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  #1 (permalink)  
Old 11-18-2017, 04:11 PM
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1/2" offset help

I have finished building my bike about 2 years ago everything is perfect the frame has a 1/2" offset built in.
I have tried everything possible to align the bike so it tracks strait but it still wants to fall to the left and won't track strait.

Has anyone got a solution to this fix?

I'm not saying I want to ride without holding the bars but sometimes you have to.

The bike is perfectly aligned but when you let the bars go the bike goes to the left and you have to counter balance it by shifting your weight to the right.
So it seems having a built in motor offset 1/2" to the left causes this problem
advice with a solution is greatly appreciated and or how you might have fixed it
Bike builders who build for a living I would like your opinions and what you do to fix it

Last edited by 1957chopper; 11-18-2017 at 04:18 PM..
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Old 11-18-2017, 05:14 PM
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Quote:
Originally Posted by 1957chopper View Post
I have finished building my bike about 2 years ago everything is perfect the frame has a 1/2" offset built in.
I have tried everything possible to align the bike so it tracks strait but it still wants to fall to the left and won't track strait.

Has anyone got a solution to this fix?

I'm not saying I want to ride without holding the bars but sometimes you have to.

The bike is perfectly aligned but when you let the bars go the bike goes to the left and you have to counter balance it by shifting your weight to the right.
So it seems having a built in motor offset 1/2" to the left causes this problem
advice with a solution is greatly appreciated and or how you might have fixed it
Bike builders who build for a living I would like your opinions and what you do to fix it
How wide is your tear tire?
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SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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Old 11-18-2017, 05:48 PM
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200 rear 1340 evolution 3" bdl open belt drive
8" over front end 6 speed gear box
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Old 11-18-2017, 06:12 PM
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Quote:
Originally Posted by 1957chopper View Post
200 rear 1340 evolution 3" bdl open belt drive
8" over front end 6 speed gear box
Is it heavy on the left or pulls to the left?
That,s unusual to have heavy left side with 200 tire.

200 tire tire is quite well established setup and does not require much offset in either engine or transmission. Typical setup is .5 offset in engine and additionally .5-3/4” in trany vs zero in engine +1 1/4” in trany/ primary. I had both ways and both were running true center. Offset in engine .5 “ is not much from the weight prospective.


If it pulls left, make sure the both wheel are centered and the rear tracks the front perfect. Also the rear should be square in the swing arm - if it crooked - might pull to one side.
Other considerations- wheel bearings, uneven tires which might be less likely in your case.

Is your belt drive with outside bearing support? Those fuckers are heavy.
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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  #5 (permalink)  
Old 11-18-2017, 08:11 PM
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Open belt drive is stock 3"" bdl
A few weeks ago I put in on the hoist and re did the alignment

The rear wheel is perfectly aligned with the swing arm and backbone
Bike levelled on hoist
Loosened all front end pinch bolts axle bolts calipers etc
Did the alignment handle bars dead on straight
Tightened pinch bolts on triple trees first kept checking nothing moved and tightened
My way down to the axle bolts.
Checked when all tight and perfectly aligned
I've got new tyres front and back prob 600 kilometres on them
I balanced the wheels wearing perfectly
Take it for a ride and still pulls to the left.

What I did next
I took it to a mates mate who is a master of aligning Harley's etc
He did his magic
Came back to me scratching his head asking why I took th bike to him
Saying the bike was so well aligned it should track strait forever

Mind you he only does alignments and not a mechanic

So he couldn't say why the bike pulls to the left

The only thing causing this problem is Ide say the 1/2" offset
I'm stumped as how to fix this
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Old 11-18-2017, 08:22 PM
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my original frame was a Rigid Harley frame with no offset
It tracked a straight line fore ages

Just so you understand full what I have done
I took everything off the rigid and bought the exact same frame
but a softail cause of back problems and rebuilt it
The softail has the 1/2" offset and is pulling/ falling to the left
The bike looks exactly the same as when it was a rigid just its now a shaftail

Last edited by 1957chopper; 11-18-2017 at 08:26 PM..
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Old 11-18-2017, 08:44 PM
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Quote:
Originally Posted by 1957chopper View Post
my original frame was a Rigid Harley frame with no offset
It tracked a straight line fore ages

Just so you understand full what I have done
I took everything off the rigid and bought the exact same frame
but a softail cause of back problems and rebuilt it
The softail has the 1/2" offset and is pulling/ falling to the left
The bike looks exactly the same as when it was a rigid just its now a shaftail
Hold it. did you keep the original offset parts when the motor was center??? That means that you might have trany / primary too far to the left- unnecessarily.
How much clearance between the rear chain/ vs belt and rear tire? You must have picked up 0.5” there ( spaced)if you kept the same wheel centered, while the whole power train moved to the left.
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber

Last edited by STEINBVG; 11-18-2017 at 08:51 PM..
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Old 11-18-2017, 09:32 PM
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I'll try to explained what I mean as best I can
I have a Kraft/tech frame

Part # K19012 Style Softail Softail
tire Width 200
tubing 1-3/8"
Rake 35
up stretch 4"
Backbone stretch 1"

With this frame the only things I had to buy so I could fit the 3" open bdl belt drive
To the motor and gear box were :
1/2" motor to bdl plate spacer
1/2" front pulley bolt to suit 1/2" offset
1/2 clutch hub L hand thread bolt to suit 1/2" offset
And I used my lathe to make my own 3/4" rear wheel pulley spacer

