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Old 05-19-2015, 02:14 AM   #1
tucknoloji
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Suzuki Gs150 Performance upgrade

Hey guys... I am new to this forum but i am interested in having discussion of mods and modifications for the Bike performance...

The bike which i had is Suzuki gs150 smaller version of tu250 and some how similar to En150.

Its 12hp bike.. Having single cylinder.... Fuel efficient....front n rear drum breaks... Mikuni bs26 carburetor.... Stock foamic Air intake... And stock exaust which gives u silient ride...

Recently done 1395kms tour on bike to mountainy areas of Pakistan.. And found this bike very comfortable... Its more like Mini trail to me ...

Now i am looking to increase its top speed. Which is right now only 110km/h ....

So i am looking for suggestions from technical pro here ...

Last edited by tucknoloji; 05-19-2015 at 02:19 AM. Reason: upgrade required
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Old 05-19-2015, 08:43 AM   #2
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If its chain driven your best bet for more KPH's is a regear. Try going down two teeth in the rear. You will lose power on the bottom end though. You not working with much there maybe an upgrade to a 250 is in order.
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Old 05-19-2015, 09:45 AM   #3
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Quote:
Originally Posted by Japawhat02 View Post
If its chain driven your best bet for more KPH's is a regear. Try going down two teeth in the rear. You will lose power on the bottom end though. You not working with much there maybe an upgrade to a 250 is in order.
And then again some low hp bikes are geared high enough stock but the engine cant pull to current gearing top speed. Drop front sprocket a tooth to increase rpm and net a higher top speed.

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Old 05-19-2015, 10:22 AM   #4
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And then again some low hp bikes are geared high enough stock but the engine cant pull to current gearing top speed. Drop front sprocket a tooth to increase rpm and net a higher top speed.

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did not think of that try that too lol
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Old 05-19-2015, 11:17 AM   #5
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And then again some low hp bikes are geared high enough stock but the engine cant pull to current gearing top speed. Drop front sprocket a tooth to increase rpm and net a higher top speed.

_
Dropping one teeth from front ... Doesnt it mean increasing two teeth on rear sprocket....

Any how... I have dropped five teeths from 43T to 38T wich eventually mean increasing two teeth from front... ... Theocratically it shud do 15% more top speed... But when i push it in fourth gear... It easily go till 110 and wen i put it in fifth gear... Speed stuck there doesnt go beyond ...
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Old 05-19-2015, 12:16 PM   #6
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yes its roughly 2 rear equals one front. The problem you are having is you dont have the HP to spin that small sprocket any faster. Have you tried maybe just dropping 2 teeth. I dont think you are going to be able to accomplish what you want without engine modifications.
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Old 05-19-2015, 12:17 PM   #7
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Just curious with stock gearing are you hitting 110 at the limiter, or does the bike just stop pulling.
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Old 05-19-2015, 01:11 PM   #8
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regearing will not affect top speed. It will only affect the engine's RPM's to achieve top speed.

The only way you're going to get more speed is to add more power.
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Old 05-19-2015, 01:57 PM   #9
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Quote:
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regearing will not affect top speed. It will only affect the engine's RPM's to achieve top speed.

The only way you're going to get more speed is to add more power.
How to add more power ???

I have rejeting the carb... Used bigger main jet and lift the Pilot jet as well... Response is better it goes till 110 on brisk pace.... No other bike does that ...
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Old 05-19-2015, 01:59 PM   #10
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Quote:
Originally Posted by Japawhat02 View Post
Just curious with stock gearing are you hitting 110 at the limiter, or does the bike just stop pulling.
Wat do u mean by Limiter ???? Well on stock i use to reach 110 in five gears... Now in four gear i reach around 110 ... Its juat fifth gear where rpm drops and top speed felt too far away ... Or may b it will take more time to get to some top speed...
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Old 05-19-2015, 02:01 PM   #11
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Quote:
Originally Posted by Japawhat02 View Post
yes its roughly 2 rear equals one front. The problem you are having is you dont have the HP to spin that small sprocket any faster. Have you tried maybe just dropping 2 teeth. I dont think you are going to be able to accomplish what you want without engine modifications.
Will try that.... Will try to find a sprocket to drop two teeth theatrically
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Old 05-19-2015, 09:53 PM   #12
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the only way you're going to get any real extra power is to bore the cylinder to a larger size to get more cc's of displacement.

