Sunday, January 25, 2015

Motorcycle Mass and the new CCM GP450

So, there is a new British adventure motorcycle, just starting production for Europe, and hopefully coming to the US someday.  The company is CCM for Clews Competition Motorcycles and, since they came out of motocross, they emphasize light weight.  I think they have a great idea and I truely hope that they can make it to the US market.

Most of the pictures here come from a review article by Nathan on Adventure Bike Rider.  Here is the link to their review.

What do I mean by a light weight motorcycle?  Their GP450 Adventure is claimed to have a weight of just over 300 pounds full of fuel.  And this isn't some small motocross fuel tank but a reasonable 4.5 US gallons which should give 225 mile range at 50 mpg.  50 mpg is what I get out of my KLR, as long as I stay off the slab.  The CCM has a more modern, fuel injected engine of equal horsepower but lower displacement.  I'm guessing that it will get better fuel economy than the KLR and very acceptable range on a tank of fuel.

What's the advantage of light weight?  To me, lighter weight makes everything better.  Acceleration, braking, cornering, all improved.  My ability to get the motorcycle to respond quickly, improved.  Fuel economy, improved.  Overall, I would rather have a lighter bike than one with more horsepower.

Among all the rest of the reasons, the GP450 is a nice looking bike with premium components and a size that fits even me (at least according to

The GP450's light weight got me to thinking.  How light are other motorcycles that I either like or have tried (and fit?)?  What is their weight and how is their weight/power ratio as an indicator of acceleration performance?  Now my trusty old KLR is a bike that I have ridden for over 10 years.  It has enough power for me and is a good fit.  Anything on this list that improves on it's weight or weight/power ratio is going to be just fine.

The KTM 640 LC4 Adventure is an old bike in the Rally Raid style with excellent fuel range.  I have always found KTM bikes to be lighter than most.  The KTM Duke 690 is basically a hooligan thumper.  The KTM Duke 390 is new for 2015 and is a lighter, short range bike like it's bigger brother, the 690.  As you can see, the 640 Adventure, the new Duke 390, and the CCM are all about 12 pounds/HP with a 200 # rider.  In contrast, the Duke 690 and the Tiger 800 are faster than I need.  All of them are faster than the good old KLR.  If you are looking for a reference point, a BMW 328i has a "pounds per HP" of just over 15, so all of these are faster than a pretty good car, including the KLR.

Looking at weight including a full tank of fuel, the KLR on the bottom is my baseline.  At 375 pound with fuel and a theoretical 300 mile range, it's not doing too badly.  In comparison, the CCM GP450 weighs 75 pounds less and still has an acceptable 225 mile range in this comparison.  Now, I admit, I wouldn't want to go too much lower in fuel range, but the GP450 is just fine.  

The 640 LC4 Adventure is a nice older bike, comparable bike to my KLR.  It's power and weight aren't that different, but it does carry a massive 7.5 gallons of fuel and a 375 mile range to go with it.

The Duke 390 is pretty interesting.  A very modern 373 cc engine with excellent horsepower for it's size and a light 320 pounds with fuel.  It only has two issues.  The frame is too small for me (It might be possible with enough modification) and the fuel range is too small.

From a weight point of view, the Duke 690 is really very good, but it's fuel range is tiny.

That leaves the Tiger 800 and it is one nice bike, but it is also so heavy.  I don't understand why a bike that is the same size as the KLR has to weigh almost 500 pounds.  With lots of modern electronics, the Tiger (especially the 2015 XCx model) would be my long trip bike of choice, but I have a hard time getting past the price and the weight.

Anyway, I think my bank account is safe for now.  The CCM will take a while, if ever, to reach these shores.  The Duke 390 is too small for me and the Tiger too pricey and fat.  Still, I am happy to see these interesting new bikes come to market.  It has certainly stirred my interest, although I'll keep plugging along with the KLR for now.

Friday, January 2, 2015

Behind Again

Sometimes, doing the right thing just means more projects and me further behind.

I'm a big believer in being visible when riding a motorcycle on the road.  With so many things distracting drivers today, you've got to grab their attention so you don't get run over.  The tallest thing on the motorcycle is your helmet, so a strong, bright, high contrast color on a helmet gets the driver's attention from farther away than any other part of the motorcycle.  That's why I have taken the time to paint my helmets.

A helmet is designed to give you good protection for 5 years, 6 years in a pinch.  After that, the styrofoam liner has shrunk a little and the distance from your head and the liner increases your risk in an accident.

I have really enjoyed my Shoei X11, but 2014 was the 5th year and it was time to get a new helmet.  This last summer, I managed to find one that fits but somehow haven't gotten time to paint it.  At least I got a start on masking it.  In case you are wondering, I learned the hard way that you don't want to paint the vents.  Those things have switches that need to function and get clogged up with paint.  It makes finding a pleasing graphic pattern a challenge.

Wouldn't it be nice if I could buy one in the high visibility color?  They do exist, but my big, fat head has made it hard to find one that fits and meets my other needs.

It seems like the faster I go, the behinder I get.

Catching Up in the New Year

I know, I haven't posted in too long.  Since it's the new year, I thought I would catch up a bit.

I've ridden the 2001 KLR650 for 11 years and it's been a good fit for me.  Alas, about 2 years ago, it decided that it was a little bit British and started to leak oil.  I looked and looked and tried several approaches to fix what I thought was the leak.  I replaced output shaft seals, oil drain plug washers, anything and everything near the leak.  Finally, I found it.  There is a crack in the crankcase, running vertically through the treads of the oil drain.  #*!##**!

After much hemming and hawing, I decided that the only right way to fix this was to replace the crankcase with a good used one.  Rebuilding with a new part would have cost more than half the value of the bike, so used was the way to go.

Of course, at 35k miles, I would need to hone the cylinder at least and probably need to bore it and up the size of the piston and rings.  I guess you could say that I got a case of the "might as wells".

The lovely piston in the pictures is an aftermarket forged piston that reduces the mass by 25% and is said to significantly improve the vibration of the engine.  In addition, it bumps the displacement from 650 to 685 cc with a 2 mm bore increase.  Smoother and more torque, might as well indeed.

In case the piston looks a lot like a car piston, you would be correct.  The piston diameter is slightly more than 4".  Now you know why they call them thumpers.

Looks like I'm behind on projects again.  Combine that with travel for work and I better get busy.