Finally Done!

[pmarinello]

Well guys I finally finished rebuilding the entire quad, ran it today, bogging a bit down low but once it revs up its a beast. NOW THE PROBLEM (of course), why does it bog down low?

Info:
2000 Blaster
Aftermarket pipe
no airbox lid
360 main jet DYNOJET KIT

 

[blasterdude14]

i think your main jet is way to big that would be the most likely problem

 

[pmarinello]

the dynojet jets are not the same sizes as real jets. I don't think its REALLY a 360. but all i have is the stock jet. and that one dynojet... will it hurt my engine running the stock one? will it hurt my engine running the larger one, until i can go and get a jet kit? This is also the break in period for the engine.

 

[blasterdude14]

running the stock one will make you run lean which would cause a meltdown so i dont reccomend that. its better to run rich than lean. so use the larger one until you buy some new jets and dont buy a jet kit just buy individual jets main jets cost about 2 to 3 each.

 

[Blasterdude27]

Dynojets are crap.

You shoud be running a 270-300 main, what pipe?

 

[pmarinello]

fmf fatty w/ a pro circuit 304 factory sound silencer. So when I go to the dealer in a few minutes, what size jets should I pickup?

 

[burnin'_oil_2001]

I would try to richen your pilot by one size and see what happens. The main jet is for 5/8 to wot....

link to the entire article below----http://forums.pstuning.com/index.php?showtopic=545

.....Please remember that we tune each of the carburetor circuits based on throttle position and not RPM. We also go from the bottom to the top, because to varying degrees there is a culmination/overlap of mixtures from one circuit/position to the next one. If these overlaps were not present and correctly tuned for… you would experience flat spots or bogs and/or surges as you open the throttle.
Idle to about ¼ throttle opening is primarily controlled by the pilot circuit and this fuel/airflow continues all the way to WOT… and thus affects the whole jetting spectrum. This is one of the major reasons that you jet from the bottom to the top.

1/8 to about 3/8 is controlled by the slide valve cut away.
¼ to about ¾ is controlled by the needle jet and jet needle.
5/8 to WOT is controlled by the main jet.
Note how each circuit overlaps!

An important point to note is that if a particular circuit is either too rich or too lean… the amount of overlap can shift up/down, shrink/expand the range that it should normally control. Due to an engines design characteristics, rider driving technique and a multitude of other variables… a particular circuit may need to be richer/leaner than it would be in a different situation. Then an adjustment would have to be made on either side to make the transition smooth.....

I hope that this helps.

 

[blasterdude14]

260 270 and 280 would be good to try

 

[ajblaster]

14 need sum rep

 

[burnin'_oil_2001]

Well guys I finally finished rebuilding the entire quad, ran it today, bogging a bit down low but once it revs up its a beast. NOW THE PROBLEM (of course), why does it bog down low?

Info:
2000 Blaster
Aftermarket pipe
no airbox lid
360 main jet DYNOJET KIT

is it like a lean bog or a an over fuel bog? how far open is the throttle when it is bogging? and do you have a smaller dyno jet main to try? i would agree that if you were using mikuni jets that you would most likely need between a 270-290 but my guess is that you either have a mis-adjusted float or need a larger pilot. depending on where the bog and its type you may need to change the needle clip position. what I did was to up my pilot one size (two if it is the earlier pilot jet), lower my clip one position (richen), and used a 310main.

 

[foolish913]

with my fmf an stock carb i ran a 250

 

[Outlawed Genetics]

if your running the dynojet needle that needs to go too. worst kit i ever bought. get a stock needle and main jets from 250-280.

 

[Cmh156]

Try a 270 main and move the clip up one.

 

[pmarinello]

ok thanks for all the suggestions guys, I am going to go to the store tomorrow and grab some main jets and I have a stock needle that I never used from my rebuild kit. I'll tell you whats good sometime tomorrow.

 

[ajblaster]

wheres the pics

 

[ClimbAnyHill]

I jumped on the thread looking for rebuild pics LOL!!
But yeah dude.. sounds way too rich for a Blaster!

In all the Blasters I've checked out main jet landed between 270 & 300.. A 360 would be huge!
If you have a series of jets.. start working your way down, when close do a plug chop!

 

[xmous3yx]

if your running the dynojet needle that needs to go too. worst kit i ever bought. get a stock needle and main jets from 250-280.

y is the dynojet needle bad?

 

[xmous3yx]

if your running the dynojet needle that needs to go too. worst kit i ever bought. get a stock needle and main jets from 250-280.

y is the dynojet needle bad?

 

[xmous3yx]

how the hell did i manage to double post? lmao

 

[burnin'_oil_2001]

y is the dynojet needle bad?

I do not think that they dyno jet kit or needle is bad...you just have to tune for the changes. I think that the aftermarket needles flow more fuel and people do not tune for the changes. The reason people do not like them imo is because they tune differently than the stock parts and therefore one gets a different result than with the stock set-up.