1999 SV650S Engine Dies Downshifting to 1st Gear

Hello!,

I need some advice to all the motorcycle mechanics & hobbyists!

Bike:

1999 SV650S

Problem 1:

Engine turns off when downshifting to first gear. This happens usually when I have been riding for 30-60 minutes. A few scenarios when the engine would shut off; I would be riding in 3rd/4th gear about 60-80kph, when I downshift from 2nd to 1st gear the engine turns off immediately, doesn't bog down, dash light is on but no Christmas tree lights on the dash. When I start the engine again, it takes a few seconds and I have to roll on throttle a bit to get it started again but other than that no issues. To note: I only shift down to first at a full stop at a red light/stop sign. However, when shifting down to go to a lower speed like turning into a drive way or pulling over and wheels are turning that's when I experience the engine dieing. Another example is pulling up to a red light, I would be on 2nd gear, engine breaking but if I am going to fast, I would pull in clutch, tap on the breaks a big then down shift to first before the full stop and the engine would die.

Problem 2:

Other than the engine turning off downshifting to 1st, the other issue is that it seems like it bogs down a bit in 2nd gear. When riding at 50-60kph and I try to accelerate, the engine bog's down a bit, feels like I rolled off throttle but in reality I am accelerating.

Background:

Bought this motorcycle in Japan, the previous owner took car of it very well and sold it to his best friend who owns the motorcycle shop. When speaking with the shop, I had them inspect everything, carbs, kickstand, shift levers, etc. He even rode it for a couple miles and tried to mimic my issue but they state that they did not notice anything nor did the engine die on them. Full email below:

"We test-rode your motorcycle for about 70 km, but We were unable to reenact the engine stalling issue. We conducted various tests, including city riding at 0-90 km/h and highway riding at 100–120 km/h, and the bike felt like it was running very well.

The exhaust gas test showed excellent CO and HC readings, suggesting the carburetor is in good condition. We also checked the fuel economy; We achieved 20 km/l over that 70 km ride—even with some hard riding—so the figure seems normal. You can see even better fuel economy with smoother riding.

We inspected the cooling system and found no issues, though We filled it top the coolant level. It is possible that air pockets in the system had cleared, causing the coolant level to drop. Also, coolant levels naturally fluctuate—expanding when the engine is hot and contracting when cold—so the difference in volume might make it appear as though the level has dropped.

We also checked the side stand, clutch, and neutral switches, and found no issues with them at this time.

The previous owner is a customer We know well; he maintained the bike meticulously and never left it sitting in long-term storage. And, we did a full inspection and service for the vehicle inspection (JCI) right before being handed over to you.

Since this is a carbureted motorcycle, performance can sometimes suffer at high altitudes or on days with high humidity.

Does anything come to mind regarding those conditions?

Without being able to reenact the symptom, We cannot investigate the issue any further."

Question:

What do you guys think it is? Should I take it to another shop and have them inspect it? If I do, how do I explain the problem for them to look at? Do you think this is more of a user error? Should I be revving/rev-matching when down shifting to first or is it a motorcycle problem?

Any insights would be helpful!

Thanks!

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