Too fat for a 4-stroke?

[IbedaYank]

or you can just pedal to help the motor out going up hills ....

 

[KCvale]

Geared properly you'll be OK...top end will drop as you gear it deeper. Why not try a 79 HF? They're cheap too

The 79cc Pred engines are cheap and powerful (this bike rocked) but the transfer case isn't, this 79cc Prediator with a Q-matic was like $375 and that's just the engine and Xfer case.

The 49cc kit with everything (gas tank, base mount, back sprocket, throttle, etc) is less than that delivered.

I really like that 29" Macargi frame for fitting big engines in and I will be testing it's limits next week as I have one of these 86cc 4-stroke, 4-speed kick start motorcycle racing engines on it's way to try to cram in it.

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Specifications:

Single cylinder, 4-stroke, 2 valves

Bore x Stroke: 47mmx49.5mm

Measurements: 17" x 10 1/4" x 8 1/4"
Displacement: 86cc
Compression Ratio: 9.47:1
Carburettor: racing carburetor
Ignition: CDI, 12 volt, permanent magnetic stator
Maximum Power: 6 hp@ 7,500 rpm
Maximum Torque: 4.25@ 5,500 rpm
Gears: 4-speed, semi-auto, 4 DOWN.
Idle: 1,500 RPM
Final Drive: 14 tooth #420 front sprocket included (we have other sprockets on sale too!!)
Lubrication: 0.8 liters, 10W/30 4-stroke motorcycle oil, pressure and splash
Fuel: Unleaded

Package Contains:

Buyer will receive 88CC Motor, 22MM Carburetor, Intake manifold, intake gaskets, Shifter, Kick Starter, Wiring Harness, CDI, Spark Plug and Ignition Coil.

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$289.95 delivered and already ordered

I already have everything new in the shop to build it out, most of it free because of all the jackshaft and other custom stuff I do and left over parts get saved, so it won't cost me a cent more than the $289.95 for a 4-stroke 4-speed shifter other than the bike cost which is another matter...

I spent all morning surfing the net looking for an ideal bike with good brakes I could mount this engine in with a rag joint left sprocket and came up dry.

That's OK, I can upgrade that 29" $230 Fatal Love with a new front shock and disc brake wheel, throw a C brake on the back to aid the coaster brake, and a seat post shock just for giggles and grins for about the same so I should end up with a kick ass quick and fast comfortable new personal 4-stroke 4-speed shifter ride for under $500.

That would get you around ghandi but don't expect to buy or even build one anywhere near that cost, when I sell it the price will be around $1,400 and worth every penny.

 

[IbedaYank]

he transfer case receives power from the transmission and sends it to both the front and rear axles. This can be done with a set of gears, but the majority of transfer cases manufactured today are chain driven.[1] On some vehicles, such as four-wheel-drive trucks or vehicles intended for off-road use, this feature is controlled by the driver. The driver can put the transfer case into either "two-wheel-drive" or "four-wheel-drive" mode. This is sometimes accomplished by means of a shifter, similar to that in a manual transmission. On some vehicles this may be electronically operated by a switch instead. Some vehicles, such as all-wheel-drive sports cars, have transfer cases that are not selectable. Such a transfer case is permanently "locked" into all-wheel-drive mode.


now a Qmatic is a belt drive unit that uses a depending on version a centrifical clutch on the jackshaft or a belt tenshioner to tighten the belt between two pulleys not anywhere related to a TRANSFER CASE thats is used to split power between two or more differentials

 

[KCvale]

he transfer case receives power from the transmission and sends it to both the front and rear axles.
{bla blada bla}
.. belt between two pulleys not anywhere related to a TRANSFER CASE thats is used to split power between two or more differentials

Call a 4G or Q-matic a firg'n transmission if you want, it's a frigg'n CASE that reduces output RPM and TRANSFERS it to a useable chain sprocket but has no gear changing ability so I don't call it a frigg'n transmission.

Now this 86cc 6HP 4-stroke I got in yesterday has an actual 4-speed TRANSMISSION in it and I call it such.

Here are a couple of pics comparing it to a 142F without the 4G TRANSFER CASE on it.

It's a 100 pound beast with a kick start and it took a lot of looking to find this stretched 26" Electra it would drop in by caring around a cardboard mock-up of the size from store to store, and even that Electra will be tight, and it' wouldn't even fit in the 29" Macargi that 79cc pred is in.

$270 just for the basic bike out the door and it's going to need another $270 for a front shock fork and disc brake plus an additional C brake to help the rear coaster brake and then of course a sprocket, gas tank and throttle but that's about it.

 

[IbedaYank]

You say you run a shop but yet you have no tax id nor do you have a legitimate place of business. Commercial can not be run out of residential zoned property so your nothing more then a guy who thinks he knows it all. I feel sorry for the people uninformed enough to buy your halfassed crap. Ever figure out how lipo batteries are rated yet? Watts or amp hours and you claim to be such an Ebike expert!!

 

[Sidewinder Jerry]

KC its my opinion judging from advice given and the many builds you posted pictures of; you're an innovator not an inhibitor. Keep up the good work.

 

[Old Bob]

You say you run a shop but yet you have no tax id nor do you have a legitimate place of business. Commercial can not be run out of residential zoned property so your nothing more then a guy who thinks he knows it all. I feel sorry for the people uninformed enough to buy your halfassed crap. Ever figure out how lipo batteries are rated yet? Watts or amp hours and you claim to be such an Ebike expert!!

Actually if your business is an extension of your hobby in a lot of states you can run out of your house.You also have the option of getting a variance.Its done all the time.
Sorry but your the one with half assed crap in this case.

 

[Fabian]

Am I too fat for a 35cc 4-stroke engine on my bicycle? I weigh 240 lbs, and I'm afraid to admit the unthinkable. Could I actually need a 2-stroke instead of a 4-stroke?

Even a person who weighs 180 lbs is too fat for an anemic 35cc 4-stroke.

 

[Sidewinder Jerry]

I weigh 250 lbs and go up 30% grade hills with a 33 cc engine. Its all in the gearing. Granted I may only be doing 8 mph but I do get up them. My 5 speed setup range has reductions of 45.83-21.57:1.

I will say I've got a Honda GXH 50 I plan to change out with the RS 35. The Honda has a much higher torque. The new reductions will be 37.5-17.65:1. I plan to make a gas electric with the RS 35.

 

[Fabian]

I weigh 250 lbs and go up 30% grade hills with a 33 cc engine. Its all in the gearing. Granted I may only be doing 8 mph but I do get up them.

Oh hush now LR. Of the 4 points that are listed above, i believe on 3 of them: 250 lbs [and...] 30% grade hills with a 33 cc engine.
the 4th listing of 8 mph is ludicrously over optimistic for a 33cc engine