M90 question

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Gramps · #1 Post by **Gramps** » Sat May 23, 2009 5:15 pm

I just purchased a brand new suzuki M90, I have put 250 kilometers on it, my question is when I short shift first into second then accelerate quickly( 1/3 throttle) it sounds like a rod bearing has gone, lots of knocking, I pretty sure it's not pinging, then once the rpm climbs (not sure of the rpm, no tach) the motor sounds fine. Hopefully there is nothing wrong as I love this bike. Any help would be appreciated

#2 Post by **blues2cruise** » Sun May 24, 2009 4:58 am

First of all...... :happybikeday:

Are your rpms too low to upshift? Is it lugging you hear?

Since it is still so new, ask the dealer about it....

BuzZz · #3 Post by **BuzZz** » Sun May 24, 2009 10:25 am

I'm with Blues, it sounds like it could well be the knocking you sometimes get when lugging a motor.

She also has a good point about checking with the dealership when you get a chance. It doesn't sound serious, but it won't hurt to have someone check it out in person

Gramps · #4 Post by **Gramps** » Sun May 24, 2009 2:58 pm

Thanks people, I also thought perhaps I was lugging the motor,however the knocking continues for at least another 1000 rpm (estimate) the dealer rode it and said it was fine, maybe I need louder pipes?

BuzZz · #5 Post by **BuzZz** » Sun May 24, 2009 3:46 pm

You might try running premium fuel if you are not now, just to see if the added octane helps or not. If you already are... disregard....

#6 Post by **dr_bar** » Mon May 25, 2009 12:20 pm

My suggestion would be to "NOT" short shift the bike. Your manual will have suggested speeds for up and down shifting. Another idea would be to make a tach one of your priorities as an accessory.

Gramps · #7 Post by **Gramps** » Tue May 26, 2009 2:31 pm

Thanks people, I have run a tank of premium gas through the motor, no difference, the manual suggests I shift up from 1st to 2nd at 20km, 2nd to 3rd at 30km, 3rd to 4th at 40km and 4th to 5th at 50km, I shift around 10km higher in all gears. It knocks until the motor smooths out. When I accellerate slowly no knocking( I know don't accellerate so hard) I hate to think what is going to happen once the motors run in and I get to give it some welly, (sorry I'm Welsh, common term for thrashing it) Hopefully I will have got that crotch rocket attitude out of my system by then, and yes dr_bar a tach is a priority for me, thank you.

#8 Post by **Wrider** » Tue May 26, 2009 4:20 pm

Honestly the suggested shift speeds on most bikes I've seen are WAY too low for the motors to be happy. That's for maximum fuel efficiency and making sure a valve will never be broken.

On my Suzuki Volusia 800 the suggested speeds were about the same.
I ended up shifting usually at about
1st - 2nd - 20 (24 kph)
2nd - 3rd - 35 (56 kph)
3rd - 4th - 50 (80 kph)
4th - 5th was pretty tall so usually about 65 or 70. (105-115 kph)

And those speeds were if I was just cruising. If I was on it I usually wouldn't shift until about 1.5 times those speeds.

Ya know if I decide to go with kph I can tell people I've been over 200... haha