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  #1  
Old 08-05-2014, 07:55 PM
craig60 craig60 is offline
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Default z750 trike

I built my z750 trike from scratch using my motor but put a gt750out put shaft and used a,'A' axle. the problem im having now is I cant get it to do more then 45-50 mph. Im also running 17" wheels. Any ideas folk?
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Old 08-05-2014, 08:05 PM
beef beef is offline
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What rear diff are you using?
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Old 08-05-2014, 08:41 PM
Willgofar Willgofar is offline
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you could be too high geared (wheels too big) Craig. what revs you doing at 40mph?
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Old 09-05-2014, 06:48 AM
craig60 craig60 is offline
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Smile Z750 trike

I'm using a reliant axle and it's an "A". As for revs I don't have rev counter on it
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Old 09-05-2014, 07:10 AM
craig60 craig60 is offline
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Default Re trike

I did rotate the rear wheel and It does one complete turn and the prop does 1 1/2 turns.
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Old 09-05-2014, 02:36 PM
wurzel wurzel is offline
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From a very old post on here (below) - Kwak final drive bevels (gt550/750 spectre) are all 3.7:1 don't know how that compares to your reliant diff but might point you in right direction. Also GT750 wheel has a rolling circumferance of about 80''


Blackjack
26-08-2008, 10:44 AM
final drive gearing for that one, not too bad in theory, first find out the original sproketts no of teeth front and rear plus the rear wheel diameter. many diff's or bevel drives tell you the reduction ratio on them or ask around. match the numbers up, eg front sprockett 11 teeth, rear 34 teeth is same as 11/34 rear diff ratio? so using same wheel size would keep same power delivery. Smaller diameter wheel/ tyre combo = more torqe better acceleration but lower top speed and higher revs for same crusing speed. I think that should work

Not really.

11/34 means a 3.09/1 diff.

But all that means is that the ratio is one revolution of the rear wheel for 3.09 turns of the output shaft. The gearing is how far the thing travels along the road for one turn of the output shaft.

Change the wheel size you change the gearing. smaller diameter wheels will mean you need a higher ratio to achieve the same gearing.

For instance, the difference in the rolling circumference of a standard GT750 Kawasaki wheel and a 205/40 17 car wheel and tyre is the Kawi wheel travels 80" and the car wheel 73 1/2" which is practically 10%.
Now if the trike is significantly heavier than the bike thats probably OK, and the aerodynamics of it would probably make it OK even if the trike wasn't much heavier.

So as it happens, that should work with a diff of around the same ratio as the Kawi final bevel which is 3.7/1.

In the case of using a chain drive engine turned sideways, you'd be looking at a 3.09/1 diff using your figures for the chain drive and mine for the wheels and tyres.

Which is nice to know, but now you need to find a diff...
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