Suzuki 2 Strokes

ok I 1st wanted to know , how long after you put new plugs in should you check them ? another words after around how many miles is a good time to pull and inspect? 2nd question is , I have bigger jets but now im considering putting the stock aircleaner back on, i bought the bike with pods on it, I have never ran it with the stock box, but im missing the boots that go inbetween the aircleaner and carbs so I would have to order them( they are expensive!) so Im not sure what direction I should go? I can either put the bigger jets in and keep pods or buy boots and possibly have to get smaller jets to put the original cleaner on? is the stock cleaner better? I have seen most gt750s with pods and very few with stock cleaner.... also I keep looking at the new triumph bonneville and thruxton, i dont know why, and not that I have the money for one, but does anyone have one? and as far as power and speed how do they compare to a gt750? I know they are 900cc but I dont think they have that much power according to the specs......

Have an 09 Bonneville SE.

Have seen a number of bike magazine reviews.
Cycle magazine tested the GT750M & got 13.296 sec quarter mile.
Cycle World test of the Bonneville says the bike does 13.24 sec in the quarter mile & has a top speed of 115 mph.
http://www.cycleworld.com/2010/09/16/ha ... ison-test/

I don't push my vintage Suzukis very hard. But if you are happy with the stock GT750 performance, then I would expect you to be happy with the Bonneville as well.

Qualitative thoughts:
The stock seat on the SE is awful, but Triumph has a selection of good replacement seats.
Bonneville is easier to deal with if you are short.
GT750 is a more comfortable touring bike.
Bonneville has useful power -- you don't have to spin it up like some sport bikes.
Has been reliable like you would expect modern bikes to be.

Am happy with mine & would recommend it if it fits your needs.

Thanks for the info on the triumphs, I dont push the gt750 that hard either, just once in a while Ill let her eat,,, I really like the look of the triumph and the fact that its new technology is great, (i had old triumphs) actually I had 1 old triumph and I could not get used to shifting with the right foot, not to mention leaks and tunning, but it was still a good bike and I have always liked them. I have not ridden a new triumph and I noticed the horsepower was about the same as the gt750 so I was wondering how they compared. I like the fact that the new ones are fuel injected, I have never had a injected bike, always old bikes, and I have never bought a new bike but i seem to restore them to new, what the hell I getting older so maybe I should get 1 new bike, I only ride around town for now so the bonny would be perfect. I would not get rid of the gt750 though and theres nothing like riding a real vintage bike, when I ride the superhawk people think its triumph or norton untill they see the honda logo......plus I just recently rode an old bsa and it was pretty cool, I had a chance to buy a matchless years ago and I passed it up, wish I would have bought it back then!!! now they want double the price!!!! thanks for the info if a used bonny comes my way I would like to get one, but the wife will divorce me and the gt750 needs to be finished 1st..

As far as plug inspection goes. Your oil pump setting is one of the largest factors how often one should inspect the plugs. With modern 2 stoke oil if you have the pump set at factory settings or even a good portion below it fouls the plugs with oil at a very fast rate. Therefore, you would have to inspect and clean them that much sooner. One of many reasons I like to adjust the setting much lower. Of course jetting, intake, exhaust and how one rides are also other factors. With these bikes it's impossible to estimate a mileage number for everyone because of those variables. You have to make that estimate on your own. Depending how your bike is tuned and how you ride. I know I have to clean mine every four to five rides or a cylinder will not fire due to oil foul. And my pump is turned down pretty far. I like it set where the bike smokes the least. But, smokes. If you go back to stock air box, you'll have to go with stock jets. Unless you have an aftermarket exhaust. Then you would most likely need to play with the jetting size. Your plugs will tell an accurate story on which direction you need to take the jets and set the oil pump. Regardless of which filter you choose.

Thanks for the info, right now I have stock jets with the pods and it seems to be slightly lean, I have put around 100 miles on it and the plugs are a tan color, but kinda light tan, I put colder plugs and I have put around 30 miles on it and the plugs have tan and white color soil pretty sure the bike is lean. I have larger jets but I have not put them in, i don't think I have ever worried about plugs and a lean issue like I have with this, it's because this is my first gt750 and I have put so much work into it I would hate to burn a hole in a piston, but the plugs aren't that bad , I don't think...

pearljam724 wrote:As far as plug inspection goes. Your oil pump setting is one of the largest factors how often one should inspect the plugs. With modern 2 stoke oil if you have the pump set at factory settings or even a good portion below it fouls the plugs with oil at a very fast rate.

Really? I have my pump set to the factory setting and I use a modern semi-synth oil and I have never fouled a plug on my GT, ever.

