jet questions
Thread Starter
Junior Member
Squid
Joined: Mar 2018
Posts: 3
jet questions
Hey all,
ive got a '98 that i just installed Danmoto gp slip on's on, like 2 days ago. Now, i have a Dynojet kit in the mail to arrive this monday. My local shop wants an obscene amount of money to install it, but since i'm an aircraft mechanic by trade, i figured the headache would be worth the pennies saved by doing it myself.
Now i have never worked with carbureted machines in the past, but i understand the general principle and have watched a couple videos of people tearing these things apart. And its my understanding (correct me if i'm wrong), unlike a lot of the 4cyl bikes, a jet is basically required with these bikes after exhaust work since they run so lean.
My questions are:
-Should i worry about getting a dyno run in before and after
-is installing the kit, as is, as-per Dynokit's instructions sufficient? or will i have to play with the pilot jet some more
-what general settings would you recommend for an aftermarket exhaust similar to the one linked above?
-are there any little nuances or tips for removing the carbs on these bikes (except the obvious)
-what is the general opinion of kits (like the one linked above) for these bikes.
-is modding the airbox and replacing the stock filter worthwhile while i have the tank and everything off?
For infos sake im located in south jersey and to the best of my knowledge the bike has been un-bastardized and bone stock before i installed the exhaust.
ive got a '98 that i just installed Danmoto gp slip on's on, like 2 days ago. Now, i have a Dynojet kit in the mail to arrive this monday. My local shop wants an obscene amount of money to install it, but since i'm an aircraft mechanic by trade, i figured the headache would be worth the pennies saved by doing it myself.
Now i have never worked with carbureted machines in the past, but i understand the general principle and have watched a couple videos of people tearing these things apart. And its my understanding (correct me if i'm wrong), unlike a lot of the 4cyl bikes, a jet is basically required with these bikes after exhaust work since they run so lean.
My questions are:
-Should i worry about getting a dyno run in before and after
-is installing the kit, as is, as-per Dynokit's instructions sufficient? or will i have to play with the pilot jet some more
-what general settings would you recommend for an aftermarket exhaust similar to the one linked above?
-are there any little nuances or tips for removing the carbs on these bikes (except the obvious)
-what is the general opinion of kits (like the one linked above) for these bikes.
-is modding the airbox and replacing the stock filter worthwhile while i have the tank and everything off?
For infos sake im located in south jersey and to the best of my knowledge the bike has been un-bastardized and bone stock before i installed the exhaust.
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MotoGP
Joined: Jul 2007
Posts: 5,213
From: Gettysburg, Pa
VTR virgin
Superstock
Joined: Mar 2015
Posts: 447
From: Auckland, New Zealand
I have gutted stock silencers (just a large bore perforated tube down the middle with packing outside that) and stock jetting on mine. Based on the plug appearance, this is just fine, and it runs well too. So before leaping into jetting land, why not check how your bike runs with the stock carbs?
If you do start to change the carbs, good scientific methodology would be to make a single change at a time.
If you do start to change the carbs, good scientific methodology would be to make a single change at a time.
Thread Starter
Junior Member
Squid
Joined: Mar 2018
Posts: 3
I have gutted stock silencers (just a large bore perforated tube down the middle with packing outside that) and stock jetting on mine. Based on the plug appearance, this is just fine, and it runs well too. So before leaping into jetting land, why not check how your bike runs with the stock carbs?
If you do start to change the carbs, good scientific methodology would be to make a single change at a time.
If you do start to change the carbs, good scientific methodology would be to make a single change at a time.
That being said I rode the bike lightly today and it didn't feel bad, but I don't really trust my judgement in that regard being that I don't think I would really know the difference. The only thing I noticed was some light popping when rolling off the throttle in all rev ranges.
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MotoGP
Joined: Aug 2007
Posts: 5,942
From: Lake View Terrace, CA
The bike will let you know by popping, banging and surging long before you go lean enough to cause damage.
Also one of the most common jetting "mistakes" on a VTR, IMHO, is going too rich.
So you will have no problems running the bike with slip-ons to see what, if any, jetting changes are needed.
Also as food for thought, I am running a bunch of bits on my engine including one of the better full exhaust systems and am running smaller than stock main jets.......
Thread Starter
Junior Member
Squid
Joined: Mar 2018
Posts: 3
I have gutted stock silencers (just a large bore perforated tube down the middle with packing outside that) and stock jetting on mine. Based on the plug appearance, this is just fine, and it runs well too. So before leaping into jetting land, why not check how your bike runs with the stock carbs?
If you do start to change the carbs, good scientific methodology would be to make a single change at a time.
If you do start to change the carbs, good scientific methodology would be to make a single change at a time.
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