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Ive been trying to remedy this problem for over a year now.
My bike is my dominant mode of transport, not just a hobby, so to have it act up like this makes things alot more difficult.
Ok so heres the bike:
1988 Stock Suzuki GS450
Regular oil changes, 75% rebuilt carb (only the diaphragms and related assembly, needles and slides, werent replaced)
The Problem:
When I got the bike it didnt run. I cleaned the carbs out really well and that got her going. As time went on, I started to notice that the RPMs would stay elevated after acceleration or throttling in Neutral. I figured i was sucking in some air somewhere so i did a refresh on the carbs and replaced about 75% of the parts leaving only the diaphragms and related parts original (they seemed fine and were very expensive to replace.) After this, the bike ran the same as it did before. More time goes on (6-8 months) and now the problem is so bad that between shifts, the bikes RPMs will actually rise to about 5k (tach broke a few months back, but i can tell its not redlining but its definently not sinking either) and when I come to a stop, I have to make sure i leave it in gear until the RPMs drop to under 2000, and then it will idle without shooting back up.
That basically sums up the problem, if the REVs go above 2kish then it shoots up to 5-6kish when not in gear (or with the clutch in)
Like I said, i thought it was excess air for a while until i found out that the "choke" on the bike is actually a fuel enricher and noticed fuel condensing in the vacuum lines. Also, I shot carb cleaner around the carbs in all different places, and no surges developed from that. My carb boots were replaced not long before I got the bike, and look in fine order.
Other symptoms include, but are not limited to:
1. Very hard to start in the cold
2. When the "choke" is on, after the engine starts to warm up, the RPMs shoot way up(this happened ever since i had the bike and what had led me to believe it was an air problem, not a fuel problem)
3. If the bike revs up right before I shut her off (coming in to a parking space or something, and not bothering to attempt to get the RPMs down since im parking anyways) she'll backfire(another reason i figure its excess fuel)
4. Seems to be eating alot more fuel. when i first got the bike, it would do between 42-50mpg. Now its getting 35-40mpg... horrible for a old jap bike as far as i know.
Its very annoying when coming to a stop light, and having to let the clutch out to make the RPMs drop enough to keep it under 2k to get it to idle revs.
That about sums up the problem, any help would be GREATLY appreciated.
Thanks
My bike is my dominant mode of transport, not just a hobby, so to have it act up like this makes things alot more difficult.
Ok so heres the bike:
1988 Stock Suzuki GS450
Regular oil changes, 75% rebuilt carb (only the diaphragms and related assembly, needles and slides, werent replaced)
The Problem:
When I got the bike it didnt run. I cleaned the carbs out really well and that got her going. As time went on, I started to notice that the RPMs would stay elevated after acceleration or throttling in Neutral. I figured i was sucking in some air somewhere so i did a refresh on the carbs and replaced about 75% of the parts leaving only the diaphragms and related parts original (they seemed fine and were very expensive to replace.) After this, the bike ran the same as it did before. More time goes on (6-8 months) and now the problem is so bad that between shifts, the bikes RPMs will actually rise to about 5k (tach broke a few months back, but i can tell its not redlining but its definently not sinking either) and when I come to a stop, I have to make sure i leave it in gear until the RPMs drop to under 2000, and then it will idle without shooting back up.
That basically sums up the problem, if the REVs go above 2kish then it shoots up to 5-6kish when not in gear (or with the clutch in)
Like I said, i thought it was excess air for a while until i found out that the "choke" on the bike is actually a fuel enricher and noticed fuel condensing in the vacuum lines. Also, I shot carb cleaner around the carbs in all different places, and no surges developed from that. My carb boots were replaced not long before I got the bike, and look in fine order.
Other symptoms include, but are not limited to:
1. Very hard to start in the cold
2. When the "choke" is on, after the engine starts to warm up, the RPMs shoot way up(this happened ever since i had the bike and what had led me to believe it was an air problem, not a fuel problem)
3. If the bike revs up right before I shut her off (coming in to a parking space or something, and not bothering to attempt to get the RPMs down since im parking anyways) she'll backfire(another reason i figure its excess fuel)
4. Seems to be eating alot more fuel. when i first got the bike, it would do between 42-50mpg. Now its getting 35-40mpg... horrible for a old jap bike as far as i know.
Its very annoying when coming to a stop light, and having to let the clutch out to make the RPMs drop enough to keep it under 2k to get it to idle revs.
That about sums up the problem, any help would be GREATLY appreciated.
Thanks
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