Personally I think you're better off buying a larger bike.
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Old 05-19-2015, 10:21 PM   #13
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Quote:
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the only way you're going to get any real extra power is to bore the cylinder to a larger size to get more cc's of displacement.

Personally I think you're better off buying a larger bike.
Can buy large bike... But traveling within #Pakistan this the best bike ... As the size... Weight.... And parts are easily available plus... I know this machine very well.... And for touring u need to know the machine on which u r traveling... So buying new one can b done side by side ...

Any other suggestions i wud appreciate
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Old 05-19-2015, 11:45 PM   #14
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You will get the most bang for your buck by freeing up the intake and exhaust of restriction, and finally installing a higher lift / longer duration camshaft. As an example, a CRF150F available in the states....12 hp stock, 14 with exhaust, high flow filter, cam. 16 HP bored out to 188cc, 18 hp bored with pipe, cam, intake. So, cc's are the way to horsepower on the lower tuned 4 storke air cooled singles.

Unfortunately, all the kits to big bore your GS are to make a 125 into a 150.

Cams are available, do a google search... http://palawan67.rssing.com/chan-5942527/all_p435.html

Intake is available anywhere...get a pod filter. Exhaust, anything less restrictive than stock will help. Built for application will make more power as it will sonically tuned if from a good manufacturer. But cam is the key to building power.
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Old 05-19-2015, 11:46 PM   #15
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Is this your bike? http://www.paksuzuki.com.pk/Automobi...main-site.html
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Old 05-20-2015, 07:28 AM   #16
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This is my bike .....

http://www.pakwheels.com/forums/showthread.php?t=234685

Between how can i add pics in the forum ???
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Old 05-20-2015, 07:32 AM   #17
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Yesss
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Old 05-20-2015, 07:55 AM   #18
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Quote:
Originally Posted by tucknoloji View Post
Wat do u mean by Limiter ???? Well on stock i use to reach 110 in five gears... Now in four gear i reach around 110 ... Its juat fifth gear where rpm drops and top speed felt too far away ... Or may b it will take more time to get to some top speed...
Guys his request is higher top speed not necessarily more power. His post above tells you my hunch was correct. He can pull 110 kph in 4th but no higher in 5th gear. Drop gearing one tooth in front or increase 2-3 teeth in rear and 5th gear will now be able to rev out and exceed 110 kph. My guess he will gain 10-15 kph. This is also the cheapest thing to try and keeps engine and airbox stock. Best solution by far.

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Old 05-20-2015, 11:54 AM   #19
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Quote:
Originally Posted by SilverBullet View Post
Guys his request is higher top speed not necessarily more power. His post above tells you my hunch was correct. He can pull 110 kph in 4th but no higher in 5th gear. Drop gearing one tooth in front or increase 2-3 teeth in rear and 5th gear will now be able to rev out and exceed 110 kph. My guess he will gain 10-15 kph. This is also the cheapest thing to try and keeps engine and airbox stock. Best solution by far.

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Old 05-20-2015, 04:26 PM   #20
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you're wrong but you keep believing.
I never hesitate to admit I'm wrong when I am. But in ths case I am not. Read what he says above. His top speed is the same in both 4th and 5th gear. Do you think Suzuki put identical gears for both? Of course not but he can wind out 4th gear to net same top speed because when he puts it into 5th the little engine cant pull the higher gearing. So by slightly dropping the gearing the engine can rev out and overcome the higher gear and increased wind resitance. Theoretical top speed is not the same as actual top speed for under powered bikes. Go read any thread on the Honda CRF250L. Well known and documented that dropping down a tooth on front sprocket from 14 to 13 nets more top speed, every time.

Just trying to help the guy out with a solution so don't discourage him by claiming something you dont know about and that is not true.

tucknoloji just trust me and drop your front sprocket by one tooth and report back here please. Your top speed will increase, guaranteed just cannot say exactly how much. Will cost you all of $15 to try and easily reversable.

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