[cpc]

Im looking for an 18 tooth front and a 30 tooth rear sprocket for 530 chain....anyone? Thanks!

 

[66Sprint]

For what bike?....... An 18 front may be a little large and the chain might hit the clutch pushrod on a 350, 360 or 450

 

[66Sprint]

Try www.sprocketspecialists.com/

 

[cpc]

they say an 18 will work for out engines

 

[66Sprint]

Who are "They" who said that?....LOL

 

[cpc]

sprocketspeciltists.com take a look for front 15 to 18 tooth and rear 30 to 71 tooth

 

[66Sprint]

Just wondered.... that's good enough for me......

 

[cpc]

Since I ride soly on the street im looking for an 18 front and a 30 rear

 

[Bird76Mojo]

That'd sure make that bike a real dog to ride, not to mention clutch life. I don't think the 18 front will work either, regardless of what sprocket specialists says. They, like most other companies, will sell you anything telling you it'll work, but in the end don't really care if it does or not.

I'd spend that money on something else for the bike, or hunt down a bike affordable to you that's more suited to your riding style and terrain. My 2 cents...

GB :mrgreen:

 

[66Sprint]

The sprockets (ratio) you want to run could yield a higher top end (theoretically 117MPH) but this is assuming you don't mind pushing/running along side the bike to get it rolling (you'll LOSE about 40% of your torque) ....the 1.66 ratio you want is signifigantly different from the factory 2.25 (CB) or 2.37 (CL) ratios....
I tried a similar set-up (ratio) on a SOHC 750, and could literally brisk-walk almost as fast as the bike would go in first.... If you MUST go faster (or at less revs) try a ratio nearer to the 1.87 to 2.0 range (15 or 16 front, 30 to 32 rear) so the bike has SOME "pull" left in it... JMHO
Steve

 

[cpc]

so what your saying is to stay with my 16 tooth front and use a 30 tooth rear? How much would this reduce my rpms? Im looking for 75-80 mph on the freeway without buzzing myself to death (Ill be taking a 1500 mile trip to my parents (3000 miles round trip).) Thanks!

 

[Bird76Mojo]

That bike just isn't suited to interstate travel. At least not long distances. Just look for the smallest tooth count you can find for that rear sprocket and see what that does for those rpms.

Ideally, you'd be better off trying to find another cheap bike for interstate travel. More of a touring variety, or a cruiser. I mean damn, you are working with a bike that was built for mainly offroad fun, and possibly a little on road travel..

GB :mrgreen:

 

[66Sprint]

Simple math will tell you.... The 16/30 ratio is 1.875.... Stock on a CB is 2.25...
You can figure exactly what you now have (rear teeth) divided by (countershaft teeth).....
Let's say you are in fifth gear now going 5000 RPM at 50 MPH (example)with the stock 2.25 gearing...
With the 16/30 gearing,(1.85), you would only be turning 4111 RPM to go 50 MPH in fifth gear.... Almost a 20% drop in revs....

New RPM= New ratio times Old RPM divided by Old Ratio

I do agree with GB though... a 350 is a tad too small in power and weight for interstate travel over a long distance...And you are contemplating REDUCING the power in favor of top speed......Not that it can't be done, just that it's a lot of hours and work to do it....I could easily do 300 to 350 Miles per day @ 60/65MPH on a properly geared CB 450, but after that you are vibrated to exhaustion.... But, then again, you WILL be stopping every hour and a half to re-fuel and take a break.....

 

[cpc]

this http://www.sprocketspecialists.com/Spro ... izer2.aspx is what Ive been using.....with specs in the shop manual. I however am not contemplating "top speed", I don't want to go 130 mph on one of these! I just want to get rid of the buzz effect, which seems to set in at around 5000 rpm, I sincerely wish we had the ability to utilize some form of rubber damping spacers or washers in the 5 engine mounts, and until i can figure out a safe and effective way to do so, i need to simply reduce the rpms. I may want to go long distances, but where I live... I-70 is the ONLY way out of the valley unless I want to add another 300 miles to the trip....I want to take US 40 to my parents house, since it runs through Denver here (Colfax Ave) to basically my parents back yard (about 2 miles from my parents house).... If I had the $$ I would buy another bike for this trip, but I don't have that to do, Ive built this bike on less than $250 including a title service and registering it in Colorado which is obsessed with taxing ppl to death! Just trying to do this right on the cheap. And ya, I know it would take forever and a day to make the trip, just want the ability to do so!

 

[66Sprint]

It can be done, just that interstates are not recommended ... An underpowered, lighter bike is dangerous on interstates.....You don't have enough power to accelerate, pass, and climb hills.......and thus, barely enough MAINTAINABLE speed so YOU don't get run over......

 

[cpc]

This is what Ive come up with....I didn't measure the front/rear axle distance though, but that should not make a huge impact on these calculations......

 

[66Sprint]

The 118 MPH top end on your table is very close to the 117MPH I got crunching the numbers myself.... HOWEVER, that does NOT take into account the HORSEPOWER/TORQUE of the stock bike.... It's strictly based on tire size and gear ratios..... A stock 350 engine simply doesn't produce the raw torque necessary to MAINTAIN those 75 to 80 MPH speeds on anything but flat roads..... You can GO that fast, but you can't maintain that fast.

 

[cpc]

I more than realize that, but I have no intent to ride on the interstate longer than I would need too, anyways from here it's UP and OVER the continental divide, so NO one is flying up the mountains......I simply want to get rid of the bumble bee buzz effect above 5000 rpm, while being able to cruise at 50 - 55 mph that is why I have decided to stick with my 16 tooth front sprocket and buy a 30 tooth (I currently have a 36 tooth rear)....Im not trying to fly on this bike, I just want to tweak it to be somewhat comfortable, which I have nearly done already, simply with getting rid of the stock seat. I seem to be riding this bike about 200 miles/wk so i just need to make it suite me....not rob it of power for top end ill NEVER use. Figure at most Id get it upto 80 to pass someone, there should be more than enough power left for that with this engine. unless its tried, we cannot prove or disprove this engines capabilities! Im not saying your wrong, im just saying from the math, it says this can be done with room to spare.

As for the Maximum Power RPM on that chart, I used the max torque listed in the shopmaunal, not max HP, I do not know which matters more for these calculations.

 

[66Sprint]

Buy BOTH sprockets AND a chain....They wear as a unit....... 16/30 should reduce the buzz, but it also reduces the max available torque by the same 40%....Put that in your calculator..............
The 350 is probably the BEST around-town commuter bike EVER made, however, it is inadaquate for interstate travel except for short (brief) periods/distances....

 

[Bird76Mojo]

If you've been running a 36 rear and you switch to even a 31 or 32 I think you'll be pleasantly surprised as to the change. I changed the rear on my DRZ from a 41 to a 46 and lost over 25mph up top but gained massive amounts of power wheelies!! :shock: You're of course doing the opposite..

GB :mrgreen: