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I'm trying to push this little bike to maximum potential velocity in a generally stock scenario. As a refresher, I've got an '81 C70 with the Dr. ATV Long Duration Power Cam (XR70 grind I believe) and the 88cc jug and piston. Running stock carb, exhaust and intake. I had been running a...

Ive got a curious jetting issue that, as I write this, I suspect may be a needle height issue. I've got an 88cc with a slightly hotter cam in it I've been riding all winter with it just fine, but I've started to notice that going from 95% open throttle to 100% WOT, the bike actually loses a...

Stupid Question on Semi Auto Clutches: Does the clutch wear more when in 1st and sitting at a stop than if you're in neutral? The reason I ask is that the rear wheel definitely spins when it gear even at idle -- not enough to move the bike forward but it does spin with enough force that its...

Will a 4 speed transmission from a '60s S90 fit into a 6v C70? If so feel free to tell me why I don't want to do this. Hal

Is there a calculator for these bikes that will tell you how much your RPM will decrease with an increase in gearing? I realize tire size is a factor (C70 vs CT70) as is the gearing of the transmission itself. I've found gear calculators to compare the ratio if I switch from a 14x36 to a...

I just rode to work on my newly upgraded C88 and while it has not turned this little machine into a crotch rocket, I have to say it does make a decent improvement in the overall performance of the bike. A hair quicker off the line, definitely pulls stronger, and a noticeable improvement in...

Riding to work yesterday and today the temperature was in the low 30s. Overall the bike runs fine, but when riding at WOT the bike seems like it loses fuel and dies. I'll have to pull over and then it will start right back up and I can ride away immediately. At 80% throttle it runs just...

Apologies in advance but this is a bit of a cross post with one of the Yahoo groups but I'm not sure how much overlap there is between this group and the Yahoo C70 group. I took the bike out this weekend for a longer ride -- two 20 mile circuits with an hour rest in between. I'm in Seattle...

I've got a really odd situation that cropped up recently that I can't diagnose. This started recently after I almost ran out of gas, and so I'm suspicious that its gas related, but I'd like someone else's opinion. Starting the bike cold, it will idle just fine but then as the throttle comes on...

I'm doing my clutch, its all pretty straightforward, but what is this "universal holder" that the manual references when loosening and tightening the clutch lock nut? Is this supposed to mean my neighbor? My wife isn't going to fall for that trick anymore. Whatever it is, I need one, its hard...

For the Boise area forum members, is it worth making a trip to Boise Cycle Salvage to scavenge for parts? I'll be out there for work in a couple weeks and am thinking of building in a little time to stop there. Worthwhile? Along the same lines, any other good salvage yards/used parts...

Apologies in advance, I've tried to search for this but the search engine does not like short phrases. If I'm putting a 12v lifan engine in a 6v bike, why not just convert the entire bike over to 12v? Yes it requires a new battery, relays, and new bulbs, but the various switches etc, don't...

Does anyone know where to find a Lifan 110cc complete engine? Ideally electric start but I guess I could kick it. I can find 125cc but most of the 110cc I find have reverse as if for a go cart. Hal

I've got a problem with poor performance in the rain that I just cannot seem to puzzle out. Its a stock '81 C70. Whenever we have a good amount of rain the bike has a tendency to bog down and loose all power whatsoever. It will idle just fine, and in 1st gear I generally have no problems...

Does anyone have a reasonably decent chain case for a C70 Passport? Mine is too bent and rusty and rubs all the time in an annoying way. Hal

I've got an odd issue in that the low beam headlight is not working and used to work just fine. Bulb is not burned out and so I'm at a loss as to what would lead to this other than a switch failure or a broken wire. Am I missing something? It seems like power comes in to the switch on the...

I've been playing around with running my bike with slightly advanced timing. This is on an 81 C70 6v stock bike with low-ish miles. It seems like the best way to do this is to rotate the timing plate slightly clockwise to advance the timing. But I'm reading lots of posts where people are...

Has anyone experimented with ways to increase the airflow to the carb with a stock airbox? Holes in the sides of the airbox? I'm trying to get a little more airflow but don't want to ditch the airbox because the aftermarket air filters that bypass the airbox don't do as well in very wet...

I've got an 81 C70 that in almost all respects runs perfectly. The one issue I struggle with is that about 40% of the time, the bike really doesn't want to downshift into neutral. I either have to really mash it much harder than I should , or i have to toggle into first (or a half-shift) and...

I've been lurking around here for a bit but finally need to come out of the shadows. I've got a bone stock '81 C70 than that I've swapped out the 14t sprocket for a 15t. Bike runs great and cold has 190psi compression. My big complaints are that i don't have enough mid throttle oomph and that...