Therefore, you would have to inspect and clean them that much sooner. One of many reasons I like to adjust the setting much lower. Of course jetting, intake, exhaust and how one rides are also other factors. With these bikes it's impossible to estimate a mileage number for everyone because of those variables. You have to make that estimate on your own. Depending how your bike is tuned and how you ride. I know I have to clean mine every four to five rides or a cylinder will not fire due to oil foul. And my pump is turned down pretty far.

Something else is wrong if you have to clean your plugs every five rides. The stock plug, oil pump, jetting and airbox parameters will not result in fouled plugs.
I have neither cleaned nor changed the plugs in my bike more than three times in the last 30,000 km - a well-tuned and well-running GT is NOT a prodigious plug-fouler.
In fact, my four-stroke bikes go through plugs quicker than my GT.

I like it set where the bike smokes the least. But, smokes. If you go back to stock air box, you'll have to go with stock jets. Unless you have an aftermarket exhaust. Then you would most likely need to play with the jetting size. Your plugs will tell an accurate story on which direction you need to take the jets and set the oil pump. Regardless of which filter you choose.

I would adjust your oil pump settings leaner than stock at your peril.

Teazer (I think?) has done some analysis on the actual amount of oil the pump provides at the stock settings.
The secondary pump stage, i.e. the oil ratio supplied to the crank bearings, is already quite low (but obviously adequate) at the stock setting - the equivalent of something like 100:1.
As the much higher ratio of oil that's pumped into the intake ports (the primary stage) never reaches the crank bearings, I doubt it's prudent to be knocking that setting too far back...

It always amuses me how some people think they know better about how their bike should be tuned than the manufacturers who invest many hours and dollars into making their machinery as reliable as reasonably possible, and then wonder why the poor bloody thing destroys itself or doesn't perform or last as long as it should.

It amazes me that someone hasn't the common sense that if your pump is turned down and someone (me) rides regularly at higher constant highway speeds the pump is where it needs to be and higher. If you want to follow an analysis of a setting by a manufacturer that was deemed by a thicker oil 40 years ago by all means impress yourself.

pearljam wrote:As far as plug inspection goes. Your oil pump setting is one of the largest factors how often one should inspect the plugs. With modern 2 stoke oil if you have the pump set at factory settings or even a good portion below it fouls the plugs with oil at a very fast rate.

Totally agree with PJM, if anything, modern semi synthetic two stroke oils burn cleaner and lubricate better than the old dino oils. There is no need to change the factory setting for the oil pump to compensate for a plug fouling problem, you should be looking elsewhere to fix the fouling problem. Why would you risk your motor by not giving it enough two stroke oil?

sorry guys didnt mean to start anything but my bike is on the lean side and the pump is set at factory postion. I went ahead and ordered the stuff I need for the original air cleaner, it was expensive but I will not have to order it in the future, Im going to see how she acts with the box on it compared to the pods. I might be rich after putting the box on but not sure yet. I run bell-ray si-7 and it runs good, so far. I have a kinda orange color on the plugs and maybe its the oil being burned? who knows as long as i dont need a tear down im happy///

You didn't start anything here, some of us are just trying to keep you from going down the wrong path, if you're using a good grade of two stroke oil and using factory setting for the pump you should be OK with that. You are on the right track with the jetting and the carbs. Plugs should have a nice tan colour to them if everything is set right. I'm going to start a separate topic on oil pump settings so that those who want to continue that discussion there can do so and leave your post to focus on the jetting. Sometimes we do have a tendency to get off topic.


Cheers....Fred

I dont mind getting off topic, no prob with me, also I tried ordering the pilot jets and I cant find any available, where do you guys get yours through?

Eddie wrote:I dont mind getting off topic, no prob with me, also I tried ordering the pilot jets and I cant find any available, where do you guys get yours through?

Type in Mikuni main jet size you prefer on Ebay. They are listed. I bought some directly through a Mikuni dealer. Cheaper that way. They can also verify that you need small or large round. Which I can't remember myself. You're lean because of the pods and stock jetting. You're getting more air than fuel. I can't quite recall because it's been so long. I believe I called JetsRUs. If you give me until late tomorrow evening. I will look at my package that I still have to verify for sure exactly what you need. Or give them a call. Scroll down on the left and the sizes you want to bump the main up to will be listed. http://www.jetsrus.com/a_jets_by_carbur ... _round.htm" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;

Pilot jets still show available at Alpha Sports:

http://www.alpha-sports.com/suzuki_parts.htm" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;

I've been able to get both Pilot and Main Jets for my T500 at Dennis Kirk for a decent price ($6/pair) with reasonable shipping.

Don't know the part numbers you need for a GT750. To find the right parts for my carbs, I cross referenced a Sudco catalog, and searched on the Mikuni part numbers.

The info you are looking for is available at http://pinkpossum.com/GT750/carb/BS40carbs.htm" onclick="window.open(this.href);return false;

You must get the right jets. The wrong ones look very similar but do not flow the same.