Need some info on my new bike.

[rickieh]

The 20,4,and 18 measurements are right but I don't know what exactly to measure for the 34 mm one. but yes they are all correct.

[rickieh]

Originally Posted by FastDoc

The huge 56T rear should very likely go as well, I think this generation hondoids are geared from the factory to carry 10 bags of rice and a family of 5, with a trailer.

I bet that's EXACTLY why they are geared the way they are! :idea:

That literally made me LOL!

[SpudRider]

Originally Posted by rickieh

The 20,4,and 18 measurements are right but I don't know what exactly to measure for the 34 mm one. but yes they are all correct.

The centers of the bolt holes should be 34mm distant from each other. The sprocket in the diagram fits a Honda XL185 motorcycle.

Spud

[rickieh]

34 it is! So I need to buy a front sprocket from that bike then?

[rickieh]

http://www.ebay.com/itm/JT-Sprocket-...9d6b85&vxp=mtr

[SpudRider]

Originally Posted by rickieh

34 it is! So I need to buy a front sprocket from that bike then?

Yes, the JTF259 sprocket you listed on eBay will fit your motorcycle. Any other sprocket designed for the Honda XL185 will also fit your motorcycle.

Spud

[rickieh]

would this formula be accurate for determining speed gain?

max speed=40 current teeth=15 new teeth=16
40/15= 2.67
2.67x16=42.67

new top speed of 42.67 mph

[SpudRider]

No, that calculation won't work. If you want to accurately determine speed changes for different sprocket ratios, you need to fill in the all the information required at the following website.

http://www.gearingcommander.com/

However, it's simpler to merely experiment with different sprocket ratios, and determine which is best for your terrain and riding style.

Spud

[wilserchinarider]

Originally Posted by rickieh

would this formula be accurate for determining speed gain?

With these little engines you will run out of power long before gearing, 17/46 is most prefered. If you are in a flat area, others have gone a little higher, but 1st gear will be pretty tall, and 5th will lose power on hills. The 15/56T will rattle your dental fillings at anything much beyond 40 MPH. 17/46 should get you 60 MPH or close to it, but the bike is working pretty hard at that pace.

[rickieh]

what can I do to push a little more pep from the engine without extensive mods like boring? I notice a lot of people buy aftermarket exhausts, can I get one of these? Bigger Carb? or even NGK plug and wire?

Also do I just measure the size dimensions listed before to find a back sprocket too?

[SpudRider]

Originally Posted by rickieh

...Also do I just measure the size dimensions listed before to find a back sprocket too?

Yes, compare your current rear sprocket to the diagram below.



Spud

[Weldangrind]

Originally Posted by rickieh

what can I do to push a little more pep from the engine without extensive mods like boring? I notice a lot of people buy aftermarket exhausts, can I get one of these? Bigger Carb? or even NGK plug and wire?

Also do I just measure the size dimensions listed before to find a back sprocket too?

I use 30mm Mikuni carbs on atv's and bikes with good results; they don't necessarily create more power by design, but they are much easier to find jets for. The key to developing more power with a free-breathing intake and exhaust is to jet the carb properly.

Some of the stock mufflers have catalytic converters built in, and that can be a major restriction. Sometimes the cat is built into the pipe, which means either chopping and welding or replacing the pipe. In any case, the stock mufflers usually suck.

A decent air filter is a good idea to help the engine breathe and to better trap dirt. I've used this one on several bikes and atv's, but I can't guarantee that it'll fit your bike: http://www.ebay.ca/itm/42mm-Air-Filt...item4ab686abc4 The price is right.