520 Conversion on 86VFR750 INSTALLED!!!!

Well after working with moto-heaven and doing a little back and forth with the proper front gear I now have a working 520 kit for my 86 VFR750F. I am very excited it uses a steel front sprocket 13 spline with -1 tooth (15). The rear I went with a 45 tooth made of 7075 aerospace grade aluminum that is heat treated to a T6 hardness. The rear was a tight fit very close tolerance just like I like it. The chain is a 520X110 EK MVXZ gold chain and I upgraded to a rivet master link.

Well now that the description is over. I will say acceleration is MUCH MUCH improved I will have to get use to the new ratio but it should not be a big deal. I am still below 5k doing 60 in 6th so I should be good on the highway. Roll on throttle is also much better. I would defiantly recommend this kit to anyone who wants a little more juice out of their VFR. Also other gear ratios are available. I will get pics soon when it is not dark. So respond back with questions and comments and have a good night.

PICS

 

What was the total price tag for the conversion?

 

176 with rivet style master link

 

Good luck with the longevity aspect.

 

Has the chain noise level lowered? Got any pics?

 

I thought 15/45 was the stock ratio?

 

It might be for the 700 Honda had a habit of gearing the 700's a little differently but for the 86 vfr750 it was 16 and 45

 

Stock gearing for the VF700F is 16/44.

 

Is the rear spocket a custom made?

I can find a front spocket to make a 520 convension (same as cbr900 929 use for canvention), but not a rear.
A 525 convention seems to be easy, you find sutable spockets from other models both front and rear.

I also noticed a intresting thing. US `86 VFR750 and `86-87 VFR700 have a other front spocket listed then the `86-87 VFR750 to the rest of the world!
The US version has a spocket thats 14.5mm wide and has 2 holes whit treads, the rest has a 16,8mm wide one whit no holes....


The 520 convention spocket should be intresting for thous that do wheel swamps and have problems whit the chain line as the spocket has a 1,4mm offset

 

Sorry I have not been around too much sense the crash. But yes the rear was custom made. Also the front was offset from center.

 

were there any special tools needed for conversion and did swingarm have to be removed to complete conversion?

 

The only special tool was a chain breaker and riveter but you can get away with not using one if you get a clip style. You do not have to remove the swing arm just the clutch slave and rear wheel.

 

Another reason to switch to CBR F2 wheels!

 

Hi Midas; One of the best feelings that I get is when a difficult project comes together and the result is a success. Enough with the flattery, So what are you attributing for the performance improvement,the change of the gear ratio or the switch to the 520 chain,or possibly both. I recently did a chain and both front and rear sprocket change. I kept the front the same and increased the rear +3 with a new DID ER chain.I used an aluminum Vortex rear sprocket, however I wish I had done more research on the sprocket,such as finding out what type of aluminum its made from and the hardness of the sprocket. People have told me the Vortex stuff wears out very quickly,I am not sure why, possibly quality or hardness. Anyone out there running Vortex with good luck? Please I would like to hear your comments. I think if I did this again I would be much more careful!! eddie

 

Hi,

Ok, my question is still on topic, I believe :^). I have an '84 VF700F & I'm changing chain/gearing for the next season. I looked at this 530 - 520 conversion, but was put off by the custom rear sprocket. I did some more looking around & found 2 520 sprockets, by Sunstar, for my 700. One is 50T and the other is 48T?!

So here's my question to the group. My stock gearing is 16/44 giving me 2.75 final. I'm running a 16/46 combo in 530 now, giving 2.88. Not much change but my mileage still dropped bit. An 18/48 combo would give me 2.67, a compromise in the final ratio and a lighter setup, 520. My understanding is that the smaller the front sprocket, HP is lost to work moving the chain around that tight circle. So, finally, would an 18/48 combo make sense, and can I still get by with 110 links? Any info appreciated.

TIA,
Anders

 

Run a 17/48 for 2.82:1, unless you're looking for that fuel economy back for some reason. 18/50 is 2.777, very close to your stock ratio.

 

Sorry I have not been around with school, work, and recovering from my accident I have not visited the board in a while.

Anyway I Attribute the performance difference to both the 520 and the gear change there was a huge difference in weight between the 530 and 520.

 

Thanks! Read the thread with great interest, ??

Thanks Midias for the link to your chain conversion thread, it worked perfect. I read through it and some of the original questions I had still remain. You started the thread over a year ago on Sept 11, 2007. So by now you have probably formed an opinion on the custom made aluminum sprocket you bought. So question #1 is, "How do you rate the aluminum rear sprocket? And, who made your hardened custom sprocket and what did it cost?"

You had two members post questions about chain longevity,
Veefer800canuck and KENY. I think it was KENY who copied the JT blueprints of the front and back sprockets. I think he questioned the spacing of the front sprocket and alignment problems regarding the chain. So is the chain or the aluminum sprocket wear or both a problem?

Next, one of the questions about your set up was the decrease in gas mileage. You changed to a 3:1 final. You said you loved the increase in acceleration but feared the change in gas mileage. So question #2 is, "What was the change in gas mileage? What kind of mileage are you getting with the 3 to 1 ratio."

3rd question. "How is the EK chain working out?" I recollect that EK chain was less expensive than DID or RK chain. Any comments about your choice of chain?

I'd like to know how your conversion is making out after over a year, and I figure that I'm not the only one. So thanks for the info about your experience.
DKC

 

OK pics added. Just to restate the guys at Home - Moto Heaven did almost all the research and fixed things up for me with little effort on ym part.

Unfortunately I had this happen about one month after the install.

http://vfrworld.com/forums/anything-goes/18922-guess-whos-back.html#post132732

and I have only ridden my bike about 20 times sense the 520 install and that is for the entire last year.
The guys at Home - Moto Heaven
hooked me up I just called them and talked they were very nice. So I guess the sprocket works fine I am hoping to finally use it a lot next riding season. I don't think wear will be too bad 7075 aluminum with a T6 temper is really beastly stuff.

I don't know about wear but I do know the front sprocket is offset and the teeth are not centered.

I am still getting about the same mileage 40 to 45.

Seems fine no stretching so far. The chain is what moto heaven sold with all of their 520 kits at the time.

Like I said before the conversion seems fine but I don't have a lot of miles on it yet.

 

Sorry about you having an accident. Glad that you

survived it and are on the mend. I have to tell you that I use an old telephone wire internet connection so my internet is kind of limited. I have to wait for photos to download for hours. So although I got a post that remarked about an accident I never knew about the fact that it was on your VFR or any of the particulars of the accident. I have seen one photo of the crashed bike and a photo of your helmet with the severe rash across the front of it. I have to assume that you got severely knocked around.

I am glad you got the bike back together. Hope that you got insurance money (that it was ruled the other guys fault) and that you got a nice payoff on the bike. But even if you didn't it was a primo bike and I'm glad to hear that you got it back together. I hope you will put some miles on it and give me and all the rest of us your decision re the aluminum sprocket. In the mean time I'll keep you posted on what I decide regarding my choice of 525 with steel rear sprocket and 520 with aluminum sprocket.

DKC