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I was thinking an 80cc 2cycle dirt bike engine myself.
I sure wish someone would make a decent intake manifold to mount that 17mm carb. on though, seem senseless to mount it on that small manifold. I'm going to have to get my mig, and pipe bender going again, and come up with something.
Drop the clip down on the needle to raise it for more fuel , that will take the bogging out.
My a55 engine came with a 55jet, after the biturbo, and holes in the air box a 58 is perfect for mine.
Don't bother, I gutted mine , and there's no room for improvement inside, what you need is a new pipe ,and the chamber design.
I run marine synthetic in my Tomos, I've run so long 40mph stretches with my ped, and when I pull the head off on occasion to see if all is well, it looks fine, no scoring at all, looks beautiful in there. I've also run 4stroke car oil in my old GT550 motorcycle when I'd run out of 2 cycle, and that never caused problems either, and that bike was trick,chambers.porting,milled head,e
All depends if your engine needs the extra carb. capacity. If you have a performance exhaust it might take a small increase, if you have a big bore kit , it will probably will need more, or the carb will be restricting the intake flow due to the larger volume of intake charge from the larger cylinder .
That was probably me. The stock muffler has about a 1 inch dia. tube running from about where you feet go, all the way back to the last bolt mount on the shield, then the gases have to go threw two little 1/4 holes to get to the rear 4inches of your pipe, then their is a little wad of steal wool in the corner just sitting there, no gases go threw it though, it much just absorb noise, then the gase
Right on the carb.. If you had a picture of what you have, it would help, it's a little confusing to visualize your description of your setup. Is the box connected to the carb. airhorn, or just hanging there?
Do you have the pipe yet, that's when it breaks loose with speed.
You have to get the idle air mixture right first, then go clockwise with the idle screw that drops the slide down. I'd drive the idle air screw in until it starts to sound crappy and rich, then back it up 1/2 turn(it'll go faster), then do the idle screw to drop the r's down.
This reminds me of growing up. I had a 100yamaha enduro that I took theinjection pump off. I mixed 32/1 for around town, it smoked pretty good so you had to run some r's to keep it from loading up the plug, but it was OK. Then one day I had to take the highway home from work in the rain, so when I got up to highway speed for about 2 exits, the friggen thing seized on me in the rain. I slid do
An observation I've noticed. I took the head off mine after running 300miles on conventional oil, and their weren't any hone marks left in their.I'm used to tearing down motorcycle engines for one reason or another after thousands of miles, and you still see plenty of crosshatching. I'm thinking 300 miles on a small engine like these like thousands on a larger cc engine. I'
You can use a 692282 briggs&stratton exhaust gasket, you just have to snip a piece off the top side of them. I got two from a local lawnmower shop, but make sure you stack two of them like Tomos does.
Only when you get on it from a stop, if I drive normal I can barely hear it over the pipe.
I put a Biturbo, and went from a stock 55mainjet to a 58, which ended up a little rich, so instead of waiting for a new jet I removed the tube in the airbox, and drilled one 5/16 hole at a time in the back of the air box until it was perfect ,14 was still 4stroking a hair, so 15holes was the ticket(36mph) now. I didn't really want to go down a jet size, I'd rather have more air and fuel,
I feel your pain, my bolt on Biturbo for my a55 didn't line up on the rear mounting holes, so I put the head pipe section under my work bench, and tried to pry the bench off the ground to bend the pipe. It friggen worked, but then their was the problem of the mounting flange not been close enough to the bikes pipe mount,but fixed the with a few stacked washers behind the pipe. I mig weld all
Oh yeah, the bottom line, it takes a lot of tinkering around to get it perfect.
I'd put maybe one over stock for that carb., and then put some slow time(putting around) on the new kit before I tried doing any wide open runs to see where the main jet should be. I don't think anyone could get your jetting right over the internet. I put a 58 and a biturbo on my A55, it ran a little rich, and 4stroked at about 33mph. Then I cut the tube out of the air box thinking maybe
I think I'm going to get both the 24 & 22 , and see how it works out for me. My Sprint's engine does vibrate near 30mph with stock gearing, it's like someone tickling your ass with a feather.
I'm running a Biturbo , gutted stock airbox, with a 58jet, and drilled air holes in the back of the box for more air, until it stopped 4stroking. It's screaming at 36mph.
Mine Sprint is piped ,and jetted, and it screams. For those folks that have gone with like a 22 rear sprocket, how much pickup is lost to get the high top end. The bike does 36 as is, so I'm wondering if I should get a 24 rear, or just go all out for the 22 tooth rear. I just don't want it to be too slow off the line by over doing it. What do you all think??
I don't know about Mopeds, but when i was a tech for Kawasaki we used to heat the cases to seat the bearings in all the way. When I worked on jet engines we'd put the bearings in dry ice to get them to fall in the turbine sections fully.
Not getting fuel, you sure the main jet is clean?
You want to nail it down quick? Here's what I did, put the biturbo on, stuck a 58 jet in the carb(sea level though). Opened up the airbox, cut that funny tube out right at the flange, then reassembled the whole mess. next I took it for a ride, it ran rich as heck 25mph. So I came back and drilled 5/16 holes in the very rear of the airbox one at a time testing each hole, when I got the 15 hol
I think I'd pass on that. That Supertrapp design works well on 4strokes, but the tapered chamber and stinger is proven on 2strokes, not sure how a diffuser like that would work.
Mine stock bike does 30mph, but I have the BiTurbo coming soon, and I plan on jetting it if need be. My ?? is, it may be faster with the pipe, but wouldn't it be wise to gear it taller to take advantage of the extra power, hate to just get more speed by screaming the motor faster, but maybe that's what these little bore motors are all about?
Don't tear it down, just do a compression test.
Great, I have a Biturbo, and I hand full of jets ordered for now. I will get this running good, and then when 1977 gets their foam air filter kit back in stock with the main and slow speed jet, I'll jet it again. Thanks