Should I or shouldn't I? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 03-11-2014, 03:25 PM Thread Starter
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Should I or shouldn't I?

I have had my vn750 for 3 years now and I have done lots of very cool mods thanks to this awsume Fourm. The only thing I have not done is the Ear Shave / GoatsBelly removal and I have been considering it for a long time. I went ahead and bought all of the parts/ K&N filters, shims, jets, breather and I also bought flexible pipe to remove the goatsbelly. I am not sure if I want to do it because 1-I'm scared to mess up the carbs and 2- when I do very long rides with my club, I need to get at least 120 miles on a full tank of gas and I only get 112 now. Yesterday I installed a brand new OEM petcock because the old one only had only 1 screw and the reserve never worked. So I am hoping this would fix that issue but I wanted to know if I do it how much would I gain and how much would I loose. If I decide not to, I will sell the parts here in the forum. Thank you guys very much!!
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post #2 of 10 (permalink) Old 03-11-2014, 03:44 PM
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Well you can do the ear shave, no need to install the new jets, and leave the goat on. You'll lose a few miles maybe but you'll notice the performance. Also if you'll get rid of all that emissions junk.

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post #3 of 10 (permalink) Old 03-11-2014, 05:33 PM
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No need to rejet for an Earshave alone. If you also Open up the exhaust (different pipes etc) -rejet beneficial.
Goat Belly removal...still not necessary to rejet... but could/would gain performance.


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post #4 of 10 (permalink) Old 03-11-2014, 06:49 PM
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Quote:
Originally Posted by WilliamTech View Post
No need to rejet for an Earshave alone. If you also Open up the exhaust (different pipes etc) -rejet beneficial.
Goat Belly removal...still not necessary to rejet... but could/would gain performance.

Actually removing the GB only gives you a bit more umph at WFO. You lose power in the low end.

If you want my opinion, I'd leave the bike stock. Maybe marble and adjust the fuel screws, but if you want to get good mpg figures, don't do an earshave or alter the exhaust.

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post #5 of 10 (permalink) Old 03-11-2014, 08:19 PM
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Quote:
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Actually removing the GB only gives you a bit more umph at WFO. You lose power in the low end.

If you want my opinion, I'd leave the bike stock. Maybe marble and adjust the fuel screws, but if you want to get good mpg figures, don't do an earshave or alter the exhaust.
If you want to keep good MPG, I agree with this. Once you start modifying the exhaust and opening up the intake, you will probably need to rejet and you will lose MPG at the expense of more oomph.

But to me it sounds like you already have some kind of issue if you are only getting 112 miles to the tank. Maybe the new petcock will fix that for you. But either you are riding extremely crazily or something else is wrong. I have ear shaved, put on V&H pipes (which eliminate the GB...even though I did that with flex pipe before the new exhaust), and K&N air filters. I've rejetted to 142/42 and have my air/fuel screws out 2 1/2 turns. I still get 47 mpg which for me means I don't even hit the reserve until 135 miles or so. And I feel like I ride fairly aggressively, accelerating quickly and doing 70+ mph most the time.

Personally I love my bike as it is now. If it weren't for riding 2 up with the wife for longer distances, I wouldn't even be considering a bigger bike. I feel like it has the best of both worlds...plenty of power and great mpgs.

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post #6 of 10 (permalink) Old 03-11-2014, 08:27 PM
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x3. Any changes such as you described may give increased power but at the cost of mpg. 112 miles per tank seems a bit low so I would look into working towards building that upward. Maybe a good carb cleaning or at least the use of high strength SeaFoam to clean things out a bit. Make sure you have everything set to proper stock specs and go from there. Pull the plugs and see what they tell about the motor. Good luck.

and always remember, "Ride until you rot!"
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going forward. Five operations done and it still continues.

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post #7 of 10 (permalink) Old 03-11-2014, 11:02 PM
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I ear shaved mainly for the ease of working on the carbs. It's well worth it if you ever have to pull them again, which I do for cleaning regularly anyway.

I'd keep the "goat's belly", i.e. what Kawasaki called the "power chamber". It deepens the exhaust tone which I think these bikes really need. If you remove it (not sure why anyone would), be sure to put in a replacement crossover to maintain your exhaust scavenging and power.

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post #8 of 10 (permalink) Old 03-12-2014, 12:37 AM
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My bike when stock got 49 mpg over a 5 tank test, did earshave and larger jets (went to 42/142) with 2 shims under the needles. I'm now 46-48 mpg but with a bit more zip. Plug color is a hair dark but not bad; more of a darker caramel color instead of a light tan.

For mileage comparison I'm 185 lbs and run a medium sized windscreen with large bags. Most riding on country roads at 55-58 mph. I actually get about 1 more mpg on 65 mph roads (probably because of no stops and few turns) but mileage drops to 45-46 mpg when I run interstate speeds. Fuel mileage results over the last 17,000 miles have stayed pretty consistent except the few times I've discovered very small vacuum leaks, then the mileage drops a hair until I find and fix the vacuum leak.

A friend with a VN750 found air leaks on both carb boots (no clamps) He added clamps and suddenly he's getting about 10 mpg better mileage. A very small vacuum leak (like on the vacuum line to the petcock) will cost you 1-2 mpg.

It's funny,,,, with a vacuum leak you'd figure that mileage wouldn't drop because the air speed through the carbs would drop pulling less fuel from the jets. But I've found that instead mileage drops when you have a vacuum leak.

I'm one of those numbers guys who likes to figure their mileage pretty often, sometimes over several tanks to get a true average. My bike usually hits reserve at about 135 miles and needs about 2.8 gallons when I've just hit reserve.

hope this helps.

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post #9 of 10 (permalink) Old 03-12-2014, 01:34 AM
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...and the sheep continue to repeat that same crap that "1" individial who was considered a god put up....fookin sad........ And no, I wont even go into details....because its gotten too pathetic at this point.....

Point IS...."if you havent done it yourself, and have not modified yourself on your own vehicle".....then shut the FOOK up !!!!!

If you can share say...."yeah, did that to mine, or did this to mine, and this is what I got"......then share....dont keep following ONE individual from years ago and call it gospel....thats as bad as believing word for word, the modern bible.....

Dont give advice as though it was "the only way", unless youve done it yourselves. If ya havent, shut it !....tired of this sheep sheit....



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post #10 of 10 (permalink) Old 03-12-2014, 11:28 AM
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Any time a group of people compare miles per TANKFULL, the results are automatically scewed because everyone fills to a different level.

I can fill my tank to just below the filler neck and get 120 miles per tank, or fill it up to just under the cap and get 140+ miles per "TANK" before hitting reserve.

Do yourself a favor and calculate your actual MPG and see what you are getting with accurate measurements.

BTW: my bike is stock other than turning out the idle screws and removing the emissions crap (coastered).
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