Gear box and motor holes are cnc done on frame no brackets used all solid mounts

It's all done to spec nothing is bodged up
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Old 11-18-2017, 09:46 PM
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These frames are set up for 200 tires with a 1-1/2” belt (or chain)
* Offset is built-into frame. . . use 1/2” spacer between engine & inner primary
cover and 1/2” longer spacing on engine sprocket or pulley
* Frames feature an integral 1-piece trans plate for strength & superior driveline alignment

What a laugh the weight is 1/2" to the left
causing the pulling to the left problem I have

How am I sposed to fix it
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Old 11-18-2017, 10:06 PM
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Quote:
Originally Posted by 1957chopper View Post
I'll try to explained what I mean as best I can
I have a Kraft/tech frame

Part # K19012 Style Softail Softail
tire Width 200
tubing 1-3/8"
Rake 35
up stretch 4"
Backbone stretch 1"

With this frame the only things I had to buy so I could fit the 3" open bdl belt drive
To the motor and gear box were :
1/2" motor to bdl plate spacer
1/2" front pulley bolt to suit 1/2" offset
1/2 clutch hub L hand thread bolt to suit 1/2" offset
And I used my lathe to make my own 3/4" rear wheel pulley spacer

Gear box and motor holes are cnc done on frame no brackets used all solid mounts

It's all done to spec nothing is bodged up
Sounds right. This setup shouldn’t be too left side heavy. In theory and practice.

People run left side drive with 250 tires and much more offset and they seem to run straight...at least some of them. Some are left side heavy. But 200 tire...should not be a problem.



I,m at loss here. Kraftech is a reputable frame. Should have worked fine

With some modifications, you might be able to run rear chain and get rid of 0.5” primary offset perhaps.? Move trany to the right ? Could be better weight distribution. Just a thought
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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  #11 (permalink)  
Old 11-19-2017, 01:24 AM
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thanks for your thoughts and valued input

But going from belt to chain will only allow me to fit a 210 tyre.
I've looked into it.

Although I'm now looking at the space either side of my 200 rear tyre It seems I Have enough room to fit a 220 tyre without any probs.

The 1/2" offset pull to the left still applies due to the motor being 1/2" off centre to the left, kinda like a sea saw fat kid on one end and skinny on the other end

I have noticed some newer Harley's when riding behind them their rear wheel is off centre to the swing arm as much as 1" Im thinking they may have an offset of 1" to counter balance the pulling to the left.
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Old 11-19-2017, 06:04 AM
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Quote:
Originally Posted by 1957chopper View Post
thanks for your thoughts and valued input

But going from belt to chain will only allow me to fit a 210 tyre.
I've looked into it.


Although I'm now looking at the space either side of my 200 rear tyre It seems I Have enough room to fit a 220 tyre without any probs.

The 1/2" offset pull to the left still applies due to the motor being 1/2" off centre to the left, kinda like a sea saw fat kid on one end and skinny on the other end

I have noticed some newer Harley's when riding behind them their rear wheel is off centre to the swing arm as much as 1" Im thinking they may have an offset of 1" to counter balance the pulling to the left.
But going from belt to chain will only allow me to fit a 210 tyre.
I've looked into it. *********

That,s exactly what I was asking you before, it means chain would be so far from the wheel that you can fit fatter tire if you keep the same transmission offset.

!!! But instead you could move trany and primary to the right keeping the same tire. You will have to use the biggest offset trany sprocket and ride chain 1/8”-3/16” to the tire. Your weight will shift to the right and might balance the bike even if motor remains in .5” offset.

Hell, with chain also what you can do is to move motor home welding shut the offset frame holes and drilling the new in the stock position. The trany would remain in existing mounts, primary would be attached without 0.5” spacing and instead of belt using chain and the biggest offset sprocket( 0.9”) you will have enough clearance for the tire( obviously the rear sprocket would have to have the new wheel spacer to align) and you keep 200tire

My chopper has 0.5 offset motor, 0.5”offset primary , chain and 200 tire on 5.5” rim( chain . Perfect balance.
My bobber, 0.5” motor offset, 0.5” trany offset , 180 tire 5.5” rim and chain- perfect balance
I had my Walz pro street with .5” motor offset, stupid LSD, 230tire on 10” rim!!!( bigger than 250) pulled to the left like crazy. Changed to RSD, trany and primary moved to the right 2”!!!!

Old offset and new Rsd transmission position. Look how far it was sticking out.
Now i have 300 tire and perfect balance
__________________
VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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Old 11-28-2017, 07:38 AM
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did you contact the frame maker. maybe he has seen this problem before or can shed some light on your problem
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Old 11-29-2017, 10:48 AM
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Its pretty much the nature of the beast with a 1/2" offset frame. CFL's have the whole drivetrain offset 1/2" and in mt opinion are left side heavy. Theres no real good way to compensate for it other than moving the rear wheel to compensate for the weight. HD does this on a Softail. They offset the rear tire .200" to the left to help compensate for the weight of the primary. I learned this years ago trying to center a rear wheel in the fender on a PM phatail kit. PM leaves the offset in there so it handles closer to the stock bike did. I ended up making all new spacers since we were using a custom rear fender that would have looked ridiculous with the tire offset in it.

This is a case where form sometimes follows function....or basically settling for the lessor of two evils....
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Old 12-02-2017, 05:04 AM
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I run a 300 rear and 21 speedmaster up front. Both are mic'd in perfectly and the bike is left side heavy without any offset, even going straight. Having the primary sticking out on the left with all of the other heavy Harley bits, makes it that way.
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