both ways. I now use a simple red push button that is no more than a temporary ground switch. If there is a down side it is that you have to hold it down until the engine is of...

Max,

Are you intending to pack the new silencer with glass? Either way it will have a bark to it, but without, it will be about the same as a straight pipe. Workmanship looks very good. Let us know how it functions.

If you can get a feel for what rpm range your bike likes best, compare that to the speeds at which you routinely travel at constant speeds. When cruising, if you feel it is revving more than is best for performance, dropping the rear sprocket size by one or two teeth may help. But if doing so drops ...

The only thing stock in that Beetle engine was the crankshaft, and then, only because at that time I could not afford a stroker or forged crank. 300cfm Holley, high lift cam, valve springs to match, headers, opened the ports a bit, 1,600 cc kit on the original 1,300 engine. Actually could spin the t...

But it is an extra cost to fix what you don't need to break. Amen. I once tossed a rod through the engine case of a VW Beetle. Okay, so I was doing in excess of 85mph for more than five minutes. Point is, the cases were successfully repaired by helical-arc. Luckily, I had an expert welder just arou...

Using liquid gas cooling is an interesting notion, but not practical for this purpose. After posting that it would shock the bearing to drop it into even a room temp case, it occurred to me that it might also shock the aluminum case. Photo above is case in point. Oops. What I would avoid is an extre...

You would probably have to thoroughly clean and degrease anyway. I don't imagine someone would toss grungy cases into a burnishing medium.

Personally, stock Hodaka.

Liquid nitrogen is used for cryogenic steel treatment, like brake rotors. I would not want to do that to bearings that are, supposedly, already hardened correctly. I would not trust the bearings if subjected to that kind of cold. Not to mention that if you did that and then dropped them into the cas...

That's what I thought going in, but just wanted clarification. I can't imagine making a 250SL harder to accelerate by making the gears taller. It isn't the optimum highway cruiser by all accounts. I would look at it this way: as geared, can I routinely redline the engine in top gear on the road? If ...

From appearances and discussion, ball burnish is the way to go.

Looking for a rear, or a front that is smaller? If you want to gear down, for example for better trail manners, I would look for a larger rear, not a smaller front. Preference is for more tooth engagement.

Measure the bolt circle and shop online. Hodaka may have just picked a sprocket that was already available in the 70's rather than custom engineer one, so the bolt pattern may well match more than one Japanese bike.

Folks selling Hodaka parts on eBay are no different really from others selling old used parts to whatever it might be. Most often, they don't know what they have, they would not know or care if it is still usable, and they use whatever name or word that they think will attract buyers when describing...

Half throttle vanes should be sufficient with a stock sized carb. If you were going to mount something like a 34, I would say at the quarters and half positions. Thing is you can always add more if one on each side proves less than perfect. There is a point of diminishing returns adding extra vanes ...

I don't think it was the carb (entirely)-- it ran too well...... Although the jetting-- needle and slide-- were different, there is an envelope of needle-slide-jet combos will work...... The new carb also had differences in the venturi.......... At any rate, a carb for that model should work out of...