LANCER
Serious Thumper Alliance Member
   
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Savage Beast Performance Parts
Posts: 10875
Oklahoma
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Anything can be modified, and I do not see why an '87 model carb should be any different. Those early model years did not come from the factory tuned quite as lean as the '95 and on model years, but there is still room for improvement...especially if the exhaust has been changed. A muffler swap changes the the fuel/air ratio, and that is compensated for by adjusting the carb/filter side of things in order to bring the fuel/air ratio back to where it should be.
Go back to the basics of carb tuning, follow the steps for tuning/adjusting each of the fuel circuits...choke/idle, low range (pilot circuit), midrange (jet needle/needle jet), and high range (main jet), and as you go through the process be sure to check the plug for the evidence of what is going on inside the engine.
While going through the process and checking the performance with various sized jets, you will find the best jetting for each range, and therefore the best performance . This is a time comsuming process, so be patient.
For a CV type carb there are some additional performance inhancements that can be made to the carb. One is to enlarge the air passage in the bottom of the carb slide, this will quicken the response time when the throttle is turned. It does not take much, so you need to be careful with this one. I do not remember the exact measurements on the stock carb, so that would need to be measured with a caliper or even a drill bit. For example: if the hole is 1.5mm, then you might go up to 1.6mm. Also, the dial-a-jet system is an excellent performance add-on (can be picked up for cheap on ebay)...but since they do not make the float bowl adapter for the stock Savage carb you will have to drill & tap into the side of the bowl to get the fuel source. It is easy to do and works just fine. The dial-a-jet works from 1/4 to full throttle, so the idle and pilot circuit still need to be done. Also, the slide spring can be changed to improve throttle response.
**Keep in mind though, that with all the things that can be done to improve a CV carb, it has limitations because of its basic design. There is no way it will perform like a carb designed/built for performance from the get-go.
SO..... What do you want? If on a budget and needing to use the stock carb, then get some jets, drill a little hole, make sure everything is VERY CLEAN, and go through the tunig steps...put on good air filter..and/or get cheap dial-a-jet on ebay. If you have more money available...buy a new performance carb.
Just a few ideas...take what you want out of it.
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