Suzuki 2 Strokes

Oh Crap, Just when I think I've got the 380 running smoothly I return home today from a good 100 mile ride and the soddin thing is idling at 2000 rpm, then dropping to the point where it just dies. Everything was ok when I set off though, she was ticking over at a steady 1500 rpm. Just gave it the quick once over and noticed 2 of the 3 carb intake boots are split. That will be the cheapo set I bought from Cruzin Image then. To be fair they have lasted all of the 1,200 miles I've done since I rebuilt it. I don't think they can take the heating up and then cooling down again as they are very soft when warm then rock hard when cold. Any how just ordered a genuine Suzuki set from Discount Bike Spares along with all the original clamps. So carbs off again.

Just as a matter of interest has anyone ever used a smear of silicone in the intake rubbers to help seal them or is this a bad idea. Also the rubbers have a protruding bit with a slot in on one face, does this go on the top or bottom when fitting as I'm not sure what they are for. My parts catalogue show them as plain.

I think that slot is to align with a tab on the carbs to ensure they're 'upright'
(Or maybe I'm thinking of my RZ!)

joolstacho wrote:I think that slot is to align with a tab on the carbs to ensure they're 'upright'
(Or maybe I'm thinking of my RZ!)

Think you may be thinking of your RZ "joolstacho". The 380 carbs are in a bank of 3 and are fixed in the upright position.

I had a 550 J shop manual. That notch is shown on the engine side, upright. However I just got new rubbers from Suzuki and there is no notch That makes me think that the notch was a pointless alignment trick on really early bikes. Personally I have never seen any rubbers with a external notch. I don't think it matters at all.
I just looked at the75' 380 fiche on Alpha Sports. It shows that notch and it is shown upright. It's under 'Air Cleaner".
If you decide to scrap the CI boots for real ones, Partzilla has them for $13.22 each. Part # 13111-33100.
I don't know about CI anything. I bought their brake line. Sure is pretty. Sure does leak. The sealing seat on one of the lines is way off center.. Not the seat but the 'cone' that fits in the seat. It's in the POS stack.

Coyote wrote:I had a 550 J shop manual. That notch is shown on the engine side, upright. However I just got new rubbers from Suzuki and there is no notch That makes me think that the notch was a pointless alignment trick on really early bikes. Personally I have never seen any rubbers with a external notch. I don't think it matters at all.
I just looked at the75' 380 fiche on Alpha Sports. It shows that notch and it is shown upright. It's under 'Air Cleaner".
If you decide to scrap the CI boots for real ones, Partzilla has them for $13.22 each. Part # 13111-33100.
I don't know about CI anything. I bought their brake line. Sure is pretty. Sure does leak. The sealing seat on one of the lines is way off center.. Not the seat but the 'cone' that fits in the seat. It's in the POS stack.

Received the new boots yesterday and they are original Suzuki parts in original packages. They were £13 each and they too have the groove on them on the carb side end face so I fitted them with the groove up and all seems to be ok. Hope they last longer than the crappy CI ones. Perhaps I over tightened the last set but maybe that's just me trying to justify why they split.

Hope all goes well with yours but there is an argument that original Suzuki rubber parts(you can tell NOS because no barcode on packet) is maybe 40 years old and you are actually better to buy remanufactured new rubber ones. I know I had a NOS boot split after a week. The new rubber is of course more flexible.

I have a set of Cruise's boots on my 77 GT 750.7500 miles later they are still good.

I bought CI's fork tubes for my GT750....so far so good. They aren't rusting.....of course, I haven't ridden it much.



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