honda gx35 power question...

Yes, break them in right and you will notice a slight gain in power.

jon31592 said:

Its on a DAX friction drive and everything is mounted correctly. Also its a brand new engine.
The problem is that it seems to be lacking some power as I can only get it up to 23 MPH at wot. I'm not a big Guy either, only about 140. I'm running the 1,25in roller. I should be able to hit 25 without having to go wot...

Could it be that this is a brand new engine and just needs to be broken in? Who else out there has a gx35?

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A GX35 redlines at 7800 and they will rev much higher.
Check the valve adjustment.
How hard are you pushing the roller on the tire?
Should only depressed into the tire so it doesn't slip.
what kind of tires are you using?

A 1.25" roller at 7800 rpm = 29 mph
If you are going 23 mph you are only at 6200 rpm

Get a TTO tachometer. I have one on my FD 35cc Robin Subaru.

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Yes, I was commenting specifically about those engines, great little motors, smooth, quiet and reliable as all get out, and they benefit from a proper break-in and initial oil changes. They'll not be speed demons, prolly around 24-25 is tops with a 1 1/4" direct drive and cruise around 15 to 18 mph, heck that's plenty fast enough anyway and pretty generous from a motor with a piston diameter the size of a fifty cent piece, lol.

Edit: Honda recs valve adjustment after 200 hours IIRC

jon31592 said:

What was your robins first few rides like?

I don't know how to check that... Google, here I come...

On a side note, I shouldn't have to check things or anything on a brand new motor should I?

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I bought my Robin Subaru on a Staton FD used with 250 miles on it.
The valves should be fine on a new Honda.

A GX 35 or any Honda motor will not change that much upon "break in"
What kind of oil are you using and how much?

You did not answer any of my questions about roller pressure???
Pushing the roller down too hard or the wrong kind of tire will slow
you down. Also tire pressure.

jon31592 said:

Hehe, I guess I'm just expecting too much of it then, I used to run a HT engine, but stopped due to high maintenance, boy did that thing take off...

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Do you pedal? lol
If you are just sitting on your bike and pulling the trigger it is going to
be pretty slow......
I am not your typical motorized bike rider and I know lots of them from
local rides and my race. I beat all of them through the intersection from
a stop and half way down the block because I pedal.

I like to pedal hard. I love the exercise and I use a 7 speed beach
cruiser that I leave in 6th gear on my 35cc Robin Subaru FD.
I have wide motorcross bars and a set back seat post that allows
for hard pedal action even standing up.
The first few stokes are a little hard but I gas the motor from the start
and the straight bars allow for a lot of down force.

I loosen up bottom bearings and bend set back seat posts. I have to
reinforce the posts with a piece of 7/8" water pipe driven inside the thin
tubing.

I get up off the seat and crank the pedals while gassing it off every
stop. I normally sit down at about 22 mph which is why the posts bend
and keep pedaling until I hit about 25 mph which is a minimum cruising
speed.
With my set up in 6th gear i can increase the speed to about 27 to 28 mph
by pedaling.

Bike goes about 28 to 29 mph as long as there isn't a head wind. Will hit
30 mph with a tail wind.
I have never cruised at under 21 mph in over 3000 miles and the only
reason to go that slow is a head wind or an uphill grade.

Anyway if you don't like to pedal you might want a bigger motor. LOL

I have 2 Honda 50's and a Huasheng 50 4 stroke now.

I have the Robin 33cc on a Staton FD with a 1 1/8" roller on a 3 speed cruiser. I pedal in 1st to help the clutch engage but not much after that. It cruises at 17-18 MPH which is 5000-5500 RPM, right at the peak torque area of the motor. The motor sounds good there like it's running easy. Yeah it will go faster but the engine sounds like it's straining a bit. In 3rd gear I can pedal assist at that speed, but my legs are pumping fast and the it's funny to hear the motor rev up and down with the pedal strokes.

I am going to order up that heavy duty clutch they offer too, the one that engages at 2000 RPM. My engine will idle real slow and that clutch will allow me to putt around at 5-6 MPH w/o the clutch disengaging. You see, I am serious when I tell people that I want to go slower -

Mike B said:

I am going to order up that heavy duty clutch they offer too, the one that engages at 2000 RPM.

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OT: Mike but are you certain about the specific rpm speed on that clutch, I've use a tach and the Robins I've run idle around 2400.

Staton says the engine needs to idle below 2000. Nah, I haven't used a tach, but by the sound of it it idles less than half the current clutch start of engagement (ting-ting sound) speed.

I have the idle screw backed out so far that no threads are showing.

Late throwin' in my 2 cents worth, but if 23 mph was all Jon
could get with a 1.25' roller, I think he could likely have gotten
more from a 1". My gx35 poops out with too much stress, but
with a bit smaller roller it will rap higher. Even so, a gx35 isn't
a blown Hemi. They do pretty well for the small amount of power
they have, but if it speed ya want, look elsewhere.