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Is the 220 a particulary thirsty machine? Mine seems to drink a lot, I don't have a speedo, but think I'm getting less than 5kms to the liter, even on really open tracks.

I know little about jetting, but my mechanic is considered v good, he's adjusted it without noticeable improvement.

The cylinder has been ported and is engraved. From what I've read, this doesn't always help performance and can increase fuel consumption.

Altough I haven't given detailed info, can anyone advise whether i should focus on jetting or would replacing the cylinder be the best course (I have a spare engine in better condition than the present one.)

5k/L?
is you bike peeing a LOT
adjust your float

I haven't noticed fuel coming from the overflow. If the problem was that simple it probably would have been solved by now, as the previuos two owners have sold due to poor mileage.

The cylinder has been ported and is engraved. From what I've read, this doesn't always help performance and can increase fuel consumption.

Where did you red something stupid like that?

zomby woof wrote:

The cylinder has been ported and is engraved. From what I've read, this doesn't always help performance and can increase fuel consumption.

Where did you red something stupid like that?

By searching this forum.

99sr220 wrote:I haven't noticed fuel coming from the overflow.

But have you been looking for it?

I would think overflow too... Porting and such will increase consumption to a point... but it can only use so much fuel...

i will pay close attention, it just seems if it were so simple the previous owners would have picked it.

Indawoods wrote:I would think overflow too... Porting and such will increase consumption to a point... but it can only use so much fuel...

After a thorough check I've eliminated overflow as the problem. In another thread porting is discussed, someone mentions having their RD done and says 'Fuel efficiency took a huge hit,' (here's the thread http://kdxrider.net/forums/viewtopic.ph ... 6&start=20)

I'm wondering if maybe there's a combination of factors:
- Porting
- Jetting
- Not having an speedo to check the actual mileage

Saturday's ride was a lot of tight tracks up and down hill.

This weekend will be a race over a measured distance, so will give me a chance to accurately know what I am getting.

Curious, what size main jet and pilot jet are you running? Also, did you attach a small catch can or anything on the overflow and then ride it to rule it out? No leaks or fuel coming from the tank, gas cap, gas tank vent anywhere?

I didn't attach a can, but stopped periodically and the hose was dry each time. No leaks coming from anywhere.

The jetting is being done by my mechanic, I'm nor sure of the main jet but know he switched the pilot down to a 38 which has pretty much stopped the spooge I was getting.

MPG figures don't really mean much, considering the variety of terrain. The best way would be to measure against another 220, but over here they are all SR versions.

I know the bike uses more than a YZ250, which to me seems strange.

I know the bike uses more than a YZ250, which to me seems strange.

Yes

Over the weekend went for rode 103kms and used approx. 12 litres. This works out at 8.3kms per liter or 17mpg.

The bike runs fine on the pipe, but is 'blubbery' cruising down a straight rode.

Any tips?

you need to lean the needle.

I've never really tried to accurately measure my mpg.

When getting in shape for the seasons Enduros I keep a log of mileage and time. I think I'm getting 20 mpg, more or less.

The type of riding is going to make a big difference. The type of riding I'm talking about here is 20 miles of very tight ST, seldom out of third, and it takes 1.5 hours. A good workout. I'll definately burn a gallon.

I think I got better mileage before the RBD head and carb mod when I had a properly jetted stock 220 motor.

Mine is also "Blubbery" down a straight road, when cruising with minimal load. I consider that normal.

This past summer I had a HS race where I checked my gas use after the race. It was very tight technical, rocky, never out of 3rd gear. I used roughly 1 quart per 6 mile lap. There are roughly 4 liters to a gallon. By my math you are getting only 20 KILOMETERS to the gallon, or about 12 MILES to the gallon. That seems pretty bad. something is not right.

If I rat bag the **** outta my bike, I can get about 85km until I hit reserve, I've gotten 120km just cruising on fire roads before. That's with porting, pipes, rb'd and properly jetted for 4000' and the stock trip meter.

I think I get anywhere from 11 - 22 mpg, depending on terrain

KarlP wrote:I've never really tried to accurately measure my mpg.

When getting in shape for the seasons Enduros I keep a log of mileage and time. I think I'm getting 20 mpg, more or less.

The type of riding is going to make a big difference. The type of riding I'm talking about here is 20 miles of very tight ST, seldom out of third, and it takes 1.5 hours. A good workout. I'll definitely burn a gallon.

I think I got better mileage before the RBD head and carb mod when I had a properly jetted stock 220 motor.

Mine is also "Blubbery" down a straight road, when cruising with minimal load. I consider that normal.

I spend a considerable amount of time playing with the jetting on my 200
and the blubbery you guys talk about is normal in my opinion on a flat
out cruse, steady throttle.
You can clean that up by lowering the needle or going to a smaller pilot however you will then get a bog when you try to light her up.
I'll take the blubbery..........

I have a 200 but getting 120-150 km then onto reserve.

Yours seems to be a thirsty bugger....